Indian Standard
( Reaffirmed 2001 )
SPECIFICATION FOR
PVC INSULATION AND SHEATH OF
ELECTRIC CABLES
(
First Revision )
Fourth Reprint JANUARY 1998
UDC 621.315.221.8:621.315.616.96[678.743.22]
B U R E A U QP I N D I A N BTANDARDI
MANAlL EHAVAN, 9 BAHADUR SHAH ZAPAR INAltONEW DELHI 110002
s#pmbn 1984
IS : 5831.1984
Indian Standard
SPECIFICATION FOR
PVC INSULATION AND SHEATH OF
ELECTRIC CABLES
( First Revisiop )
Power Cables Sectional Committee, ETDC 59
Chairman
SEIRI M. L. DON~RE
M-3, Satyam,
88, Sion Circle, Bombay
Represent&g
Bharat Heavy Electricals Ltd, Hyderabad
Members
SHRI J. P. ANAL
S HRI B. P. RAI ( Alternate)
S HRI M. R. BEAT
SHRI D. K. BASU ( Alternate )
CHIEF ENGINEER ( EL E C T R I C A L ) I
WORKS
S URVEYOR o F
( ELECT ) V ( Alternate )
D R K. DAS G U P T A
Tata Consulting Engineers, Bombay
Central Public Works Department, New Delhi
Calcutta Electric Supply Corporation ( India )
Ltd, Calcutta
S HRI P. NEOQI ( Alternate )
Central Power Research Institute, Bangalore
D IRECTOR
S HRI M. C. RATRA (Alternate )
S AFETY Directorate General of Mines Safety, Dhanbad
D IRECTOR OR M I N E S
( ELECT ) ( HQ )
D IRECTOR OF, MINES SAFZTY
( ELECT ) ( Alternate )
Cable and Conductor Manufacturers’ Association
S HRI R AVI K. DU T T
of India, New Delhi
SHRI S. R. SARAN ( Alternate )
Indian Cable Co Ltd, Jamshedpur
SIIRI P. Grrosu
SHRI K. V. R. Rao ( Alternate )
Cable Corporation of India Ltd, Bombay
SHRI M. M. H~NAVAR
\
SIIRI S. R. PAUMAN~BHAN ( Alternate J
Directorate
of Technical Development & ProducSI~I D. K. J AIN
tion ( Air ), New Delhi
SIII~I V. K. Snanaa~ ( Alternate )
Bombay Suburban Electric Supply Ltd, Bombay
SIII<I K. S. Josrrr
Srirtr R. K. Ssaoa~ ( Alternate )
( Continued on page 2 )
@ CoPYright 1984
BUREAU OF INDIAN STANDARDS
This publication is protected under the Indian Copyright Act (XIV of 1957 ) and
reproduction in whole or in part by any means except with written permission of the
publisher shall be deemed to be an infringement of copyright under the said Act.
IS:!X?l- 1984
( Continuedfrom page 1
)
Members
Representing
SHRI S. L. KA K R A R
Universal Cables Ltd, Satna
SHRI R. C. AQRAWAL ( Alternate )
S HRI R AJ K. MI T A L
Delhi Electric Supply Undertaking, New Delhi
SHRI V. K. SAEHUJA (Alternate )
S HRI R. V. NA R A Y A N A N
Directorate General of Supplies & Disposals
( Inspection Wing ), New Delhi
S HRI D. R. C HANDRA ( Altevuzte )
S HRI H. M. PAI
The Federation of Electricity Undertakings of
India, Bombay
SEEIMATI C. BALI~A ( Alternate )
SHRI S. N . PARWAL
The Premier Cable Co Ltd, Eranakulam
( Kerala )
Asian Cables Corporation Ltd, Bombay
S HRI A. K. RA~AN
S HRI S. M. SA E H A L K A R
Bombay Electric Supply & Transport Undertaking, Bombay
S HRI S. V. U PASANI ( Alternate )
S HRI L. K. SAN~HI
Fort Gloster Industries Ltd, Howrah
SHRI A. S. BZIATTACHARJEE ( Alternate )
Controllerate of Inspection Electronics, Bangalore
LT-COL S. R. SEN
S HRI S. K. MALHOTRA C Alternate )
Punjab Research Institute, Rajpura
D R M. S. SUKIIIJA
National Test House, Calcutta
SHRI U. S. VERMA
S RRI R. RAI~AERISIXNA ( Alternate )
Oriental Power Cables Ltd, Kota
S HRI K. G. WARRIER
S HRI B. K. M UNDHRA ( Alternafc)
Director General, IS1 ( Ex-o&id Mumber )
S HRI S. P. SAC~DEV,
Director ( Elec tech )
Secretary
S HRI K. M. B H A T I A
Senior Deputy Director ( Elec tech ), IS1
Panel for Elastomeric and Thermoplastic Cables, ETDC 59/P4
Convener
Fort Gloster Industries Ltd, Howrah
Members
S HRI A. S. B HATTACHARJEE ( Alternale to
Shri L. K. Sanghi )
The Calcutta Electric Supply Corporation
SHRI B. R OY CHOWDHURY
( India ) Ltd, Calcutta
S HRI P. NEO~I ( Alternate )
Indian Cable Co Ltd, Jamshedpur
S HRI P. GHOSR
S HRI K. V. R. R AO (Alternate )
Cable Corporation of India Ltd, Bombay
SHRI M. M. HO N A V A R
S RRI S. R. PADMANABHAN ( Alternate )
Universal Cables Ltd, Satoa
S HRI S. L. KA K K A R
SHRI R. C. AORAWAL ( Altsmafe )
The Ahmedabad Electricity Co Ltd, Ahmadabad
S HRI J. V. ME H T A
Oriental Power Cables Ltd, Kota
S HRI B. K. MIJNDHRA
Delhi Electricity Supply Undertaking, New Delhi
S HRI A. S. PINTO
Industrial Cables ( India ) Ltd, Rajpura
S HRI S. R. SA R A N
SlsRIL.K.SANQHI
2
IS:5831-1984
Indian Standard
SPECIFICATION FOR
PVC INSULATION AND SHEATH OF
ELECTRIC CABLES
( First Revision)
0. FOREWORD
0.1 This Indian Standard ( First Revision ) was adopted by the Indian
Standards Institution on 30 April 1984, after the draft finalized by the
Power Cables Sectional Committee had been approved by the Electrotechnical Division Council.
0.2 This standard was originally published in 1970 with d view to bring
under a single cover the various requirements for PVC insulation and
sheath of different types of cables.
0.3. This revision has been undertaken to update it in the li~llt of further
experience and developments and to align with international practice,
where appropriate. Details about methods of test have been, by and large,
taken out from this standard and are now covered in a separate standard,
to which reference has been made at appropriate places.
U.4 This standard is complementary to the individual specification for
different types of cables.
0.5 In preparing this standard, considerable assistance has been derived
from IEC Publication 502 ( 1983 ) ‘ Extruded solid dielectric insulated
power cables for rated voltages from 1 kV up to 30 kV ‘, issued by the
International Electrotechnical Commission ( IBC ) .
0.6 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated, expressing the result of a test shall be rounded off in accordance with IS : 2-1960*.
The number of significant places retained in the rounded off value should
be the same as that of the specified value in this standard.
*Rules for rounding off numerical values ( revised ).
3
IS : 5831. 1984
1. SCOPE
1.1 This standard specifies the physical and electrical requirements for
PVC insulation and sheath of electric cables.
1.2 The types of PVC compounds covered by this standard are given
below:
General purpose insulation for maximum rated conductor
Type A
temperature 70°C intended for cables with rated voltages
U,/U up to and including 3.313.3 kV.
General purpose insulation for maximum rated conductor
Type B
temperature 7OW intended for cables with rated voltages
U,/U above 3-313.3 kV.
Heat
resisting insulation for maximum rated conductor
Type C
temperature 85°C intended for cables with rated voltages
up to and including 1 100 volts.
Type ST1 General purpose sheath intended for use in cables operating at a maximum rated conductor temperature 70°C.
Type ST2 Heat resisting sheath intended for use in cables operating at a maximum rated conductor temperature 90°C.
2. TERMINOLOGY
2.0 For the purpose of this standard, the definitions given in IS : 1885
( Part 32 )-1971* shall apply, in addition to the following.
2.1 Variation - Difference between the median value obtained after
ageing and the median vaIue obtained without ageing, expressed as a
percentage of the latter.
3. COMPOSITION
5.1 The insulation or sheath shail consist of a compound based on one of
the following materials, which have been suitably compounded and processed to meet the requirements of this standard:
a) Polyvinyl chloride ( PVC ),
b) Suitable co-polymers of which the major constituent shall be vinyl
chloride,
c) Mixture of (a) and (b).
4. TEST
REQUIREMENTS
4.1 The insulation and sheath shall satisfy the test requirements stated in
Tables 1 and 2 respectively, to the extent specified in the relevant cable
standard.
+Electrotechnical vocabulary : Part 32 Cables, conductors and accessories for electric
SUPPlY -
4
IS : 5831 - 1984
TABLE 1
TEST REQUIREMENTS FOR PVC INSULATION
( c1uusc 4.1 )
SL
No.
(1)
T EST
(2)
i) Volume resistivity, Min
a) at 27°C ($81 Note 1 )
b) at maximum
rated
temperature ( ice 1.2 )
ii) Insulation resistance constant, Min
a) at 27*C ( see Note 1 )
b) at maximum rated
temperature ( se.9 1.2 )
iii) Without ageing
a) Tensile strength, Min
b) Elongation at break,
Min
iv)
After ageing in air oven
f Tempera1 ture (tolea) Treatment { rance
I rt2”C)
[Duration
b) Tensile strength
1) gfiue after ageing,
2) Variation, Max
c) Elongation at break
1) Vr&ue after ageing,
2) Variation, Max
v)
Loss of mass in air oven
[Tempera1 tllre ( tolea) Treatment{ rance
I. ,!:,:I2
U NIT
T YPE OF INSULATION
~~~~~h~_~~~~
C
A
B
(3)
(4)
(5)
(6)
Ohm-cm
Ohm-cm
1 x 10’3
1 x 10’0
1 x 1014
1 x 10’s
I x 1010
I x 1011
M ETHOD
OB TE S T
~zz?G:.
OB IS:
10810+ )
(7)
43
43
MQkm
MS&km
36’7
0.037
367
0’37
36.7
0.037
N/mms
percent
12’5
150
12.5
135
12’5
125
“C
80
100
135
days
7
7
7
12’5
7
II
N/mm*
12’5
12’5
percent
f 20
f 25
percent
150
125
percent
f 20
f 25
“C
80
days
7
-
-
f 25
125
* 35
-
10
( conrirmd )
5
ISr!ml-1984
TABLE I
TEST REQUIREMENTS FOR PVC INSULATION - Contd
SL
No.
TEST
(1)
(2)
UNIT
T YPE OB INEIULATJON
F-_-h_---~
B
C
A
(3)
(4)
(5)
(6)
“C
80
80
95
hours
4
6
50
-
vi) Hot deformation test
Test temperature
( tolerance f 2°C )
Time under load ( MC
Note 2 )
First case
Second case
Depth of indentation,
Max
METHOD
T EST
( R EB TO
P ABT No.
OP IS :
108105 )
OF
(7)
15
hours
percent
6
50
6
50
14
vii) Heat shock test
r TemperaI ture (tolea) Treatment{ rance
I *2”c)
[Duration
b) Visual examination
“C
150
150
150
I
I
1
No signs of cracks or scales
hour
-
12
viii) Shrinkage test
r Tempera) ture ( tolea) Treatment { rance
I f 2°C)
LDuration
b) Shrinkage, Max
“C
150
150
150
minutes
percent
15
4
15
4
15
4
20
ix) Cold bend test
(for diameter < 12’5 mm)
a) Test temperature ( tolcrancc * 2°C )
b) Visual examination
“C
- 15
- 5
- 15
No signs of cracks or scales
21
x) C o l d i m p a c t trst ( for d i a m e t e r > 12.5 IllIn )
a) Test t?mpt’rature ( tole-
“C
- 5
b) Visual examination
-
No signs of cracks or scales
r a n c e f 2%
)
- 5
- 5
( Continued )
6
Isr5831-1984
TABLE
1 TEST REQUIREMENTS FOR PVC INSULATION - Contd
TEST
(2)
(1)
xi)
xii)
T YPE OB INSULATION
C__-h--7
C
B
A
U NIT
(8)
Colour fastness to daylight
exposure, Mitt
Colour fastness to water
C Tempera1 ture ( tolea) Treatment{ rance
(4)
4
rating
“C
70
(Duration
hours
b) Visual examination
xiii) Thermal stability
“C
a) Test temperature
( tolerance * 0’5OC )
minutes
b) Time, Min
xiv) Bleeding and blooming test
( Tempera“C
( ture ( tolea) Treatment{ rance
I f 2°C)
1 Duration
hours
b) Observation
Water absorption test
( gravimetric )
f TemperaI t u r e ( totea) Treatment {’ rance’
I l PC 1
1 Duration
b) Water absorbed, Max
(8)
4
( I~C Note 3 )
I f 2OC)
xv)
(5)
4
METHOD
OB TEST
( REP TO
P ART No.
OF IS :
10810* )
(7)
18
70
70
48
48
48
fret from traces of colour
( w Note 4 )
200
200
200
80
100
100
50
50
50
19
72
72
72
no appreciable staining of
indicator compound or
filter paper
33
*Cl
85
days
mg/cms
-
14
10
-
-
NOTE 1 - V o l u m e resis_tivity and insulation resiattnce tests mpy be done at
room temperature instead oi 27°C. However, in case of doubt or disputr, the test
results shall bc confirmed by testing at 27°C.
N OTE 2 - Time under load:
First case- Cab1t.s having a rated voltage not exceeding 3*3/3*3’3 kV
and a wnductor cross-section notexceeding 35 mm*.
Second cate-Cables not covered under first case.
Now 3 - Undrr preparation. In the meantime, test method given in Appendix
A shall be folloued.
Norr~ 4 - Under p r e p a r a t i o n . I n t h e m e a n t i m e , t e s t m e t h o d s g i v e n i n
Appendix U shall be followed.
*Methods of tryst for cables.
7
1s : 5831 - 1984
TAELE 2
TEST REQUIREMENTS FOR PVC SHEATH
( Clause 4.1
TEST
T YPE OB SH E A T H
_--h-_--,
ST2 ’
ST1
UNIT
l%.
(1)
(2)
(3)
(4)
(5)
N/mm%
percent
12’5
150
12’5
150
“C
80
100
days
7
7
N/mm*
12.5
12.5
percent
f 20
f 25
percent
150
150
percent
z!z 20
f 25
“C
80
100
days
mg/cma
7
2
7
2
“C
80
30
hours
hours
percenl
:
50
ti
6
50
i) Without ageing
a) Tensile strength, Min
b) Elongation at break,
Min
11
Min
2) Variation, Max
iii)
10
Loss of mass in air oven
(TemperaI ture ( tolea) Treatment{ rance
I f 2°C)
(Duration
b) Loss of mass, MUX
15
iv) Hot deformation test
a) Test temperature
( tolerance l 2°C )
b) Time under load
( see Note 1 )
First case
Second case
c) Depth of indentation,
Max
(6)
7
ii) After ageing in air oven
r Temperature ( tolea) Treatment .! rance
i f 2oc)
1Duration
b) Tensile strength
1) Value after ageing,
Min
2) Variation, Max
c) Elongation at break
1) Value after ageing,
hhWHODOB
TEST (REP
PART No. or
IS: 10810* )
( Confinucd )
8
fSr5831-1984
TABLE 2
SL
No.
(1)
TEST REQUIREMENTS FOR PVC SHEATH - Confd
TEST
(2)
U NIT
TYPEOFSHEATH
_-h_l-y
‘ST1
ST2
(3)
(4)
“C
150
150
1
1
(5)
v) Heat shock test
(TemperaI ture f tolea) Treatment{ ran&
I * 2°C )
1Duration
b) Visual examination
hour
-
150
150
minutes
15
15
b) Shrinkage, M UX
percent
(6)
4
4
20
“C
- 15
- 15
No signs of cracks
or scales
b) Visual examination
21
“C
- 5
b) Visual examination
-
ix) Colour fastness to daylight
exposure, Min
rating
No signs of cracks
or scales
4
4
- 5
18
( See Note 2 )
x) Colour fastness to water
f TemperaI ture ( tolea) Treatment{ rance
i 2°C )
i, Duration
b) Visual examination
OP
12
“C
viii) Cold impact test for diameter > 12.5 mm
a) Test temperature
( tolerance * 2°C )
No.
No rigyc;racks or
CTempera1 ture ( tolea) Treatment{ rance
I -f 2 ° C )
LDuration
Cold bend test for diameter
< 12’5 mm
1) Test temperature
( tolerance * 2°C’
PAR;
I S : 10810* )
14
vi) Shrinkage test
vii)
M ETHOD OF
T EST f REPTO
“C
hours
-
70
70
48
48
Free from traces
of colours
( Confinued )
9
ISr!5831- 1984
TABLE 2 TEST REQUIREMENTS FOR PVC SHEATH - Contd
SL
No.
TEST
U NIT
(1)
(2)
(3)
T YPE OF S HEATH
~---_*_-~~
ST1
ST2
(4)
(5)
( See Note 3)
xi) Thermal stahility
a) Test temperature
( tolerance f 0’5%
M ETHOD OF
T EST ( REP TO
P ART No. O F
IS : l;)lo* )
)
bj Time, Min
OC
200
200
minutes
40
80
“C
50
50
72
72
xii) Bleeding and blooming
[Tempera/ ture \ ( tolea) Treatment{ rance
I f 2°C)
1 Duration
19
hours
appreciable
No
staining of indicator
compound or filter
pap&
b) Observations
-
xiii) Oxygen index
( Under consideration )
NOTE 1 - Time under load:
First case-4 hours for test piece having an outer diameter not
exceeding 12’5 mm.
Second case--6 hours for test piece having an outer diameter
exceeding 12’5 mm.
NOTE 2 - Under preparation. In the meantime, test method given in Appendix
A shall be followed.
N OTE 3 - Under preparation. In the meantime, test method given in Appendix
B shall be followed.
*Methods of test for cables.
10
IS: !%831-1984
APPENDIX A
[ Tuble 1, Item ( xii ) and Table 2, Item ( x ) ]
TEST FOR COLOUR FASTNESS TO WATER
A-l. A piece about 100 mm long of insulation or sheath is out into small
pieces and immersed for the specified period in about 10 times its own
volume of distilled water maintained at the specified temperature. At the
end of the period, the water shall be examined. It shall be free from any
trace of colour.
APPENDIX B
[ Table 1, Item ( xiii ) and Table 2, Item ( xi) ]
THERMAL STABILITY TEST
B-l. Testing Equipment
El.1 Class tubes closed at one end 110 mm long with an outer diameter
of approximately 5 mm and an inner diameter of 4.0 f 0.5 mm.
B-l.2 Universal indicating paper with a PH range of 1 to 10.
B-1.3 Thermostatically controlled heating apparatus for the specified
temperature.
B-l.4 Thermometer calibrated in divisions of O*l”C.
B-1.5 Stop-watch or a suitable time meter.
B-2. Testing M e t h o d
a) From the insulation of each core to be tested or from the sheath
to be tested, three samples, each of 50 f 5 mg, shall be taken in
the form of strip, if possible. For small thickness the sample
may consist of two or more strips. Each sample shall be inserted
into a glass tube as specified in B-1.1. The sample shall occupy
the bottom of the tube and not project more than 30 mm above
the bottom.
b) A strip of dry universal indicating paper as specified in B-1.2,
about 15 mm long and 3 mm wide, shall be inserted into the
open end ( top ) of the glass tube so that the strip protrudes
a b o u t 5 mm out of the tube and can be bent to keep it i n
position.
11
k3 : 5831 - 1984
c) The glass tube shall be placed into the heating apparatus, as
specified in B-1.3, which has already attained the test temperature specified. The glass tube shall be inserted. into the heating
apparatus for a depth of 60 mm.
4
The time taken for the universal indicating paper to change
colour from a pH value of 5 to a pH value of 3 shall be measured,
or the test continued for the specified duration without the
colour change occurring. The colour change point shall be considered to have been reached when the red colouring of the
universal indicating paper characteristic of a @H value of 3 is just
becoming visible. The universal indicating paper shall be
renewed ( especially for long duration stabilities ) ‘towards the
end of the expected test time every 5 to 10 min, so that the
change point is better visible.
B-3. Evaluation
B-3.1 The average value of the thermal stability times of the three samp
les shall not be lower than the value specified in Table 1 or Table 2 as
applicable.
12
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Printed at Simco Printing Press, Delhi
AMENDMENT NO. 1
APRIL 1985
TO
IS:5831 -1984 SPECIFICATION FOR PVC INSULATION
AND SHEATH OF ELECTRIC CABLES
(First Revision)
[Page 5, Table 1, SZ No,(v), itm (a)] - Insert
the following after this iten:
‘(1)
(2)
b) Loss of
mass,
(3)
m&cm2
(4)
(5)
2
(6)
-
(7)
-
I
MZX
[Page 6, Table I, SZ No, (vi), itm (b), first
case, co1 (611 - Substitute '4' for '-'.
[Page 7, Table 1, LZ No. (xv)]:
a) - Substitute 'tolerance' for 'toterance'.
b) - Substitute 'absorbed' for 'absortd'.
[Page 8, Table 2, 5'2 No.(iv), item(a), co2 (5)] abstitute '80' for '30°.
,kTge 11, clause A-l, line 1) - Substitute 'cut'
fop
I0
(Page 11, clause B-1.1, 'line 1) - Substitute
'Glass' for 'Class'.
(ETDC 59)
Printed a! Simco Printing Press, Delhi, India
AMENDMENT NO. 2
DECEMBER 1995.
IS 5831 I 1984 SPEC%CATlON FOR PVC
SHEATH OF ELECTRIC CABLES
INSULAT ION A ND
( Puge 4, clmse I.2 ) -- Add the following matter between ‘Type
C’ and ‘Type ST1 :
‘Type II General purpose insulation for maxiinum rated conduct o r temncruture 7 0 ’ C intended Tar flexible c a b l e s wit)1
up to and including R-3/3*3 kV.’
the I’ollowi~r~ new pata for Type S.1’3
sheath intended for use in flexible
at maximum rated conductor tem-
‘_I..
I able 1 ( C’onriftued )
‘/
!
I
/
,2) Variation, dfw
u i r oven *
Teniperaturc
( tolcrnnce f’ 2°C )
R) TMtdcnt
1
Ihr:iliori
b) L o s s o f ntass. ,Ifax '
7) Losvotninss
’
.;
.
I
’
( lolcrluce f 2X’ )
b\ Tinlr nnder land ( .le~’ Note 2 )
1) Firal case
2) scconh CnFC
N/IIWP
?tiii)
pcrccnl
pcrccnf
c
Terr~pc~;~lurc
tolerance f 2°C)
. . .
” ‘-b) Visual cxnniinnjiou
I’
tl3ys
mg/cm*
,
EO
7
2
; 2:
bows
4
IloIlrs
65
“C
how
___
I 50
J
No signs ol cracks
or scales
15
6
-15
No signs of cr.tckc 01
scnlcs
C~~d,i~l~c~ test ( for dimueter
b) Visual cxaniinntiorr
.
.
,
0.
c
-
No signs of’ cracks or
SCillhJ
2
Illceding nrd tlloorlliIlg ICFI
a)
‘I rcnlrncnt
J(
‘l’elnp I :1111rc
Iolcr~lllcc f 7°C.)
1. I)ilt;llior~
!\(I
150
> 12‘5 111111 )
n) Test tcIIlpcrntlIlc ( IOICIilIlCC
* 2°C)
xiv)
1,) Oh5rt \';,I itrr1
.’
x)
'l~llCllllill slcibilily
b) ‘l’irllc, 11fin
“C,
Hear shock test
r
f ~Icwpcrrlfltrr
{ ( ~olcl;~llrc + ?"f? )
I_ I)ur:tlion
b) Visual cxarriitwliofl
prrccnt
pcrccnt
C) Depth of lllde~~lilli()ll. hfo.r
..__
3) l'lr:llllI~rll
“(’
a) Test tcmpcr:il~~rc
vii)
-.-
xii)
Ch)3
in
I’
1lOt dCfOfIlh7tfdl ICSt
VI)
Tea,
RI No.
c 0 ,
( tnlcrawe f 2°C )
{ Dur:ltion
h) Trn*ilc strength
I ) Valua ofltr~a~csit~g. Afln
1’
: 2) Variation. Ai8.r
I!) Elongalion 1; blc;lk
I) Vnluc alter nl:uinl~, AfIn
‘4
.._-- -... ._
(3)
IclllpcI;llurc
,‘* n) Trcnlmcnl
a-
1 ype of III~ullltlOll
Upi1
f!)
( I )
i v ) A f t e r agcinl in ait oven
‘I’nhle I ( Ch
-_
3) 'llc:l~rllclll
f T’mpernlule
i ( lotcInIlce + 3"<' 1
i lhr;ltiot~
‘I’nhle 1 ( Cortclrded )
Unit
Type of lnsulrllon
c---h-___.__
(1)
(3)
xi)
rating
(‘;I
4
“C
70
Irorirs
_-
48
Free from traces of
colour
xii)
,
xiii)
“C
it) 'ICSI lel~lpClilllllC ( ll~1CIilllCC
1
* 0'5°C)
Minute
b) ‘I’irtle, Olin
i
xiv)
i
xv)
lllccdiug nutl bloon~ing Ic5l
‘l’eilll)L I :Ilurc
a) ‘I rcnlincul 1 ( tolcralKc f
t. I)ur:iliou
11) Oh~ci\alioli
“CT
2°C’ )
hours
--
\\‘;Ilcr ;tlr~orl~liofi Ic’,,l ( g:l;iviuicliic )
I Telllpernluie
il) ‘ I Icilllncr~l 4 ( tolernnce f -?“C’ 1
1
80
l~ll~illic~ll
“C
di1J.S
nlg,‘clll~
b) \V:lter nbsol bed, Aft~.r
[ I’ugc IO, lirhle 2, rol 6, SI Ivo. ( xi ) ] ---.
‘( See No\c 3 1’.
Substitute
a(,~’ for
( I’r/ge I O , /vo/c. .J ) ’ I~clclc.
( Pn,f~es 8 , 9 (I) tl IO. Tit/j/c 2 ) -.-- Add t h e fullcl\\ing ‘[‘es! Require_
II\CII~S for tlw IICW f’\‘C C‘OIU~WLIII~ ‘Type ST3 u n d e r column heading
‘1 ypc of SI~CIIIII’ :I\ rol 6 (:I‘ Illis iiI\>le ant1 r e n u m b e r t h e existing ~01 6
3s Cfll 7 :
3
S1 No.
(1)
b’
ii)
Test
1Jlli1
(2)
(3)
,Aflcr nscing in air nvct)
I ‘I cn,pcrnturc
n) ‘I’rcnttiicnt ( (lOll!lilllCC f
0.
c
T"d:
T! pc o
hcnth
(6)
7
x0
)
\ L)lllillillll
IhI!!?
N/ inni
pclctlrt
pclcellt
pxcclll
7
10‘0
% 20
I 50
f 20
iii)
0.
c
tlnys
lll~!Iclrl~
X0
7
2’0
iv)
“t '
hours
hours
21 sccollcl c:1rc
C)
lkptli of intlccit;ilion. Jfnx
’
70
.I
6
pcrccii(
65
“C
IS0
lle;\t sllock lcsl
'ICIII~CI alille
{ t lolcrencc $2
(
U)
'I
ICilllllCl~~
b) Visllal
2°C )
hour
-
1 I~uralinn
cx;miin:itinn
1
No signs of cracks or
scalcz
vi)
‘I
;’
\ii)
’ II) ‘lest Iclllperu(lilc
(
1~) \‘i~rl;il
biii)
,’
IOITIilllCC & 2°C )
"C
-
~~;ll~iillillioll
Cold iriijxlcl
> I?‘5 111111
- I5
,
Nn signs 01 crilcks or
sc:lIc~
Icql
for di:)melcr
y:
-5
No signs nf’cr‘lcks nr
<c:, IIZS
‘4
Type of Sheath
(6)
4
”
.
(.
IIOIII~
-
70
411
I.rcc froril trnccs of
colours
“I’
700
hlinulec
40
so
72
N o ;lyprcciable stainitip, or indic:ltor coiiipound or filler paper