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IS : 1554 Part 1 ) - 1988I ndian St andard

SPECIFICATION FORPVC INSULATED HEAVY DUTY )ELECTRIC CABLESPART 1 FOR WORKING VOLTAGES UP TO AND INCLUDING 1 100V

Third Revi si onThird Reprint SEPTEMBER 1993

UDC 621315211 : 62131561696 [ 67874322 ]

Q Copyright 1989BUREAU OF INDIAN STANDARDSMANAK BHAVAN 9 BAHADUR SHAH ZAFAR MARG

( Reaffirmed 1999 )

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IS : 1554 ( Part: 1 )-- 1988I ndian St andard

SPECIFICATION OR. PVC INSULATED HEAVY DUTY)ELECTRIC CABLES

PART 1 FOR WORKING VOLTAGES UP TO AND INCLUDING 1 1OOVThird Revi si on

0 FOREWORD0.1 This Indian Standard ( Third Revision ) wasadopted by the Bureau of Indian Standards on 25August 1988, after the draft finalized by PowerCables Sectional Committee had been approvedby the Electrotechnical Division Council.0.2 The current ratings of cables with genera1purpose insulation covered in this standard aregiven in IS : 3961 ( Part 2 )-1967*. The currentratings of HR PVC cables are under preparation.0.3 The current ratings of the cables covered byii7;tandard are covered m IS : 3961 ( Part 2 )-.0.4 The short circuit ratings of cables covered bythis standard are under preparation.0.5 Work is being taken up separately to identifyrequirements and tests for tie retardant lowsmoke ( FRLS ) cables. It is intended to bringout these requirements either as a separate

*Recommended current ratings for cables: Part 2PVC-insulated and PVC-sheathed heavy duty cables.

0.6 In the preparation of this standard, assistancehas been derived from the following:a>EC Pub 502 ( 1983 ) Extruded soliddielectric insulated power cables for ratedvoltage from 1 kV up to 30 kV. Interna-tional Electrotechnical Commission.b) BS 6346 : 1969 PVC insulated cables forelectricity supply * British StandardsInstitution.

standard or through an amendment to thisstandard at a later date.

0.7 For the purpose of deciding whether a parti-cular requirement of this standard is compliedwith, the final value, observed or calculated,expressing the result of a test, shall be roundedoff in accordance with IS : 2-1960*. The numberof significant places retained in the rounded offvalue should be the same as that of the specifiedvalue in this standard.*Rules for rounding off numerical values ( revised ).

SECTION 1 GENERAL earthed or unearthed ) systems for rated volt-ages up to and including 1 100 V. These cables1. SCOPE may be used on d.c. systems for rated voltages upto and including 1 500 V to earth.1.1 This standard ( Part 1 > covers requirementsand tests for armoured and unarmoured single-core, twin-core, three-core and multi.-core PVCinsulated and sheathed cables for electric supplyand control purposes.

NOTE The cables conforming to rhis stalidardmay be operated continuot:sly at a power frequencyvoltage up to 10 percent higher than the ratedvoltage.

1.2 The cables covered in this standard are suit- 1.3 The cables covered in this standard are sui-able for use on ac single phase or three phase table for use where the combination of ambienttemperature and temperature rise due to load

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IS : 1554 Part 1 ) - 1988results in conductor temperature not exceedingthe following:Type of Insulat ion Normal ShortContinuous Circui t

Operation ConditionGeneral purpose 70C 160CHeat resisting 85C 160CThe selection of type of insulation rests with thepurchaser.1.4 Armoured cables specified in this standardare suitable for use in mines also. However, forsuch cables, additional requirements have beenincluded wherever necessary [ see 3.1.1, 13.5.2,15.3(c) and 17.2 1.

4.1.1. General Pur jose I nsulaii on - The insula-tion shall be of Type A PVC compound conform-ing to the requirements of IS : 5831-1984*. ;4.1.2 Heat Resisti ng I nsulat ion - The insulationshall be of Type C PVC compound conformingto the requirements of IS : 5831-1984*.

5. FILLER AND INNER SHEATH5.1 The filler and inner sheath shall be of thefollowing:

a) Unvulcanized rubber, orb) Thermoplastic materiaIs, orc) Proofed tape ( for inner sheath only ).

2. TERMINOLOGY 5.2 Unvulcanized rubber2.0 For the purpose of this standard, the follow- thermoplasticmaterial used shall not be hard: than PVC useding definitions in addition to those given inIS : 1885 ( Part 32 )-1971*, shall apply. for insulation ( 4.1 ) and for outer sheath ( 7.1 ).The materials shall be chosen to be compatible2.1 Routine Tests - Tests made by the manu- with temperature ratings of the cable and shallfacturer on all finished cable lengths to demon- have no deleterious effect on any other componentstrate the integrity of the cable. of the cable .2.2 Type Tests - Tests required to be madebefore supply on a general commercial basis atype of cable in order to demonstrate satisfactoryperformance characteristics to meet the intendedapplication.

NOTE- These tests are of such a nature thatafter they have been made, they need not berepeated unless changes are made in the cable mnte-rials or design which might change the performancecharacteristics.

2.3 Acceptance rests - Tests carried out onsamples taken from a lot for the purpose ofacceptance of the lot.2.4 Optional Tests - Special tests to be carriedout when required, by agreement between thepurchaser and the supplier.

SECTION 2 MATERIALS3. CONDUCTOR3.1 The conductor shall be composed of plaincopper or aluminrum wires complying withIS : 8130-1984t.

3.1.1 Mining cabl& to be used in gassy minesshall be of copper conductor only.4. INSULATION4.1 The insulation shall be in accordancewith 4.1.1 or 4.1.2, as applicable.

6. ARMGURING6.1 Armouring shall be of the following:

a) Galvanized round steel wire,b) Galvanized steel strip, orc) Any metallic non-magnetic wire/strip.

6.2 The galvanized steel wires/strips shall compIywith the requirements of IS : 3975-1979t. Therequirements of non-magnetic material shall beas agreed to between the purchaser and thesupplier.7. OUTER SHEATH7.1 The outer sheath shall be in accordancewith 7.1.1 or 7.1.2, as applicable.

1.1.1 For Cables w it h General Purpose I nsuI a-f ion - The outer sheath shall be of Type ST 1PVC compound conforming to the requirementsof IS : 5831-1984*.7.1.2 For Cables w it h Heat Resisti ng I nsuIa-

l i on - The outer sheath shall be of Type ST 2PVC compound conforming to the requirementsof IS : 5831-1984*.*EIectrotechnkal vocabulary: Part 32 Cables, *Specification for PVC insulation and sheath ofconductors and accessories for electricity supply. electric cables (jirsr revision ).@pecification for c&ductors for insulated electric

cables and flexible cords (firsr revision ).tspecification for mild steel wires, strips and tapes

for armouring of cables (first revision ).2

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IS : 1554 ( Part 1 ) - 1988SECTION 3 CONSTRUCTION TABLE 2 THICKNESS OF INSULATION

8. CONDUCTOR [ Clauses 9.2, 9.3 a@ 15.1 c) ]8.1 The construction of conductor shall be as ~ ~/&~.~~follows:Nominal Copper Cross-mmz SectionaAluminiummm

Solid/ FlexibilityStranded Class Refto IS : 8130-1984*- 15 Solid Class 1

15 to 6 25 to 10 Solid/ Class 1stranded for solidClass 2for stranded10 and 16 and Stranded Class 2

above above8.2 Cables with reduced neutral conductor shallhave sizes as given in Table 1.

(1mm21525

46

101625355070

TABLE 1 CROSS SECTIONAL AREA OF REDUCEDNEUTRAL CONDUCTORSNOMINALCROSSSECTIONAL CROSS SECTIONAL REAAREA OF MAINCONDUCTOR OFREDUCEDNEUTRALCONDUCTOR

(1) (2)mmr mm*

25 1635 1650 2570 3595 50

120 70150 70185 95240 120300 150400 185500 240630 300

9. INSULATION9.1 The conductor shall be provided with PVCinsulation applied by extrusion.9.2 Thickness of Insulation - The average thick-ness of insulation shall be not less than thenominal value ( ii ) specified in Table 2.

*Specification for conductor for insulated electiiccables and flexible cords (first revision ).

95120150185240300400500630800

1 000

NOMI~L THICKNESSOFINFLATION

I --Single Co&c,gg+

Single CoreUnarmouredand Multi-core Cables(2) (3)mm mm11 0812 0913 1013 1 013 1013 1015 1215 1217 1417 1419 1619 1621 1823 2025 2227 2430 2634 3039 3439 3439 34

9.3 Tolerance on Thickness of Insulation - Thesmallest of the measured values of thickness ofinsulation shall not fall below the nominal value(ii in mm ) specified in Table 2 by more than 01mm SO.1 f i9.4 Application of Insulation - The insulationshall be so applied that it fits closely on theconductor and it shall be possible to remove itwithout damage to the conductor.10. CORE IDENTIFICATION10.1 Cores shall be identified by different colour-ing of PVC insulation by adopting the followingscheme:

a) 1 Core : red, black, yellow, blue or naturalI . .( non-plgmented 1;b) 2 Cores : red and black;c) 3 Cores : red, yellow and blue;

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IS : 1551 (Part 1 ) - 1988d) 4 Cores : red, yellow, blue and black;e) 5 Cores : red, yellow, blue, black and grey;andf) 6 Cores and above : Two adjacent cores( counting and direction core ) in eachlayer, blue and yellow, remaining coresgrey, or in accordance with the schemegiven in 10.3.

10.2 For reduced neutral conductors, the insula-tion colour shall be black.10.3 For cables having more than 5 cores, as analternate to the provisions of 10.1, the coreidentification may be done by numbers. In thatcase, the insulation of cores shall be of the samecolour and numbered sequentially, starting withnumber 1 for the inner layer. The numbers shallbe printed in Hindu-Arabic numerals on the outersurface of the cores. All the numbers shall be ofthe same colour which shall contrast with thecolour of the insulation. The numerals shall belegible.

10.3.1 Ar rangement @-M ark ing - The numbersshall be repeated at regular intervals along thecore; consecutive numbers being inverted inrelation to each other.When the number is a single numeral, a dashshall be placed underneath it. If the numberconsists of two numerals, these shall be disposedone below the other and a dash placed below thelower numeral. The spacing d between consecutivenumbers shall not exceed 50 mm. The arrange-mcnt of the marks Is shown in Fig. 1,

11. LAYING UP OF CORES11.1 In twin, three-and multi-core cables. thecores shall be laid up together with a suitableLly; the outermost layer shall have right-handlay and the successive layers shall be laid withopposite lay; where necessary, the interstices shallbe tilled with non-hygroscopic material.11.2 The recommended plan for lay-up of coresup lo 100 is given in Table 3.12; INNER SHEATH12.1 The laid up cores shall be provided withinner sheath applied either by extrusion or by

r d 1

wrapping. It shall be ensured that the shape is ascircular as possible.12.2 The inner sheath shall be so applied that itfits closely on the laid up cores and it shall bepossible to remove it without damage to theinsulation.12.3 Thickness of Inner Sheath - The thicknessof the inner sheath shall be as given in Table 4.Single core cables shall have no inner sheath.

12.3.1 When one or more layers of bindertapes are applied dver the laid up cores, thethickness of such tapes shall not be construed aspart of the inner sheath.13. ARMOURING13.1 Application

13.1.1 Armouring shall be applied over theinsulation in case of single core cables and overthe inner sheath in case of twin-, three-and multi-core cables.13.1.2 The armour wires/strips shall be appliedas closely as practicable.13.1.3 The direction of lay of the armour shallbe left hand. For double wire/strip armouredcables, this requirement shall apply to the innerlayer of wires/strips. The outer layer shall, exceptin special cases, be applied in the reverse thedirection to the inner layer and there shall be aseparator of suitable non-hygroscopic material,such as, plastic tape, bitumenized cotton tape,bitumenized hessian tape, rubber tape, proof tape,etc, between the layers of armour wires/strips.13.1.4 A binder tape may be provided on thearmour.

13.2 Type of Armour - Where the calculateddiameter below armouring does not exceed 13mm, the armour shall consist of galvanized roundsteel wires. Where the calculated diameter belowarmouring is greater than 13 mm, the armourshall consist of either galvanized round steelwires or galvanized steel strips.13.2.1 In the case of single core cables intendedfor use on a.c. systems, the armouring shall beof non-magnetic material.

e-Ht-- PFIG. 1 CORE IDENTIFICATION BY NUMBERS

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Is:1554 Partl)-1988TABLE 3 LAY-UP OF CORES

go y(1)23456789

1011121314151617181920212223242526272829303132333435

LAY-UP

(2)23456

l-61-7l-82-83-83-93-104-10S-105-115-12O-6-12l-6-1 2l-7-12l-7-132-7-132-8-li?-8-142-8-153-9-143-9-153-9-164-10-154-10-164-10-l 75-11-165-11-175-11-18S-12-18

No. OPCORES(1)

36373839404142434445464748495051525354555657585960616263646566676869

Clause 11.2LAY-UP

(2)O-6-12-18l-6-12-18l-6-12-19l-6-13-19l-7-13-19l-7-13-202-8-13-192-8-14-192-8-l 4-202-8-14-213-9-l 4-203-9-l S-203-9-15-213-g-15-223-9-16-224-10-16-214-10-16-224-10-i 6-234-10-17-234-l l-17-23S-11-17-235-11-17-24S-11-18-245-12-18-24O-6-12-18-24l-6-12-18-24l-6-12-18-251-7-12-18-251-7.13-18-25l-7-13-19-25l-7-13-19-262-8-13-19-252-8-14-19-252-8-14-20-25

No. OFCORES(1)

707172737475767778798081828384858687888990919293949596979899

100

LAY-UP

(2)2-8-14-20-262-8-14-20-272-8-14-21-273-9-l S-20-263-9-15-21-263-9-15-21-273-9-15-21-283-9-l 5-22-284-10-15-21-284-10-16-22-274-10-16-22-284-10-16-22-294-10-16-23-294-10-17-23-29S-11-17-23-285-l l-17-L3-295-l I-17-23-305-11-17-24-30S-11-18-24-30o-6-11-18-24-30o-6-12-18-24-30l-6-12-18-24-30l-6-12-18-24-31l-6-12-18-25-31I-6-12-19-25-31l-6-13-19-25-31I-7-13-19-25-31l-7-13-19-26-312-8-13-19-25-312-8-14-19-25-312-8-l 4-20-25-3 1

NOTES - The figures indicate the number of cores in each successive layer, for example, 5-11-18 means,5 cores in the first, 11 cores in the second and 18 cores in the third layer, etc.NOTES - This table is for guidance only.

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TABLE 4 THICKNESS OF INNER SHEATH( c1l7uses 12.3 and 15.1( c ) ]

All dimensions in millimetres.CAIAXJ LATED IAMETEROVER THICKNESS PLAID up CORES INNER SHEAR[ REPIS : 10462 ( PART 1 )-1983* ] MINIMUM

Over ,up to andIncluding(1) (2) (3)- 2s 03

25 35 0435 45 0545 55 0655 - 07*Fictitious calculation method for determinationof dimensions of protective coverings of cables:;;;iesl Elastomeric and thermoplastic insulated

13.3 Dimensions - The dimensions of galvanizedsteel wires and strips shall be as specified inTable 5.TABLE 5 DIMElVSIONS OF ARMOUR - ROUNDWIRES AND STRIPS

All dimensions in millimetres.CALCULATED;DIAMETERUNDER ARMOURt REF IS :\10462PART l )-1983 ]

--- Over Up to andincluding1) 2)

a) For all diameters inexcess of 13or

b) - 1313 2525 4040 5555 7070 -

NOMINAL NOMINALTHICKNESS DIAMETEROF STEEL 0~ ROUNDSTRIP WIRt?

(3) (4)08 -

- 1408 1608 20014 250

14 31514 400NOTE - (a) and ( b) indicate the methods ofpractice in the application of armouring.

*Fictitious calculation method for determinationof dimensions of protective coverings of cables: Part1 Elastomeric and thermoplastic insulated cables.13.4 Joints - The joints in armour wires/stripsshall be ma& by brazing or welding and thesurface irregularities shall be removed. A joint inany wire/strip shall be at least 300 mm from thenearest joint in any other wire/strip in thecompleted cable.

NOTE- In case of multi-core unarmoured cables,it is permissible to supply the inner and outersheaths in a single extrusion out ofthe materialintended for outer sheath. The thickness of suchextruded sheath shall be not less than the sum of theinner sheath thickness specified in Table 4 and thenominal outer sheath thickness specified in co1 3 ofTable 7 and the smallest of the measured valuesshall not be less than the sum of the inner sheaththickness soecified in Table 4 and the minimumvalue of oiter sheath thickness specified in co1 4 ofTable 7.

13.5 Resistance

14.4.2 Armoured Cables - The minimumthickness of FVC outer sheath of armoured cablesshall not fall below the nominai value ( ts ) speci-fied in Table 7 by more than O-2 mm i 02 tS.13.5.1 If specified by the purchaser, the d.c.

resistance of the galvanized steel wire/strip *Specification for conductor for insulated electriczables and flexible cords (first revision ).

armour shall be measured. The result, whencorrected to 2OC, shall comply with the appro-priate values given in Table 6.13.5.2 In case of cables for use in mines, theresistance of armour shall not exceed that ofthe conductor as specified in IS : 8130-1984* bymore than 33 percent. To satisfy this, substitu-tion of galvanized steel wires/strips in armburingby the required number of tinned copper wires/strips is permissible.

14. OUTER SHEATH14.1 The outer sheath shall be applied byextrusion. It shall be applied:

a) over the insulation in case of unarmouredsingle-core cables;

b) over the inner sheath in case of unarmouredtwin, three-and multi-core cables; andc) over the armouring in case of armouredcables.

14.2 The outer sheath shall be so applied that iffits closely over insulation inner sheath/armouring.It shall be possible to remove it without damageto the insulation/inner sheath.14.3 The colour of the outer sheath shall beblack, unless any other colour is agreed to bet-ween the purchaser and the supplier.14.4 Thickness of Outer Sheath

14.4.1 Unarmowed Cables - The averagethickness of PVC outer She&h of unarmouredcables shall be not less than the nominal valuespecified under co1 3 of Table 7 and the smallestof the measured values shall not be less than theminimum value specified in co1 4 of Table 7.

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TABLE 6 ARMOUR RESISTANCE OF CABLESNOMINALARE.4 OF ,

( CI ause 13.5.1 )MAXIMUM .c. RESISTANCE F ARMOUROF CABLEAT 20C* 1CONDUCTOR Two Core Three Core* I - L

(1) (2)mm2 ohm/km

15 63725 5.544 4836 440.

10 38616 28525 277

4 35 2-6150 226IO 20495 141

120 130150 119185 108240 0749300 0684400 0464500 0397630 0274

Roundwire Strip4.0 x 0.8 61 x I.4 mm mm(3) (4)

ohm/km ohm/km

- -- --- -

469 -458 -441 -373 -336 -295 -271 -249 -226 -138 1081.80 0990156 0860133 0734117 0651

Roundwire

(5)ohm/km

602522454414362267249235203141122111100073306420586040803590248

Strip ar A_4.0 x 0.8mm(6)

ohm/km-----440411388335296254232209193169154136120106

6.1 x 1.1mm(7)

ohm/km------------

10609300850075506630589

Four Coref

Four Core wi:zeduced NeutralStrip Round .Round Strip wire

(8)ohm/km

55247741437628424221419913911810509620703062305630389036102330203

4% x 0.8 A6.1 x 1.4mm mm(9) (10)

ohm/km ohm/km- -

-- --468 -399 -353 -328 -292 -247 -218 -201 -186 102164 0902148 0816130 0719120 06660992 05520861 0480

wire _ 40 x 0.8mm(11) (12)

ohm/km ohm/km- -- --

61 x 1?4mm(13)

ohm/km

-- -

-221 364205 338184 304123 257110 239105 2200959 2000684 1800596 1560429 1440367 1220264 1130227 0967

----

------

099008630793

z0679 . .0627 t:0538 2hNOTE l- The resistance of armour for single core cables has not been covered since such cables are generally armoured with non-magneticmaterials ( see 13.2 ). 2

Nom2- The resistance of the armour may be measurea at room temperature and corrected to 20C by means of correction factors given in XIS : 10810 ( Part 42 )-1984*. YV*Methods of tests for cables: Part 42 Resistivity test of armour wires and strips and conductance test of armour wires/str ips.

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W:1554(ParCl)-1988

TABLE 7 THICKNESS OF OUTER SHEATH

CALCULATED DIAMETERUNDER THE OUTER SHEATH1 REP IS : 10462 PART 1 ) - 1983* ], * 1Over Up to andIncluding

(I) (2) (5)15 1.2415 25 1.4025 35 1.5635 40 1.7240 45 1.8845 50 2.0450 5s 3.0 2.20 22055 60 3.2 2.36 2.3660 6S 3.4 2.52 2.5265 70 3.6 2.68 26870 75 3.8 2.84 2.8475 4.0 3.00 3.00*Fictitious calculation method for determination of dimensions of protective coverings of cables: Part 1Elastomeric and thermoplastic insulated cables.

THICKNESSOF OUTERSHEATHFORUNARMOUREDCABLES-- 7Nominal Minimum(3) (4)1.8 1.242.0 1.402.2 1.562.4 1.722.6 1.882.8 2.04

MINIMUM THICKNESSOF OUTER SHEATH

FOR ARMOUREDCABLES

[ Clauses 14.4.1, 14.4.2 and 15-l(c) ]All dimensions in millimetres.

SECTION 4 TESTS15. CLASSIFICATION OF TESTS

15.1 Type Tests - The fo l lowing shall constitutetype tests:

Tests

a) Tests on conductor:1) Annealing test ( for copper )2) Tensile test ( for aluminium )3) Wrapping test ( for aluminium 14) Conductor resistance test

b)44

Ear Requi rement s,Ref to

IS : 8130-1984fIS : 8130-1984tIS : 8130-1984tIS : 8130-1984t

For Test M ethod,Ref to Part No. of

IS : 10810*1235

Test for armouring wires/stripsTest for thickness of insulationand sheath

Table 5 andIS : 3975,.19799, 12, 14,Table 2, Table 4and Table 7

36 to 426

Physical tests for insulation andouter sheath:1) Tensile strength and elongation IS : 5831-19849 7at break2) Ageing in air oven IS : 5831-19841 113) Shrinkage test IS : 5831-1984s 124) Hot deformation IS : 5831-19848 15

*Methods of test for cables.t8pecification for conductors for insulated electric cables and flexible cords ( first revision ).tspecification for mild steel wires, strips and tapes for armouring of cables (first revision ).gSpeci6cation for PVC insulation and sheath of electric cables ( irst revision ).

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IS : 1554 ( Part 1 ) - 1988

Tests For Requi rements,Ref to For Test M ethod,Ref to Part No. ofI S 10810*5) Loss of mass in air oven IS : 5831-1984t 106) Heat shock test IS : 5831-1984t 147) Thermal stability IS : 5831-19847 See Note

e) Insulation resistance test IS : 5831-1984t 43f) High voltage test ( water 163 45immersion test )g) High voltage test at room 162 45temperatureh) Flammability test 164 53NOTE -Under preparation. In the meantime, test method in IS : 5831-1984t shall be followed.

*Methods of test for cables.tSpecification for PVC insulation and sheath of electric cables (fj rst revision ).

15.2 Acceptance Tests - The following shallconstitute acceptance tests:a) Annealing test ( for copper ),b)c)d)4f)g)h)

Tensile test ( for aluminium ),Wrapping test ( for aluminium ),Conductor resistance test,Test for thickness of insulation and sheath,Tensile strength and elongation at breakof insulation and sheath,Insulation resistance test, andHigh voltage test at room temperature.

15.2.1 A recommended sampling plan foracceptance tests is given in Appendix A.15.3 Routine Tests - The following shall consti-tute routine tests:

a)b)

Conductor resistance test,High voltage test at room temperature,and

c) Armour resistance test ( forcables ). mining15.4 Optional Tests - Theconstitute optional tests: following shall

a) Cold bend test,b) Cold impact test, andc) Armour resistance test ( for other thanmining cables .

16. DETAILS OF TESTS16.1 General - Unless otherwise stated, thetests shall be carried out in accordance with theappropriate part of IS : 10810*; taking intoaccount additional information given in thisstandard.16.2 High Voltage Test at Room Temperature -The cable shall withstand an a.c. voltage of 3 kV( rms ) or a dc voltage of 72 kV. The durationof test shall be 5 minutes for each connection.16.3 High Voltage Test ( Water Immersion Test )

16.3.1 a.c. Test - The core or cores ( notexceeding five cores in the case of multicorecables ) shall be carefully removed from a sampleapproximately 3 m long taken from the finishedcable. They shall be SO immersed in water baththat their ends protrude at least 200 mm abovethe water level. The temperature of the waterbath shall be 6Oi:3C for cores with generalpurpose PVC insulation and 70-&3C for coreswith heat resisting PVC insulation. After 24hours, a voltage of 3 kV ( rms ) shall be appliedbetween the conductors and water. This voltageshall be raised to 6 kV ( rms ) within 10 secondsand held constant at this value for 5 minutes. Ifthe sample fails in this test, one more sampleshall be subjected to this test. There shall be nofailure in the repeat test.

16.3.2 d.c. Test - The cores which have passedthe preliminary test in 16.3.1 shall be subse-quently tested with a d.c. voltage of 12 kV in thesame water bath at the same temperature. Thecore shall withstand this voltage for 240 hourswithout breakdown.NOTE-The selected cores shall represent allcolours included.

*Methods of test for cables.9

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IS : 1554 ( Part 1) - 198816.4 Flammability Test - Period of burning afterremoval of the flame shall not exceed 60 secondsand the unaffected ( uncharred ) portion from thelower edge of the top clamp shall be at least50 mm.SECTION 5 IDENTIFICATION, PACKINGAND MARKING17. IDENTIFICATION17.1 Manufacturers Identification - The manu-facturer shall be identified throughout the lengthof the cable by means of a tape bearing themanufacturers name or trade-mark, or bymanufacturers name or trade-mark being indent-ed, printed or embossed on the cable. In casenone of these methods can be employed, or if thepurchaser so desires, colour identification threadsin accordance with a scheme to be approved bythe Bureau of Indian Standards shall be employ-ed. The indentation, printing or embossing shallbe done only on the outer sheath.17.2 Cable Identification - In order to distin-guish these electric cables from telephone cables,the word ELECTRIC shall be indented, printedor embossed throughout the length of the cable.In case of cables intended for use in mines, theword MINING also shall be indented, printedor embossed throughout the length of the cable.The indentation, printing or embossing shall bedone only on the outer sheath.

17.2.1 Cables with heat resisting insulationsuitable for 85C conductor temperature shall beidentified by the letters HR 85 marked on it inany of the manner specified in 17.2.17.3 Cable Code - The following code shall beused for designating the cable:

ConstituentAluminium conductorPVC insulationSteel round wire armourSteel strip armour

Code Letter

WSteel double round wire armour WwSteel double strip armour FFPVC outer sheath Y

NOTE - No &ode letter for conductor is requiredwhen the conductor material is copper.18. PACKING AND MARKING18.1 The cable shall be wound on a drum ( tee

IS : 10418-1972* ) of suitable size and packed.The ends of the cable shall be sealed by means ofnon-hygroscopic sealing material.18.2 The cable shall carry the following informa-tion stencilled on the drum:

a) Reference to this Indian Standard, forexample, Ref IS : 1554 ( Part 1 );b)c)d)4f)8)h)3k)4dP)4)

Manufacturers name, brand name ortrade-mark;Type of cable and voltage grade;Number of cores;Nominal cross-sectional area of theconductor;Cable code;Colour of cores ( in case of single corecables );Length of the cable on the drum;Number of lengths on drum ( if more thanone );Direction of rotation of drum ( by meansof an arrow );Approximate gross mass;Running end of cable;Country of manufacture; andYear of manufacture.

18.2.1 The cable ( drum ) may also be markedwith the Standard Mark.NOTE- The use of the Standard Mark is governedby the provisions of the Bureau of Indian StandardsAct 1986 and the Rules and Regulations madethereunder. The Standard Mark on products coveredby an Indian Standard conveys the assurance thatthey have been produced to comply with therequirements of that standard under a well definedsystem of inspection, testing and quality controlwhich is devised and supervised by BIS and operatedby the producer. Standard marked products are alsocontinuously checked by BIS for conformity to thatstandard as a further safeguard. Details of condi-tions under which a licence for the use of the

Standard Mark may be granted to manufacturers orproducers may be obtained from the Bureau ofIndian Standards.

*Specification for drums for electric cables.

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APPENDIX A( Clause 152.1 )

IS : 1554 ( Part 1) - 1988

SAMPLING OF CABLESA-I. LOTA-l.1 In any consignment, the cables of same sizemanufactured under essentially similar conditionsof production shall be grouped together to consti-tute a lot.

A-2.2.1 In order to ensure the randomness ofselection, random number tables shall be used (seeIS : 4905-1968* ).A-3. NUMBER OF TESTS AND CRITERIONFOR CONFORMITY

A-2. SCALE OF SAMPLINGA-2.1 Samples shall be taken and tested fromeach lot for ascertaining the conformity of the lotto the requirements of the specification.A-2.2 The number of samples to be selected shalldepend on the number of drums in the lot asindicated below. These samples shall be taken atrandom:Number of. Dr ums Number of Drums Permissiblein th,e Lot to be Taken Number ofas Sample Defectives

N n a

A-3.1 Suitable length of test sample shall be takenfrom each of the drums selected. These testsamples shall be subjected to each of the accep-tance tests ( see 15.2 ). A test sample is calleddefective if it fails in any of the acceptance tests.If the number of defectives is less than or equalto the corresponding permissible number givenin A-2.2 the lot shall be declared as conforming tothe requirements of acceptance tests; otherwisenot.

101 to 300 :o 0301 to 500501 and above 32 : *Methods for random sampling.

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Bureau of Indian StandardsBIS is, a statutory institution established under the Bureau of /n an Sandards Act 1986 to promoteharmonious development of the activities of standardization, marking and qualitycertification ofgoods and attending to connected matters in the country.CopyrightBIS has the copyright of all its publications. No part of these publications may be reproduced inany form without the prior permission in writing of BIS. This does not preclude the free use, in theourse of implementing the standard, of necessary details, such as symbols and sizes, type or gradedesignations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Revision of Indian StandardsIndian Standards are reviewed periodically and revised, when necessary and amendments, if any, areissued from time to time. Users of Indian Standards should ascertain that they are in possession ofthe latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving thefollowing reference:

Amca$ments Issued Since PublicationAanend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDSHeadquarters IManak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002Telephones : 331 01 31, 331 13 75 Telegrams : Manaksanstha( Common to all Offices )Regional Offices : TelephoneCentral : Manak Bhavan, 9 Bahadur Shah Zafar MargNEW DELHI 110002Eastern : l/14 C. I. T. Scheme VII M, V. I. P. Road, ManiktolaCALCUTTA 700054

r331 01 311331 137537 86 62

Northern : SC0 445-446, Sector 35-C, CHANDIGARH 160036 53 38 43Southern : C. I.T. Campus, IV Cross Road, MADRAS 600113 2350216Western : Manakalaya, E9 MIDC, Marol, Andheri ( East )BOMBAY 400093 632 92 95

Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE.FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR.PATNA. TRIVANDRUM.

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AMENDMENT NO. 1 JUNE 1994TOIS 1554 ( Part 1) : 1988 SPECIFICATION FOR PVCINSULATED ( HEAVY DUTY) ELECTRIC CABLESPART 1 FOR WORKING VOLTAGES UP TO AND

INCLUDING 1 iO0 V( Third Revision)

( Page 1, clause 0.3 ) - Delete this clause and renumber the subsequentclauses.(Page 1, clause 0.5 ) -Substitute the following for the existing clause:

0.4 A special category of cables with improved fire performance has beenincluded in this staudard. Classification of such cables is given in Appendix A.

( Puge 1, c/ruse 1.1 ) - Insert the following new clause 1.2 after 1.1 andrenumber the subsequent clauses:1.2 This standard also covers cables with improved fire performance,categories Cl and C2, as given in Appendix A. For such cables additionalrequirements have been included wherever necessary in 7.13, 15.1.1, 15.2.1 and17.2.2 ).

NOTE - Normal cables IO this standard can be classified as meeting the requirements ofcategory 01.

1 Page 2, clurrse 6.1 (b) ] - Substitute formed wirefor strip.( Purge , clause 6.2 ) - Replace first sentence by the following:

The galvanized steel wires/formed wires/tapes shall comply with therequirements of IS 3975 : 1988, except that the provisions of 3.3.1 and 3.33 ofIS 3975 shall not apply.( Page 2, clause 7.1.2 ) - Insert the following new clause 7.13 after 7.13:

7.1.3 For cables with improved fire performance, the outer sheath shall, inaddition, meet the requirement of tests applicable for the required category(see 15.1.1 and 15.2.1).Gtl 1

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( Page 3, clause 8.1,Informalable, captions for co1 1 and 2 ) - Substitutethe following for the existing:

Nominal Cross SectihaIAreaI I

tippermm2Aluminium

mm2( Page 4, clause 10.3.1, para 2 ) - Delete letter d in line five; also delete

the last sentence.(Page 4, Fig. 1 ) - Delete.( Page 6, clause 14.4.2 ) - Substitute the following for the existing:

14.4.2 Armoured Cables - The thickness of outer sheath shall be not less thanthe minimum value specified in co1 5 of Table 7.

(Page 8, clause 15.1 ) - Insert the following new clause 15.1.1 fter 15.1:15.1.1 The following shall constitute additional type tests for cables withimproved fire performance as per the categories given in Appendix A:Category

(1)01Cl

Tests

(2)No Additional testsa) Oxygen index test6) Flame retardance

test on single cablec) Flame retardance

test on bunched cables

c2

d) Temperature index

a) Oxygen index testb) Flame retardance

test on single cablec) Flame retardance

test on bunched cables

For require- For Test Methods, Ref.ment, Ref Part No. of IS loSl0

(3) (4)- -16.5 58 (Under preparation)16.6 61

16.7

16.10 Under consideration

16.5 58 (Under preparation)16.6 61

16.7

2

62

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4 Test for specificoptical density of smoke40

Smoke densityTest for halogen acidgas evolution

d Temperature indexNOTES

16.8

16.11

16.9

16.10

Under Consideration

63

59 ,,.

Under consideration

1. For category Cl, tests (a) and (d) are to be performed onsamples taken from outer sheath, as applicable, and prepared in the manner given in therelevant test method.2. For categpry C2, tests (a), (e), (f) and (g) are to be performed on samples takenfrom outer sheath, as applicable, and prepared in the manner given in the relevant testmethod.

( Page 9, clause 15.2 ) - Add clause 152.1: and renumber the existingclause as 15.2.2.15.2.1 The following shall constitute additional acceptance tests for cables withimproved fire performance as per the categories given in Appendix A:

Category Test01 No additional TestCl a)

b)c2 a)

b>4

d)

e>3

Oxygen index testFlame retardance test onsingle cableOxygen index testFlame retardance test onsingle cableTest for specific opticaldensity of smokeTest for halogen acid gasevolutionTest for smoke density

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kqsuap ayours 103wq. (auo yjoAa

~128 3e ua801eq~03 saL (PUC; CSL un sampres OItnner/outer sheath (as applicable) shall be done at27 f 2C. The oxygen index shall not be less than 29.16.6 Flutue Retatdnuea Test on Single CnblasAfter the test, there should be no visible damages on the test specimen within 300mm from its upperend. Marks from fixing devices, soot or chsnging of the colowate not considered damages.16.7 Flnae Retasdnaee Test on Buuehed CablesAfter butning has ceased; the cables should be wipe4 clean and the chatted oraffected pottion should not have reached a height exceeding 2.5 m above thebottom edge of the burner, measuted at the front and tear of the cable assembly.

NOTE Rcquiremcn~ for this test 8Ic split in 3 categories i.e. 4 B and C as described inIS 10810 ( Part 62 ) : 1993. For Ibc purpose of this standard, category B and C testmethods shall be used. la the abseace of any special requirements for method B, method Cshall bs used for bolh the calegoria Cl mndC2.

16.tt Test for Speeifk Opt al J kusity of SmokeUnder Consideration.16.9 Test for Aawn Acid Gas EvolutioaThe level of HCl evolved shall not exceed 20 percent by weight.16.N Test for Temperature Indexlbemeasured value of Temperature Index shall be 21 at a temperatureof 25OC.16.11 Smoke Dan yUnder considetation.

(Page 10, clause 17.2.1) - Add new clause:17.2.2 The following special cables shall be identified by indenting, embossingor printing the appropriate egend on the outet sheath throughout the cable length,in addition to the existing marking requirements.

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Type of Cablei) Improved fire performance

or Category Cl

LegendFR

ii) Improved fire performancefor Category C2

FR-LSH

( Pnge 11, ppendix A ) - Insert the following new Appendix A andrenumber the existing Appendix A as Appendix B:

APPENDIX A( Clauses 0.4, 1.2 and 15.1.3 )

CLASSIFICATION OF CABLES FOR IMPROVED FIREPERFORMANCE

Category01

Cl

c2

Environment Description TypeCables in open areas -

Cable DefinitionFlame retardent, Singlecable self-extinguishing,does not propagate flame

Cables in constrained areas FR Flame retardent, Does notpropagate fire even wheninstalled in groups invertical ducts

Cables in constrained areas FR-LSH Flame retardent cables withwith limited human activity reduced halogen evolution andand/or presence of sophisticated smokesystems

(ETD09) Reprography Unit, BIS, New Delhi, India