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IMPORTANT NOTE
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HOW TO USE THE COMMENTARY TO Z662-11
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Copyright © Canadian Standards Association — 2011. All rights reserved. No part of this publication may be
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





                 




              

             

                 




                    

                       




             


                    


                    
























































































 
 
 

























 





































































































 














 
 


 
 
 
 
 


 
 
 
 
 
 
 
 
 


 
 
 
 
 


 
 
 
 
 
 


 
 
 
 
 
 
 


 
 
 
 



 
 
 
 
 
 




 

 

 
 
 






























































 
  




 


 
 
 
 
 
 


 
 


 
 
 
 




 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 



































 
 
 
 
 
 
 








 
 
 
 
 
 


 


 
 
 
 
 


 

 
 


 
 
 
 
 
 
 


























































 
 
 
 
 


 
 
 
 
 
 
 
 
 
 
 




 
 
 
































 


 
 


 
 
 
 






 
 
 


 
 


 
 
 


 
 
 
 
 
 
 
 


 
 


 
 
 
 
 


 
 
 
 
 




























 
 
 
 
 
 
 
 

 

 
 
 
 
 
 
 
 
 
 
 
 






 



























 















 




































 







































































 
 
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





























































































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



 




































 
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





































































 


 



 






 

 
 
















 






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 



 
 









 
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


















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






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



















 

 











 














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




























 
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













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 

 
 

 









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 













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
 

 


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
















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
 
 

















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

 
 












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


 






























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




 

 




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















 

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








 

 
 


 


 
  

 

 

 


























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







  
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

 





















  

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













































 






  

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










 






 










 












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








 

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





















 




 






 

 
 
  
   
  
  
  

 


  
 
   

  

 




  
 
   

  
 
 



  



 




 








 





























 
 





 




 
 






 



 

 



 

 

 

 






 





 




















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






 













 









 





 















 




 







 


 


 






 
 






























 
 










 
















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











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























      









     
 
  





 

  




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

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
  


















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
























 


 




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









 




































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
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







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










































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
 









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

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

















 









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












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








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



















 



 









 











 
 





 







 






 










 
 











 
 






















 
 



 



















 




 







 




















 
 





 














 


 





 














 




 




 
 




















 
  










































 
 





  



 








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







 
 
 




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
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


  





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




 
 






 
 

 

 
 





• •••

 



 

 














 






 





 
 





 


 
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




 
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






 



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






















 






 


 
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











 






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 




 




 




























 
 


 
 








 







 




 
 
   

 
  
  

  
   
 
   
 


 





 
 
   










































































 

 



 


 

 















 







 





 



 

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












 



 









 
 









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












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



 
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



 

 
  

















 

 












 
 





 

 


 










 





 


 






















 












 
 











 













 






















 
 





 


 







 

 








 










 





 






 
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







 
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




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







 


 



 



 














 
 



 






 


 









 

 



 













 



 




 











 



 

 


 



 




 



 

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












 



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

































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


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
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
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
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
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
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






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









 





 
 


 







 












 












 
 



 




 



 

 



 




 












 








 


 





















 



 


















 




 
 



























 



 











 







 





 

 














 



 












 












 




 











 



 
















 
 










 

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












 











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
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



















 































 
 

































 
 



























 

















 








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




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










 








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



































 













 



 

 


















 








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








 
 







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








 

 
 



 



 

















 













 








 














 








 
 













 






 








 



 














 


 



 




 













 



 
 


 



 






 






 


 
 



 





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

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








 



 



 

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




 

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









 






 

 

 


 










 







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













 







 





















 


 
 
 
 
 
 




 









 




 






 

 
 







 



 




















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






 



















 


























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













 
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





 

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
















 






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
 
 










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



















 
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







 


 
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
 





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



















 
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











 


 

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

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










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









 





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 
 

















































































  
  
  
  
 
  
 
  
  
  
  
  
 
  
 
  

















  
  









 
 
 










 















 







 






 



 
 

 

 
 






 





 


































 





 




 

 

















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



 
 
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












 













 

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









 





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







 



 







 





 

 

 

 

 






 









 



 
 


 






 


 


 










 








 







 



 


























 
 

















 

 
  









 



 



 












 






 



















 



 



 
 
 






 


 







 
 


 










 







 
 
 



 
 



 







 
 

••
 





 





 
 





 



 
 




 






 




 



 

 




 


 


 


 

 


 



 




 
 


















 





























































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










 

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






















 


 





 






















 


































 


































 




 



 


 




 























 

















 










 


















 

















 









 














 





 







 
 





 







 


 



























 

















 


 













 

























 












 












 












 




















 
 





























 





















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



















 







 









 
























 
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

 



 

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












 
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







 
 















 






















 
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



















 







 






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








 
 
 



















 



 




















 













 
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











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




 
 


 

 











 









 































 
 




 




















 
 



 



 



 
















 







 








 
 






 
 
 


 


 



 



 


 
 


 


 
 

 
 


 









 



 




 
 



 



 
 





























 






 


 


 
 

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












 
 



 

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
  
































































































 
 






 




 














 
 




 





 
 




 

 


 
 






 






 



 
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















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 



 




 

 




 




 

 
 



 









 
 









 


 


 





 


 







 
 
  






 


 





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 
 



 




 
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










 
 

 







 
 












 




 
 
  

 


 
 




 


 


 
 




 
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













 























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




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 
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
























 
 
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








 
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




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
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



















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 
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



















 



















 



 
 





























 












 






 
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





 
 



 






 
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



 



 
 







 


 

 













 






 

 




  




 



 







 
 






 






 








 
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

















 



 





 



 




 




 

 







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


 


 
   
 


 



 

 
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









 




 
 








 




 









 



  

 


 

 







 



 


 
 


 























