Smart solutions for comfort and safety
UL/CSA approval of small motors
Smart solutions for comfort and safety
UL / CSA approval of Saia- Burgess motors
Introduction
• UL = Underwriters Laboratories Inc., US:
an independent, not-for-profit product-safety testing and certification organization,
first founded in 1894, second foundation in 1903,
123 UL centres worldwide,
62 laboratories and certification facilities,
more than 71.000 companies use UL marks,
• Historical background: initiative from insurance companies
• Motivation: avoid fire (e.g. many houses made of wood) and other hazards
• More than 800 valid UL standards on safety
developed 1,291 UL and 376 CSA standards for different products
• Approbation of products linked with factory inspection
(each quarter or half a year)
2
Smart solutions for comfort and safety
UL / CSA approval of Saia- Burgess motors
Standards
• UL 1004 / CSA100
Electric Motors
Creepage distance and clearances
Insulation system
power supply means
box and/ or plastic material
• UL 863
Time- Indicating and Recording Appliances
• UL 1446
Electrical Insulation Systems (EIS)
previous applied standard – do not use for new motors
Thermal aging tests, dielecric strength, ...
Very extensive for untested materials – 12 to 18 month
•UL 2111 / CSA 77
Thermal Overload Protection of Motors
Impedance protected or Thermally protected motors
•UL 94
Tests for Flammability of Plastic Materials
Preselection testing
Flammability classification (HB / V-2 / V-1 / V-0 / 5V)
3
Smart solutions for comfort and safety
UL / CSA approval of Saia- Burgess motors
Marks
• UL Recognized Component Mark
- specifically used on components that are part
of a larger product or system
- mark for insulation system inside motor
- mark for our motor according at least one UL standard
- for combined compliance to the
Canadian and US Standard
• UL Listed Mark
- mark for representative samples on end-products
(customer)
4
Smart solutions for comfort and safety
UL / CSA approval of Saia- Burgess motors
Procedure for obtaining UL approval
•
Creation of a new Electrical Insulation System (EIS)
- e.g. UL approval of existing motors
- Long Term Aging Test
- handling time 12 to 18 month
- preferably to avoid
•
Adaptation of an existing EIS
- Selection of pre- certificated EIS from different plastic suppliers
- e.g. DuPont offers actual 455 EIS under File E 69939
- use of these EIS is free of charge after authorisation
- preferred for new developing motors
•
Admission of “Minor Components” in existing EIS
- upgrading of existing EIS only for Minor Components (lead wire, tape, motorplate ...)
- shortened “Sealed Tube Test”
- handling time 6 weeks
5
Smart solutions for comfort and safety
UL / CSA approval of Saia- Burgess motors
Yellow Card
6
Smart solutions for comfort and safety
UL / CSA approval of Saia- Burgess motors
Conclusions
• Basis of calculation is not clear and offers increase year per year
remarkably!
strong differences depending on approach
small differences according to country of application (Germany vs. US)
• Long duration for applications and difficult work with UL
no clear definition of ways towards approbation (e.g. mix of insulation systems for UC)
long time (e.g. 9 month for complete process between offer and end of project)
result is not only based on standards (“It is not mathematics, it is UL.”)
• For improvement of work we invested in qualification of engineers and
decided to work only direct with UL Germany for better understanding
and cooperation.
after we gained experience with two direct applications in US
7
Smart solutions for comfort and safety
UL / CSA approval of Saia- Burgess motors
Summary
• Our preferred way:
give our customer data of used materials (if not special know-how) for his
own certification
Advantage: no additional costs!
Yellow card + minimum thickness
This way was used successfully with motors and solenoids
• New motors >40 mm with UL 1004 / CSA 100 – Electric Motors
If there are customer requests – application for UL1004
Motor design takes care of current UL 1004 requirements
Motors <40 mm may not, <36 mm can not fulfil large UL clearance and creepage distances
New designs usually use “free” UL - Insulation Systems from DuPont
Is CSA 100 really necessary, it seems to double costs ?
• Avoid special standards, e.g. UL 2111 / CSA 77 or include fully in
calculation of project
• Future: we discuss to establish a own insulation system (for Saia-Burgess
new products or for whole Johnson)
8