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है”ह”ह

IS 5831 (1984): PVC insulation and sheath of electriccables [ETD 9: Power Cables]

Indian StandardSPECIFICATION FOR

PVC INSULATION AND SHEATH OFELECTRIC CABLES

( First Revision )Fourth Reprint JANUARY 1998

UDC 621.315.221.8:621.315.616.96[678.743.22]

BUREAU QP INDIAN BTANDARDIMANAlL EHAVAN, 9 BAHADUR SHAH ZAPAR INAltO-

NEW DELHI 110002

s#pmbn 1984

IS : 5831.1984

Indian StandardSPECIFICATION FOR

PVC INSULATION AND SHEATH OFELECTRIC CABLES

( First Revisiop )Power Cables Sectional Committee, ETDC 59

ChairmanSEIRI M. L. DON~RE

M-3, Satyam,88, Sion Circle, Bombay

MembersSHRI J. P. ANAL

SHRI B. P. RAI ( Alternate)SHRI M. R. BEAT

SHRI D. K. BASU ( Alternate )

Represent&gBharat Heavy Electricals Ltd, Hyderabad

Tata Consulting Engineers, Bombay

CHIEF ENGINEER ( ELECTRICAL ) I Central Public Works Department, New DelhiS U R V E Y O R o F WORKS

( ELECT ) V ( Alternate )DR K. DAS GUPTA Calcutta Electric Supply Corporation ( India )

Ltd, CalcuttaSHRI P. NEOQI ( Alternate )

DIRECTORSHRI M. C. RATRA (Alternate )

D IRECTOR OR M I N E S SAFETY

( ELECT ) ( HQ )D IRECTOR OF, MINES SAFZTY

( ELECT ) ( Alternate )SHRI R AVI K. DU T T

Central Power Research Institute, Bangalore

Directorate General of Mines Safety, Dhanbad

SHRI S. R. SARAN ( Alternate )

Cable and Conductor Manufacturers’ Associationof India, New Delhi

SIIRI P. Grrosu Indian Cable Co Ltd, Jamshedpur

Cable Corporation of India Ltd, Bombay\SHRI K. V. R. Rao ( Alternate )

SHRI M. M. H~NAVARSIIRI S. R. PAUMAN~BHAN ( Alternate J

SI~I D. K. JAIN Directorate of Technical Development & Produc-tion ( Air ), New Delhi

SIII~I V. K. Snanaa~ ( Alternate )SIII<I K. S. Josrrr Bombay Suburban Electric Supply Ltd, Bombay

Srirtr R. K. Ssaoa~ ( Alternate )( Continued on page 2 )

@ CoPYright 1984

BUREAU OF INDIAN STANDARDSThis publication is protected under the Indian Copyright Act (XIV of 1957 ) andreproduction in whole or in part by any means except with written permission of thepublisher 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, SatnaSHRI R. C. AQRAWAL ( Alternate )

SHRI R AJ K. MI T A L Delhi Electric Supply Undertaking, New DelhiSHRI V. K. SAEHUJA (Alternate )

SHRI R. V. NARAYANAN Directorate General of Supplies & Disposals

S HRI D. R. CHANDRA ( Altevuzte )( Inspection Wing ), New Delhi

SHRI H. M. PAI The Federation of Electricity Undertakings ofIndia, Bombay

SEEIMATI C. BALI~A ( Alternate )SHRI S. N . PARWAL The Premier Cable Co Ltd, Eranakulam

( Kerala )SHRI A. K. RA~AN Asian Cables Corporation Ltd, BombaySHRI S. M. SAEHALKAR Bombay Electric Supply & Transport Under-

taking, BombaySHRI S. V. UPASANI ( Alternate )

SHRI L. K. SAN~HI Fort Gloster Industries Ltd, HowrahSHRI A. S. BZIATTACHARJEE ( Alternate )

LT-COL S. R. SEN Controllerate of Inspection Electronics, BangaloreSHRI S. K. MALHOTRA C Alternate )

DR M. S. SUKIIIJA Punjab Research Institute, RajpuraSHRI U. S. VERMA National Test House, Calcutta

SRRI R. RAI~AERISIXNA ( Alternate )SHRI K. G. WARRIER Oriental Power Cables Ltd, Kota

SHRI B. K. MUNDHRA ( Alternafc)SHRI S. P. SAC~DEV, Director General, IS1 ( Ex-o&id Mumber )

Director ( Elec tech )Secretary

SHRI K. M. BHATIASenior Deputy Director ( Elec tech ), IS1

Panel for Elastomeric and Thermoplastic Cables, ETDC 59/P4

Convener

SlsRIL.K.SANQHI

Members

Fort Gloster Industries Ltd, Howrah

SHRI A. S. BHATTACHARJEE ( Alternale toShri L. K. Sanghi )

SHRI B. ROY CHOWDHURY The Calcutta Electric Supply Corporation( India ) Ltd, Calcutta

SHRI P. NEO~I ( Alternate )SHRI P. GHOSR Indian Cable Co Ltd, Jamshedpur

SHRI K. V. R. RAO (Alternate )SHRI M. M. HONAVAR Cable Corporation of India Ltd, Bombay

SRRI S. R. PADMANABHAN ( Alternate )SHRI S. L. KAKKAR Universal Cables Ltd, Satoa

SHRI R. C. AORAWAL ( Altsmafe )SHRI J. V. MEHTA The Ahmedabad Electricity Co Ltd, AhmadabadSHRI B. K. MIJNDHRA Oriental Power Cables Ltd, KotaSHRI A. S. PINTO Delhi Electricity Supply Undertaking, New DelhiSHRI S. R. SARAN Industrial Cables ( India ) Ltd, Rajpura

2

IS:5831-1984

Indian StandardSPECIFICATION FOR

PVC INSULATION AND SHEATH OFELECTRIC CABLES

( First Revision)

0 . F O R E W O R D

0.1 This Indian Standard ( First Revision ) was adopted by the IndianStandards Institution on 30 April 1984, after the draft finalized by thePower Cables Sectional Committee had been approved by the Electro-technical Division Council.

0.2 This standard was originally published in 1970 with d view to bringunder a single cover the various requirements for PVC insulation andsheath of different types of cables.

0.3. This revision has been undertaken to update it in the li~llt of furtherexperience 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 fordifferent types of cables.

0.5 In preparing this standard, considerable assistance has been derivedfrom IEC Publication 502 ( 1983 ) ‘ Extruded solid dielectric insulatedpower cables for rated voltages from 1 kV up to 30 kV ‘, issued by theInternational Electrotechnical Commission ( IBC ) .

0.6 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated, expres-sing 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 shouldbe 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 forPVC insulation and sheath of electric cables.

1.2 The types of PVC compounds covered by this standard are givenbelow:

Type A General purpose insulation for maximum rated conductortemperature 70°C intended for cables with rated voltagesU,/U up to and including 3.313.3 kV.

Type B General purpose insulation for maximum rated conductortemperature 7OW intended for cables with rated voltagesU,/U above 3-313.3 kV.

Type C Heat resisting insulation for maximum rated conductortemperature 85°C intended for cables with rated voltagesup to and including 1 100 volts.

Type ST1 General purpose sheath intended for use in cables oper-ating at a maximum rated conductor temperature 70°C.

Type ST2 Heat resisting sheath intended for use in cables oper-ating at a maximum rated conductor temperature 90°C.

2. TERMINOLOGY2.0 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 afterageing and the median vaIue obtained without ageing, expressed as apercentage of the latter.

3. COMPOSITION5.1 The insulation or sheath shail consist of a compound based on one ofthe following materials, which have been suitably compounded and pro-cessed 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 inTables 1 and 2 respectively, to the extent specified in the relevant cablestandard.

+Electrotechnical vocabulary : Part 32 Cables, conductors and accessories for electricSUPPlY -

4

IS : 5831 - 1984

TABLE 1 TEST REQUIREMENTS FOR PVC INSULATION

( c1uusc 4.1 )

SL TEST UNIT TYPE OF INSULATION METHODNo. ~~~~~h~_~~~~ OB TEST

A B C~zz?G:.

OB IS:10810+ )

(1) (2)i) Volume resistivity, Min

a) at 27°C ($81 Note 1 )b) at maximum rated

temperature ( ice 1.2 )

ii) Insulation resistance cons-tant, Min

a) at 27*C ( see Note 1 )b) at maximum rated

temperature ( se.9 1.2 )

iii) Without ageinga) Tensile strength, Minb) Elongation at break,

Min

iv) After ageing in air ovenf Tempera-1 ture (tole-

a) Treatment { ranceI rt2”C)[Duration

b) Tensile strength1) gfiue after ageing,

2) Variation, Maxc) Elongation at break

1) Vr&ue after ageing,

2) Variation, Max

v) Loss of mass in air oven[Tempera-1 tllre ( tole-

a) Treatment{ rance

I ,!:,:I2.

(3) (4) (5)

Ohm-cm 1 x 10’3 1 x 1014Ohm-cm 1 x 10’0 I x 1011

MQkm 36’7 367MS&km 0.037 0’37

N/mms 12’5 12.5percent 150 135

“C 80 100

days

N/mm*

percent

7 7

12’5 12’5 12’5

f 20 f 25 f 25

percent

percent

“C

days

150

f 20

80

7

125

f 25

-

-

(6) (7)43

1 x 10’sI x 1010

43

36.70.037

712’5125

II135

7

125

* 35

10-

-

( conrirmd )

5

ISr!ml-1984

TABLE I TEST REQUIREMENTS FOR PVC INSULATION - Contd

SL TEST UNIT TYPE OB INEIULATJON METHOD

No. F-_-h_---~ OF TEST

A B C ( REB TOPABT No.

OP IS :108105 )

(1) (2)vi) Hot deformation test

Test temperature( tolerance f 2°C )Time under load ( MCNote 2 )First caseSecond caseDepth of indentation,Max

vii) Heat shock test

r Tempera-I ture (tole-

a) Treatment{ ranceI *2”c)[Duration

b) Visual examination

viii) Shrinkage test

r Tempera-) ture ( tole-

a) Treatment { ranceI f 2°C)LDuration

b) Shrinkage, Max

ix) Cold bend test(for diameter < 12’5 mm)

a) Test temperature ( tolc-rancc * 2°C )

b) Visual examination

x) Cold impact trst ( for d ia -meter > 12.5 IllIn )

a) Test t?mpt’rature ( tole-rance f 2% )

b) Visual examination

(3)

“C

hourshours

percent

“C

hour-

“C

minutespercent

“C

“C

-

(4) (5) (6) (7)

15

80 80 95

4 - -6 6 6

50 50 50

14

150 150 150

I I 1No signs of cracks or scales

150 150 150

15 15 154 4 4

12

20

- 15 - 5 - 15

No signs of cracks or scales

21

- 5 - 5 - 5

No signs of cracks or scales

( Continued )

6

Isr5831-1984

(1)xi)

xii)

xiii)

xiv)

xv)

TABLE 1 TEST REQUIREMENTS FOR PVC INSULATION - Contd

TEST UNIT TYPE OB INSULATION METHODC__-h--7 OB TEST

A B C ( REP TOPART No.

OF IS :10810* )

(2) (8) (4) (5) (8) (7)Colour fastness to daylight rating 4 4 4 18exposure, MittColour fastness to water ( I~C Note 3 )

C Tempera-1 ture ( tole- “C 70 70 70

a) Treatment{ ranceI f 2OC)(Duration hours 48 48 48

b) Visual examination - fret from traces of colourThermal stability ( w Note 4 )a) Test temperature “C 200 200 200

( tolerance * 0’5OC )b) Time, Min minutes 80 100 100

Bleeding and blooming test 19( Tempera- “C 50 50 50( ture ( tole-

a) Treatment{ ranceI f 2 ° C )1 Duration hours 72 72 72

b) Observation no appreciable staining ofind ica tor compound orfilter paper

Water absorption test 33( gravimetric )

f T e m p e r a - *Cl 85 -I t u re ( tote-

a) Treatment {’ rance’I l PC 11 Duration days - 14 -

b) Water absorbed, Max mg/cms - 10 -

NOTE 1 - Volume resis_tivity and insulation resiattnce tests mpy be done atroom temperature instead oi 27°C. However, in case of doubt or disputr, the testresults 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 AppendixA shall be folloued.

Norr~ 4 - Under prepara t ion . In the meant ime, tes t methods g iven inAppendix U shall be followed.*Methods of tryst for cables.

7

1s : 5831 - 1984

TAELE 2 TEST REQUIREMENTS FOR PVC SHEATH

( Clause 4.1

UNITl%.

T E S T TYPE OB SHEATH_--h-_--, hhWHODOB

TEST (REPPART No. or

IS: 10810* )

(6)

7

ST1 ST2 ’

(3) (4) (5)

N/mm% 12’5 12’5percent 150 150

“C 80 100

days

N/mm*

percent

percent

percent

7 7

12.5 12.5

f 20 f 25

150 150

z!z 20 f 25

“C 80 100

days 7 7mg/cma 2 2

“C 80 30

hourshours

percenl:

50

ti6

50

(1) (2)i) Without ageing

a) Tensile strength, Minb) Elongation at break,

Min

ii) After ageing in air oven

r Tempera-ture ( tole-

a) Treatment .! rancei f 2oc)1Duration

11

b) Tensile strength1) Value after ageing,

Min2) Variation, Max

c) Elongation at break1) Value after ageing,

Min2) Variation, Max

iii) Loss of mass in air oven

(Tempera-I ture ( tole-

a) Treatment{ ranceI f 2 ° C )(Duration

b) Loss of mass, MUX

iv) Hot deformation test

a) Test temperature( tolerance l 2°C )

b) Time under load( see Note 1 )First caseSecond case

c) Depth of indentation,Max

10

15

( Confinucd )

8

fSr5831-1984

TABLE 2 TEST REQUIREMENTS FOR PVC SHEATH - Confd

SL TE S TNo.

UNIT TYPEOFSHEATH M ETHOD OF_-h_l-y TEST f REPTO

(1) (2)v) Heat shock test

(Tempera-I ture f tole-

a) Treatment{ ran&I * 2°C )1Duration

b) Visual examination

vi) Shrinkage test

CTempera-1 ture ( tole-

a) Treatment{ ranceI -f 2 ° C )LDuration

b) Shrinkage, MUX

vii) Cold bend test for diameter< 12’5 mm1) Test temperature

( tolerance * 2°C’b) Visual examination

viii) Cold impact test for dia-meter > 12.5 mma) Test temperature

( tolerance * 2°C )b) Visual examination

ix) Colour fastness to daylightexposure, Min

x) Colour fastness to water

f Tempera-I ture ( tole-

a) Treatment{ rance

i,i 2°C )Duration

b) Visual examination

(3)

“C

hour-

“C

minutes

percent

“C

“C

-

rating

“C

hours-

‘ST1 ST2

(4) (5)

150 150

1 1

No rigyc;racks or

150 150

15 15

4 4

- 15 - 15

No signs of cracksor scales

- 5 - 5

No signs of cracksor scales

4 4

70 70

48 48

Free from tracesof colours

PAR; No. OPIS : 10810* )

(6)14

12

20

21

18

( See Note 2 )

( Confinued )

9

ISr!5831- 1984

TABLE 2 TEST REQUIREMENTS FOR PVC SHEATH - Contd

SL TESTNo.

(1) (2)

xi) Thermal stahility

a) Test temperature( tolerance f 0’5% )

bj Time, Min

xii) Bleeding and blooming[Tempera-/ ture ( tole-\

a) Treatment{ ranceI f 2°C)1 Duration

b) Observations

xiii) Oxygen index -

NOTE 1 - Time under load:

UNIT

(3)

OC

minutes

“C

hours

TYPE OF SHEATH~---_*_-~~

ST1 ST2

(4) (5)

200 200

40 80

50 50

M ETHOD OFT EST ( REP TOPART No. O FIS : l;)lo* )

( See Note 3)

19

72 72

No appreciablestaining of indicatorcompound or filter

(

First case-4 hours for test piece having an outer diameter notexceeding 12’5 mm.

pap&

Under consideration )

Second case--6 hours for test piece having an outer diameterexceeding 12’5 mm.

NOTE 2 - Under preparation. In the meantime, test method given in AppendixA shall be followed.

NOTE 3 - Under preparation. In the meantime, test method given in AppendixB shall be followed.

*Methods of test for cables.

10

IS: !%831-1984

A P P E N D I X 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 smallpieces and immersed for the specified period in about 10 times its ownvolume of distilled water maintained at the specified temperature. At theend of the period, the water shall be examined. It shall be free from anytrace of colour.

A P P E N D I X 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 diameterof 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 specifiedtemperature.

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 da) 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 inthe form of strip, if possible. For small thickness the samplemay consist of two or more strips. Each sample shall be insertedinto a glass tube as specified in B-1.1. The sample shall occupythe bottom of the tube and not project more than 30 mm abovethe 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 theopen end ( top ) of the glass tube so that the strip protrudesabout 5 mm out of the tube and can be bent to keep it i nposition.

11

k3 : 5831 - 1984

c) The glass tube shall be placed into the heating apparatus, asspecified in B-1.3, which has already attained the test tempera-ture specified. The glass tube shall be inserted. into the heatingapparatus for a depth of 60 mm.

4 The time taken for the universal indicating paper to changecolour from a pH value of 5 to a pH value of 3 shall be measured,or the test continued for the specified duration without thecolour change occurring. The colour change point shall be consi-dered to have been reached when the red colouring of theuniversal indicating paper characteristic of a @H value of 3 is justbecoming visible. The universal indicating paper shall berenewed ( especially for long duration stabilities ) ‘towards theend of the expected test time every 5 to 10 min, so that thechange point is better visible.

B-3. Evaluation

B-3.1 The average value of the thermal stability times of the three samples shall not be lower than the value specified in Table 1 or Table 2 asapplicable.

12

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Printed at Simco Printing Press, Delhi

AMENDMENT NO. 1 APRIL 1985

T OIS:5831 -1984 SPECIFICATION FOR PVC INSULATION

AND SHEATH OF ELECTRIC CABLES

(First Revision)

[Page 5, Table 1, SZ No,(v), itm (a)] - Insertthe following after this iten:

‘(1) (2) (3) (4) (5) (6) (7)

b) Loss of m&cm2 2 - - Imass,MZX

[Page 6, Table I, SZ No, (vi), itm (b), firstcase, 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°.

fop,kTge 11, clause A-l, line 1) - Substitute 'cut'

I 0

(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 PVCINSULATION A ND SHEATH OF ELECTRIC CABLES

( Puge 4, clmse I.2 ) -- Add the following matter between ‘TypeC’ and ‘Type ST1 :

‘Type II General purpose insulation for maxiinum rated conduc-tor temncruture 70’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 flexibleat maximum rated conductor tem-

‘_I.. ! ‘/ I able 1 ( C’onriftued ) ‘I’nhle I ( Ch-_ a- .._-- -... ._

Upi1 1 ype of III~ullltlOll RI No. Tea, -.-

( I ) f!)iv ) Af ter agcinl in ait oven

{

IclllpcI;llurc

‘4 ,‘* n) Trcnlmcnl ( tnlcrawe f 2°C )Dur:ltion

I h) Trn*ilc strength

/ I ) Valua ofltr~a~csit~g. Afln: 2) Variation. Ai8.r 1’

I!) Elongalion 1; blc;lkI) Vnluc alter nl:uinl~, AfIn

,2) Variation, dfw

7) Losvotninss i n u i r oven *’ .; .

’ I

VI)

vii)

..__

I’ TeniperaturcR) TMtdcnt ( tolcrnnce f’ 2°C )

1 Ihr:iliorib) L o s s o f ntass. ,Ifax '

1lOt dCfOfIlh7tfdl ICSt

a) Test tcmpcr:il~~rc( lolcrluce f 2X’ )

b\ Tinlr nnder land ( .le~’ Note 2 )1) Firal case2) scconh CnFC

C) Depth of lllde~~lilli()ll. hfo.r

Hear shock testr Terr~pc~;~lurc

tolerance f 2°C). . .

” ‘-b) Visual cxnniinnjiou

(3)

0 ,c

Ch)3

N/IIWP

prrccnt

pcrccnl

pcrccnf

“C, ,I’

tl3ys

mg/cm*

“(’; 2:

bows

IloIlrs

pcrccnt

“C

how_ _ _

.’

x) C~~d,i~l~c~ test ( for dimueter> 12‘5 111111 )n) Test tcIIlpcrntlIlc ( IOICIilIlCC

0.c

* 2°C)

b) Visual cxaniinntiorr-

2

. . ,

EO

7

2

!\(I

4

65

I 50

JNo signs ol cracks

or scales

150

156

-15

No signs of cr.tckc 01scnlcs

No signs of’ cracks orSCillhJ

c

xii)

?tiii)

xiv)

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(1)xi)

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