( Reaffirmed 2005 )

Indian Standard
PAPER INSULATED LEAD SHEATHED
CABLES FOR RATED VOLTAGE UP TO
AND INCLUDING 33 kV - SPECIFICATION

( Third Revision)

UDC 621*315*221*5 : 621#315,614*6

Q BIS 1994

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

April 1994 Price Group 11

 CONTENTS
Page
SECTION 1 GENERAL

1 SCOPE .. . .. . .. 1
2 REFERENCES .. . ... ... 1
3 TERMINOLOGY .. . .. . .. . 1

SECTION 2 MATERIALS

4 CONDUCTOR ... ... ... 2

5 INSULATING PAPBR . .. ... ... 2
6 SCREENINGMATERIALS .I. ... .. . 2
7 WORMING MATERIALS .. . .. . _. 2
8 COPPERWOVEN FABRIC TAPB .. . ... ... 2
9 INSULATING COMPOUND . .. ... .. 2
10 LEAD AND LEAD ALLOYS . .. ... ... 2
11 ARMOURING MATERIALS . .. .. . ... 3
12 LAPPEDBBDDING AND SERVING MATERIALS...... .. 3
13 PROTECTIVE
COMPOUND ...... ... 3
14 PVC COMPOUND ...... ... 3

SECTION 3 CONSTRUCTION

15 CONDUCTOR ... ... ...

16 SCRBENING ... ... . ..
17 CORE INSULATION .. . .. . ...
18 LAYING UP OF CORBS .. . . ..
19 IMPREGNATION ... ... .I.
20 LEAD OR LEAD ALLOY SHEATH .-. ... ...
21 BEDDING .. . .. . I..
22 ARMOUR .. . ... ...
23 SERVINGAND OVERALL SHEATH .. . .. . . ..

SECTION 4 TESTS

24 CLASSIFICATIONOF TESTS ... .. . .. . 6

SECTION 5 IDENTIFICATION, PACKING AND MARKING

25 END MARKING .. . ... .. .

26 VOLTAGE INDENTIFICATION ... .. . ...
27 MANUFACTURER’S IDBNTIFICATION ... .. . .. .
28 CABLB IDENTIFICATION .-. ... ...
29 PACKING AND MARKING .. . .., ...

SECTION 6 TABLES

TABLE 1 ;;~SIONS FORO-66/1*1 KV ( EARTHBDOR UNEARTHED) SINGLB-CORE( UNARMOURBD)

9
TABLE 2 DIMENSIONSFOR 1*9/3*5KV ( EARTHBD) SINGLE-CORE( UNARMOURBD) CABLES 10
TABLE 3 DIMENSIONSFOR 3*3/3*3KV ( UNEARTHED) SINGLE-CORE( UNARMOURED1 CABLBS 10
TABLE 4 DIMENSIONSFOR 3*8/6*6KV ( EARTHED) SINGLE-CORE( UNARMOURED) CABLES 10
TABLE 5 DIMBN~IONSFOR 6.6/6*6KV ( EARTHED) SINGLE-CORE( UNARMOURED) CABLES 10
TABJJ 6 DIRECTEDFOR 6*35/11KV ( EARTHED) SINGLE-C• RB ( UNARMOURBD) SCREENING
CABLB 11
( Continued on third cover )
 SS 692:1994

Indian Standard
PAPER INSULATED LEAD SHEATHED
CABLES FOR RATED VOLTAGE UP TO
AND INCLUDING 33 kV — SPECIFICATION
( Third Revision)
SECTION 1 GENERAL 1.3 The lead alloy sheathed wire armoured
copper conductor cable of MIND type covered
1 SCOPE by this standard may also be used in mines,
provided the combined conductance of the
1.1 This standard specifies general requirements
armour and lead alloy sheath, or in case when
and construction for impregnated paper insulat-
the purchaser so desires, the armour alone,
ed, lead sheathed cables with copper or alurni-
shall be not less than 50 percent of the largest
nium conductors having rated voltages from
copper conductor contained in the cable, with
065~1.1
kV to 19/33 kV.
a minimum of copper equivalent of 15 mm~. To
1.2 Maximum Permissible Operating Tempera- satis[y this, substitution of galvanized steel
ture wire m armouring by required number of tinned
copper wires is permissible.
T’he temperatures given in the table below are
applicable to draining impregnation rind non- 2 REFERENCES
draining impregnation and are intended as a
guide, based on values widely used, for carrYing The Indian Standards listed in Annex A are
—..
out the tests: necessary adjuncts to this standard. ‘-

Rated l’o/tage.~ of Highest Maximum Per- 3 TERMINOLOGY

Cables Voltage for m issible Conti-
Uoju Equipment rmous Conductor 3.0 For the purpose of this standard, the
~)m Temperature following definitions in addition to those given
. —..*.——= in IS 1885 ( Part 32 ) : 1971 shall apply.
Screen.ed Belted
Cables Cables 3.1 EarthedSystem
kV kv “c “c An electric system which fulfik any of the
065/1.1 1“2 —- 80 following conditions
19/3”3and 3 3,/3.3 3“6 — 80 a) The neutral point or the mid-point
3.8/6.6 and 6-6/6”6 7“2 — 80 connection is earthed in such a manner
6.35/11 and 11/11 12 70 65 that, even under fault conditions, the
maximum voltage that can occur between
12”7/22 24 65 – any conductor and the earth does not
19/33 36 65* — exceed 80 percent of the nominal system
voltage;
where
b) The neutral-point or the midpoint
U. == rated powel frequency voltage between connection is not earthed but a protective
conductor and screen or metallic device is installed which automatically
sheath for which the cable is suitable, cuts out any part of the system which
~.
= rated
accident ally becomes earthed; and
power frequency voltage between
phase conductors for which the cable c) In case of ac system only, the neutral
is suitabie, and point is earthed through and arc suppres.
sion coil with arrangements for isolation.
u. ==maximum sustained pow er frequency within one hour of occurrence of the fault
voltage between phase conductors for for the non-radial field cables and within
which the cable is suitable. 8 hours for radial field cables, provided
*For non-~rai ning type cables On!Y. The temperature that the total of such periods in a year
for draining cabies is under consideration. does not exceed 125 hours,

1
IS 692 : 1994

3.2 Unearthed System substances. It shall also be free from loading

materials and from gelatine, albumen and resin
An electric system which does not fulfil the size.
requirements of the earthed system.
5.2 The paper shall have chemical characteris-
3.3 Dimensional Values ( Thickness, Cross- tics as given in Annex B.
Section, etc )
5.3 Thickness
Nominal Values -A nominal value is a
value specified always in connection The nominal thickness of individual paper tapes
with a specified tolerance which has to be shall not exceed 0.15 mm for core insulation and
guaranteed by the manufacturer. O-2 mm for belt insulation.
b) Approximate Values - A value which is 6 SCREENING MATERIALS
neither guaranteed nor checked, and is
used, for example, for the calculation of 6.1 Carbon Paper
other dimensional values. Semi-conducting carbon paper shall be similar
cl Measured Values or Observed Values - to the insulating paper in composition and
Values resulting from measurements or blended with finely dispersed carbon during its
tests, carried out according to specified manufacture.
methods.
6.1.1 The nominal thickness shall be not less
3.4 Type Tests than 0.1 mm.
Tests required to be made before supply on a 6.2 Metallic Tape
general commercial basis of a type of cable in
It shall be a non-ferrous metal tape made of
order to demonstrate satisfactory performance
either plain annealed copper or aluminium. The
characteristics to meet intended application.
nominal thickness shall be not less than
NOTE - These tests are of such a nature that after 0.06 mm.
they have been made, they need not be repeated
unless changes are made in the cable materials or 6.3 Metallized Paper
design which might change performance characteris-
tics. It shall comprise aluminium foil bonded to insu-
3.5 Acceptance Tests lating paper. It shall be perforated to enable
mass impregnation of the cable. The thickness
Tests carried out on samples taken from a lot of such aluminium foil shall be not less than
for the purpose of acceptance of the lot. 0.01 mm.
3.6 Routine Tests 7 WORMING MATERIALS
Tests made by the manufacturer on all finished Worming materials for filling interstitches of
cable lengths to demonstrate the integrity of twin and multicore cables shall comprise paper,
the cable. cotton, jute or any other suitable materials.
They shall not have any deleterious effect on
3.7 Optional Tests other components of the cables.
Special tests to be carried out, when required, 8 COPPER WOVEN FABRIC TAPE
by agreement between the purchaser and the
supplier. Copper woven fabric tape for use as binder over
the laid up cores of screened cables shall com-
SECTION 2 MATERIALS prise cotton tape incorporating interwoven
copper wires, when applied in cables, it shall
4 CONDUCTOR ensure electrical contact between core screens
and metallic sheath.
The conductor shall be composed of plain 9 INSULATING COMPOUND
copper or aluminium wires complying with
IS 8130 : 1984. 9.1 The insulating compound for impregnation
shall be such that the finished cable complies
5 INSULATING PAPER with the appropriate requirements of this
standard.
5.1 Paper used for cable insulation shall be
uniform in texture and long fibred and shall not 9.2 The compound shall be either draining com-
contain mechanical wood pulp or esparto. The pound or cnon-draining compound’.
chemicals used in pulping, bleaching or any 10 LEAD AND LEAD ALLOYS
other process of manufacture shall be removed.
The paper shall be free from dark spots, im- The composition of lead and lead al!oys for
perfectly pulped materials, woody matter, lime the metallic sheath of the cable shall comply
spots, metallic par:icles and other deleterious with Annex C.
 IS 692 : 1994

11 ARMOURING MATERIALS SECTION 3 CONSTRUCTION

11.1 Any one of the following armouriog 15 CONDUCTOR
materials shall be used:
15.1 The construction of the conductors shall
a) Galvanized steel tape, be as follows:
b) Ungalvanized steel tape, Nominal Cross- Solid/Stranded Flexibility Class
Sectional Area
Cl Galvanized round steel wires, r__-h____
4 Galvanized steel strip, or Copper
Alumin-
ium
e) Any non-magnetic material. mmr mm”
11.2 The armourillg material covered by 11.1 (a) 6 Upto 10 Solid/ Class I for solid
to 11.1 (d) shall comply with IS 3975 : 1988. Stranded Class 2 for
stranded of
11.3 The specification for non-magnetic armo- IS 8130 : 1984
uring material shall be as agreed between the
purchaser and the manufacturer. 10 and 16 and Stranded Class 2 of
above above IS 8130 : 1984
12 LAPPED BEDDING AND SERVING 15.2 The conductors of all twin-core, three-
MATERIALS core and multi-core cables having their nominal
12.1 The materials for lapped bedding aild cross section less than 25 mm2 shall be circular
serving shall be as follows: only.

a) Textile Materials - Cotton, hessian, jute 15.3 Cables with reduced neutral conductor
or any other synthetic material; shall comply with the main and neutral
conductor combination given below:
b) Plastic Tapes - Tapes of PVC, polyethy-
lene or any other plastic material; and Nomilral Cross-Sectional Cross-Sectional Area of
of Main Conductor Reduced Neutral’
Cl Paper - It shall be free from pin-holes Conductor
and has minimum thickness of 0.1 mm. mm3 mm2
12.2 Before application on cable, all natural 25 16
textile materials and paper shall be treated with 35 16
protective compound. 50 25
13 PROTECTIVE COMPOUND 70 35
13.1 All protective compounds used for beddin 95 50
and serving shall be derived from bitumen and 120 70
shall be free from distillation products of coal 150 70
and wood. They shall not have any deleterious
effect on the lead or lead-alloy sheath, armour 185 95
and bedding and serving materials. They shall 240 120
be of such a nature that in the finished cable 300 150
they do not crack or run at any temperature
likely to be attained in transit to the site or on 400 185
the site, befdre or after laying or whent he 500 240
cables are m operation. 630 300
13.2 The compound shall adhere properly to 16 SCREENING
the armour and the lead or lead-alloy sheath,
so that if coverings are unwrapped, it shall be 16.1 Conductor Screening
evident that the metal surfaces were completely
covered by closely adherent compound before All cables having rated voltage above 11 kV
removal of the wrapping. shall have a screen on each conductor consist-
ing of two layers of semi-conducting carbon
14 PVC COMPOUND paper tape. The two layers shall be helically in
the same direction and breaking joint.
PVC compound for extruded bedding or serving 16.2 Core Screening
or both shall comply with the requirement of
Type ST1 and ST2 of IS 5831 : 1984 as appli- Core screen shall be applied on single core
cable. cables having rated voltage of 6.3 5/ 11 kV and

3
IS 692 : 1994

above, and 3-core and 3.core SL cables of 18.3 Screened SL Cables

voltage rating 12.7122 kV and 19133 kV.
In screened SL cables, the screened cores mass-
16.2.1 For 6.35 kV and 11/l 1 kV 3-core cables, impregnated in accordance with 19 lead or lead
the screen shall be applied on cores if screened alloy sheathed in accordance with 20 and bedded
type eable is required. in accordance with 21 shall be laid up together
with interstitches filled with compounded worm-
16.2.2 The screen shall be of a layer of non- ing material and followed by one or more
ferrous metallic tape or perforated metallised layers of textile material.
paper.
18.4 Direction of Laying Up
NOTE - Application of non-ferrous metallic tape
without gap is not permissible. For all twin and multi-core cables the direction
17 CORE INSULATION of laying up shall be right-hand.

17.1 The conductor in accordance with 15.1 19 IMPREGNATION

and 15.2 shall be helically lapped with tapes of
insulating paper. When applied in the same 19.1 Insulation, paper-screens, fillers and
direction, successive layers of paper shall break binders tape ( if any ) shall be dried and im-
joint so as to form a reasonably smooth cover- pregnated with an insulating compound.
ing of uniform thickness. 19.2 When specifically agreed to between the
purchaser and the manufacturer, the cables
17.2 Core Identification impregnated with non-draining compound shall
17.2.1 All twin- and multi-core cables shall have comply with the drainage test.
the identified numbers printed on the outer NOTE - Where the cables are to be installed on
layer of core insulation at frequent intervals. verticle runs or gradients, the use of non-draining
The dyes used for printing numbers shall not compound is recommended.
fade beyond recognition, and shall be chemi-
cally neutral and free from deleterious effect on 19.3 Thickness of Insulation
paper. The thickness of insulation excluding all screen-
17.2.2 Following numbers shall be used for ing materials shall not be less than the value
specified in the relevant tables.
core identification:

a) 0*65/1*1 kV cable 20 LEAD OR LEAD ALLOY SHEATH

1) Twin-core cable 0 1 - - 20.1 After impregnation, the cable shall be

covered with a metallic lead or lead alloy sheath
2) Three-core cable o-1 2 3 - as specifically agreed to between the purchaser
3) Four-core cable 0 1 2 3 and the manufacturer.
b) Three-core cables - 1 2 3 20.2 The sheath shall be extruded directly on
of 1*9/3*3 kV and the cable in the form of a seamless tube. It shall
higher voltages be reasonably close-fitting, impervious to
moisture and free from pin-holes, joints, mended
NOTE - The numbers 1, 2 and 3 indicate the phase place and other defects. Stop-marks of the press
conductors and 0, the neutral conductor. are not considered as defects.
18 LAYING-UP OF CORES
20.3 Thickness
18.1 Belted Cables The thickness of sheath shall not fall below the
In twin and multi-core cab!es, the cores in value specified in the relevant tables.
accordance with 16 shall be laid up together
with interstitches filled with worming material 21 BEDDING
and covered with further layers of paper for 21.1 Armoured cable shall have a protective
belt insulation to form a reasonably compact bedding over lead or lead alloy sheath.
and circular cable.
21.2 Lapped Bedding
18.2 Screened Cables 21.2.1 Except in SL cables, the bedding applied
In three-core screened cables, the screened shall consist of suitably impregnated and com-
cores in accordance with 16 shall be laid up pounded papers or a combination of two layers
together with interstitches filled with worming of impregnated and compounded paper followed
material, and further lapped with a binder of by one or more layers of compounded fibrous
copper woven fabric tape. material.

4
 IS 692 : 1994

21.2.1.1 As an alternative to paper tapes, it shall consist of non-magnetic material and shall
shall be permissible to use plastic tapes. be as specifically agreed to between the purchaser
and the manufacturer. In case of single-core
21.2.1.2 The impregnation of bedding of natural cables intended for use in dc system, armouring
textile material may be made with bituminous shall be done by galvanized steel wire strip.
compound of other preservative material.
22.2 Application
21.2.2 In SL cables, the bedding shall consist
of bedding over each lead sheath followed by a 22.2.1 Double Steel Tape Armour
covering layer over the laid up lead sheathed
and lapped cores. The bedding over each lead 22.2.1.1 When steel tapes are ungalvanized, they
sheath shall consist of one of the following: shall b: thoroughly coated on both sides with
protective compound before being applied to
a>At least two layers of impregnated and the cable.
compounded paper,
22.2.1.2 The two layers of tape shall be laid
b) 2-layers of plastic tape, or helically with a left-hand lay so that outer tape
cl l-layer of impregnated paper and layer of is approximately central over the gaps of inner
impregnated textile material, both being tape. The gap between the adjacent turns of
compounded. each tape shall not exceed 50 percent of the
tape width. The outer tape shall overlap the
21.2.2.1 The covering over the laid up cores inner tape on both sides by not less than 15 per-
shall consist of one or more layers of impregnat- cent of the tape width.
ed and compounded natural textile material.
22.2.1.3 The nominal thickness of uncompound-
21.2.2.2 The impregnation of bedding of natural ed steel tape shall be as specified in the relevant
textile material may be made with bituminous tables.
compound or other preservative material.
22.2.2 Single Wire or Strip Armour
21.2.3 Thicliness of Bedding
The armour shall consist of a single layer of
The total thickness of the protection between galvanized steel wire or strip and shall be applied
lead sheath and armour measured after appli- with left-hand lay. The nominal diameter of
cation of the arrnouring should have the wire or dimensions of strip shall be as specified
approximate value of 1.5 mm. in the relevant table.
21.3 Extruded Bedding 22.2.3 Double Wire or Strip Armour
21.3.1 When an extruded PVC bedding is applied 22.2.3.1 The armour shall consist of two layers
over a lead sheath, it shall be preferably black of galvanized steel wires or strips. The inner
and of type ST2 of IS 5831 : 1984. layer of wires or strips shall be applied with
left-hand lay. The outer layer shall be applied
21.3.2 Thickness with right-hand lay except in special cases when
The thickness of extruded bedding shall not specifically agreed to between the purchaser and
the manufacturer.
fall below the value specified in the relevant
tables. 22.2.3.2 Separator
22 ARMOUR A separator consisting of a layer of compounded
textile material shall be applied between the-
22.1 Type of Armour two layers of armour wires or strips.
For cables having calculated diameter over lead 22.2.3.3 For both layers, the nominal diameter
or lead-alloy sheath up to and including 13 mm, of wires or dimensions of strips shall be the
the armour shall consist of galvanized round same as for single wire or strip armoured
steel wires only. Where calculated diameter cable.
over lead or lead alloy sheath is more than
13 mm, the armour shall consist of galvanized 22.3 Binder Tape
round steel wires or galvanized steel strips or
A binder tape may be applied over flat steel,
two layers of galvanized or ungalvanized steel
wire armour, or if necessary, over round steel
tape.
wire armour. It may be applied in the same
22.1.1 In case of SL cables, the basis of selec- direction as the armour or in the opposite
tion of the type of armour shall apply to the direction.
calculated diameter over laid up cores.
22.3.1 It shall consist of galvanized steel tape,
22.1.2 Where armouring is required for single- having a nominal thickness of not less than
core cables intended for use in ac system, it O-2 mm. The minimum thickness shall not

5
IS 692 : 1994

fall below the specified nominal value by more b) Tensile test IS 8130 : Part 2 of
than 10 percent. ( for aluminium ) 1994 IS 10810
22.4 Joints cl Wrapping test do Part 3 of
( for aluminium ) IS 10810
The joints in the armour/strips or tapes shall
be made by brazing or welding and the surface d) Conductor resis- do Part 5 of
irregularities shall be removed. A joint in any tance test IS 10810
wire/strip or tape shall be at least 300 mm from 19.3 of 24.5 of
the nearest joint in any other armour wire/strip e) Test for thickness
of insulation IS 692 IS 692
or tape in the completed cable.
23 SERVING AND OVERALL SHEATH
f ) Test for thickness 20.3 of Part 34 of
of lead and lead IS 692 IS 10810
23.1 Textile Serving on Armour alloy sheath
The serving having an approximate thickness 8) Breaking strength 24.6 of Part 8 of
of 2 mm shall consist of a suitable number of and elongation IS 692 IS 10810
compounded layers of textile material. In order test for insula-
to prevent adhesion, a coating of white wash or tion
suitable material shall be applied to the outside
of the cable. ‘9 Test for thick- IS 3975 : Part 36 of
ness of steel 1988 IS 10810
NOTE - The impregnation of textile serving may be tape or diameter
made with either bituminous compounds or other or round steel
preservative materials.
wire or dimen-
23.2 Extruded Outer Sheath for Unarmoured or sions of flat
Armoured Cables steel strips
This shall be black preferably and of type ST2 j) Test for thick- 21.3.2 and Part 6 of
of IS 5831 : 1984. ness of extruded 23.3 of IS 10810
PVC bedding IS 692
23.2.1 Thickness
and serving
Where the sheath is applied over the lead sheath
of an unarmoured cable, the average thickness k) Tests for physical
determined by taking a number of measurements properties
shall not be less than the value specified in the extruded P\Z
relevant tables and the smallest of the measur- bedding and
ed values shall not fall below the specified serving:
value + 0.2 mm. For this purpose, the calculat- 1) Tensile IS 5831 : Part 7 of
ed minimum permissible value shall be rounded strength and 1984 IS 10810
off to an accuracy of 0.01 mm. elongation at
23.2.1.1 When the sheath is applied over break
armoured cables, the thickness shall not fall 2) Loss of mass Part 10 of
below the value specified in the relevant tables. in air oven IS 10810
23.3 The thickness of extruded PVC serving 3) Shrinkage Part 12 of
shall not fall below the value specified in the test IS 10810
relevant table. 4) Hot defor- Part 15 of
mation test IS 10810
NOTE - For embossed cables, the point at which
the measurements made shall not coincide with any
embossing. ml Impulse test 24.7 of Part 47 of
IS 692 IS 10810
SECTION 4 TESTS
n) Dielectric power 24.8 of Part 48 of
24 CLASSIFICATION OF TESTS factor/voltage IS 692 IS 10810
test ( for
24.1 Type Tests 19133 kV cables
The following shall constitute type tests: only )
For Require- For Test p) High voltage 24.9 of Part 45 of
ments Refer Methodr test IS 692 IS 10810
to: Refer to: q) Bending test 24.13 of Part 50 of
a) Annealing test IS 8130 : Part 1 of for finished IS 692 IS 10810
( for copper ) 1984 IS 10810 cables

6
 Is 692 : 1994

24.2 Acceptance Tests characteristics as described in IS 10810

( Part 6 ) : 1984. All the tapes which make up
The following shall constitute acceptance tests: the insulation shall be included in the measure-
4 Conductor resistance test, ment. When thickness of the insulation is so
great that it is inconvenient to bunch all the
b) Test for thickness of insulation, tapes, they may be separated into as few groups
as are necessary to obtain satisfactory measure-
4 Test for thickness of lead and lead alloy ment of each group. The thickness of all the
sheath,
groups shall be added to obtain the total thick-
(-9Test for thickness of steel tape or dia- ness. The faces of the micrometer shall be
meter of round wires or dimensions of cleaned between successive measurements.
steel strips,
24.6 Breaking Strength and Elongation Test for
e) Dielectric power factor/voltage test Insulation
( for 19/33 kV cables only ),
This test shall be in accordance with IS 10810
f> Voltage test, and ( Part 8 ) : 1964 and when tested thus the
8) Test for thickness of extruded PVC bed- breaking strength of the test strip shall not fall
ding and serving. below 700 N mm of thickness and the elonga-
tion at break shall not be less than I.5 percent.
24.2.1 A recommended sampling plan for
acceptance tests is given in Annex D. 24.7 Impulse Test
24.3 Routine Tests 24.7.1 An impulse test as laid down in 24.7.2
may be applied as a type test for 12.7/22 kV
The following shall constitute routine tests: cables and 19/33 kV cables. For 6*35/11 kV
a) Conductor resistance test, cables, this test is not required. It shall be
b) Dielectric power factor/voltage test considered sufficient if the impulse level of
( for 19/33 kV cables only ), and 75 kV is certified by the manufacturer.
c) Voltage test. 24.7.2 For orders for cables of length of 5 km
24.4 Optional Tests and above, a sample of 10 m length taken from
every 6 km of the cable shall be subjected to
The following shall constitute optional tests: impulse voltage test which shall be carried out
For Require- For Test at room temperature in accordance with
ments Refer Method IS 10810 ( Part 47 ) : 1984 and no break-down
to: Refer to: of the insulation shall occur. The impulse test
voltages shall be as follows:
a) Drainage test 24.10 of Part 52 of
for cables IS 692 IS 10810 Voltage Designation U,/U Impulse Test
installed ver- Voltage
tically,
kV kV
b) Flammability 24.11 of Part 53 of
test, and IS 692 IS 10810 12.7122 125
c) Dripping test 24.12 of Part 51 of 19133 170
IS 692 IS 10810
24.8 Dielectric Power Factor/Voltage Test
24 5 Test for Thickness of Insulation
24.8.1 This test is applicable only to 19/33 kV
24.5.1 The measurement of the thickness of the cables and shall be carried out before the high
insulation shall be made on a representative voltage test at room temperature in accordance
sample of the cable not more than 150 mm in
with IS 10810 ( Part 48 ) : 1984.
length, taken not less than 300 mm from the
end of a factory length. 24.8.2 The test shall be made at 0.5 E,, E,
24.5.2 Procedure and 2 E, ( that is, 9.5 kV, 19 kV and 38 kV )
between each conductor and screen or metallic
The thickness of insulation shall be determined sheath.
by bunching together the individual paper tapes
removed from the finished cable ( without 24.8.3 The value of power factor of dielectric
removing the surplus compound from the loss at rated E,, ( that is, at 19 kV ) and the
papers ) and measuring the total thickness with difference in power factor between the half and
dead weight dial type micrometer having the rated voltage 9.5 kV and twice the rated voltage

7
IS 692 : 1994

( 38 kV ) shall in no case exceed the appro- 24.9.3 Alternatively by agreement between the
priate value specified below: purchaser and the manufacturer, the test may
Type of insulation Maximum Power Maximum
be made with direct current, the applied volt-
age being 2.4 times the power frequency test
Factor at Rated Difjkrence
voltage and duration of the test 5 minutes.
Voltage in Power
( 19 kV ) Factor Be- 24.10 Drainage Test for Cables Installed
tween Half Vertically
Rated Volt-
age 9.5 kV This test shall be carried out in accordance
and Twice with IS 10810 ( Part 52 ) : 1984. The maximum
Rated drainage shall not exceed 3 percent. The test
Voltage sample shall be suspended vertically at the
(38kV) appropriate temperatures given below:
For cables with 0*008 o-002 4
normal compound Voltage Designation Type Test
kV Temperature
For cables with O*Ol 0.012 “C
non-draining type
compound Up to and includ- All types 80
ing 6~616.6
24.9 High Voltage Test 6*35/11 and ll/ll Screened 70
single-core
24.9.1 All completed cables shall be subjected and 3-core
to the voltage test which shall be carried out in
accordance with IS 10810 ( Part 45 ) : 1984 and 6*35/11 and ll/ll Belted 3-core 65
no break-down of the insulation shall occur. 12.7122 All types 65
24.9.2 The test shall be at room temperature 19133 All types 65
and the value of the applied ac test voltages
shall be as given below. The voltage shall be 24.11 Flammability Test ( Applicable to
applied and increased gradually to the specified Extruded PVC Served Cables Only )
value and shall be maintained continuously This test shall be carried out in accordance
for 5 minutes between conductors and between with IS 10810 ( Part 53 ) : 1984. Period of
each conductor and sheath which shall be burning -after removal of flame shall not
earthed. exceed 60 seconds and the unaffected ( un-
charred ) portion from the lower edge of the
Test Voltage on Completed Cable at Works top clamp shall be at least 50 mm.
Alternating Test Voltage ( rms ) 24.12 Dripping Test
r------- --h__-_--~
Belted Cables Single-core SL This test shall be carried out in accordance
r--- A---- 7 and Screened with IS 10810 ( Part 51 ) : 1984 and shall meet
Between Between Cables the following requirements:
Condu- Condu- r---h--l
ctors ctors and Between 4 Where the same type of compound is
sheath any con- used for bedding and serving, the com-
ductor and pound shall not drip from any point,
sheath and
b) Where separate grades of compounds
(1) (2) (3) (4) are used for bedding and serving the
kV kV kV kV compound for the serving shall not drip
from any point.
3 3
24.13 Bending Test for Finished Cables
l-9/3*3 9.5 5.5 5.5
This test shall be carried out in accordance
3.313.3 9.5 9.5 9.5 with IS 10810 ( Part 50 ) : 1984 and shall meet
3*8/6*6 17 9.8 9.8 the following requirements:
6-616.6 17 17 17 a) The cable sample withstands the applied
6*35/11 25 14.4 25 voltage test without failure; and
ll/ll 25 25 17 b) The visual examination shows that the
serving is free from splits; the armour is
12.7122 - - 30 not noticeable disposed and the sheath
19133 - - 45 is free from splits or cracks.
 IS 692 : 1994

SECTION 5 IDENTIFICATION, PACKING Single round steel wire armour W

AND MARKING Single steel strip armour F
25 END MARKING Double round steel wire armour ww
Double steel strip armour FF
The ends of factory lengths of cables shall be
capped and sealed with plumbing metal, the 29 PACKING AND MARKING
cores being suitably insulated from the cap. 29.1 The cable shall be wound on a drum of
The caps shall be marked with letters ‘A’ suitable size ( see IS 10418 : 1982 ) packed and
and ‘Z’, ‘A’ being the end at which the sequence marked.
of the core numbers ( see 16.2 ) is clockwise
and ‘Z’ the end at which the sequence is anti- 29.1.1 The cable shall carry the following
clockwise. information stencilled on the drum:
26 VOLTAGE IDENTIFICATION a) Indication of source of manufacture,
b) Type of cable and voltage grade,
26.1 All 3.3 kV cables and above with lapped
serving shall be identified by means of galvanis- c) Cable code,
ed steel wire of diameter l-4 mm or alternatively d) Nominal cross-sectional area of the
a galvanised steel strip of size O-4 x O-8 mm conductor,
applied longitudinally as follows: e) Number of cores,
a) Unarmoured cables : Over the outer f) Length of the cable on the drum,
layer of paper in g) Number of lengths on drum ( if more
bedding than one ),
b) Armoured cables : Over the armour- h) Direction of rotation of drum ( by means
ing. of an arrow ),
26.2 Where the cable is provided with extruded j) Approximate gross mass; and
PVC serving this shall be embossed legibly with k) Year of manufacture.
the words ‘HIGH VOLTAGE’.
27 MANUFACTURERS IDENTIFICATION SECTION 6 TABLES
The manufacturer’s name or trade mark shall Table 1 Dimensions for O-66/1*1 kV
be identified throughout the length of the cable ( Earthed or Unearthed ) Single-core
by a tape under the sheath, bearing the manu- ( Unarmoured ) Cables
facturer’s name or trade mark and the year of
Nominal Thickness Thickoess
manufacture. As an alternative, for cables with
an outer sheath of PVC, the identification of
LTOSS
Section
of
Insulation
of
Lead or
Tbic::ess
Extruded
the manufacturer and the year of manufacture Le;ad;Al$ y PVC
may be by printing, indentation or embossing on Serving
the outersheath. (1) (2) (3) (4)
mm2 mm mm mm
28 CABLE IDENTIFICATION CODE 6 1’4 1-o 1’4
10 1’4 10 1’4
The following code is recommended for distin- 16 1’4 1’0 1’4
guishing the type of cable required:
25 1’4 1’0 1’4
Constituent Cable Letter 35 1’4 1’0 1’4
50 1’4 1’0 1’4
Aluminium conductor A
70 1’4 1’0 1‘4
Paper insulation P 95 1’4 1’0 1’4
Lead sheath L 120 1’4 1’1 1’4
1.50 1’4 1’1 1’4
Lead alloy sheath LY 185 1’4 1’2 1’4
Lapped bedding or serving of S 240 1’7 1’3 1’4
compounded fibrous material 300 1’7 1’4 1’4
400 2’0 1’5 1’4
Extruded PVC bedding or serving Y
500 2’0 1’6 1’5
Double steel tape armour T 630 2’3 1’7 1’6
800 2‘5 1’8 1’7
Double steel tape armour galva- Tg
ni7d I 000 2’5 2’0 1’8
_-.__-

9
IS 692 : 1994

Table 2 Dimensions for 1*9/3-3 ( Earthed ) Table 4 Dimensions for 3*8/6*6 kV

Single-Core ( Unarmoured ) Cables ( Earthed ) Single-Core
( Unarmoured ) Cables

No mitral Thickness Thickness Thickness Thickness Thickness Thickness

Cross of of Lead or of Extruded cross of of Lead or of Extruded
Section Insulation Leadrdtioy PVC Serving Section Insulation Lea$$y PVC Serving

(1) (2) (3) (4) (1) (2) (3) (4)

mm2 mm mm mm mma mm mm mm
16 2’3 1’0 1’4 16 3’0 1’0 1’4
2.5 2’3 1’0 1’4 25 3’0 1’0 1’4
35 2’3 1’0 1’4 35 3’0 1’0 1’4
50 2’3 1’0 1’4 50 3’0 I’0 1’4
70 2’3 1’0 1’4 70 3’0 1’1 1’4
95 2’3 1’1 1’4 95 3’0 1’1 1’4
120 2’3 1’1 1’4 120 3‘0 1’2 1’4
150 2’3 1’2 1’4 150 3’0 1’2 1’4
185 2’3 1’2 1’4 185 3’0 1’3 1’4
240 2’3 1’3 1’4 240 3’0 1’4 1’4
300 2’3 1’4 1’4 300 3’0 1’4 1’4
400 2’3 1’5 1’4 400 3’0 1’6 1’5
500 2’3 1’6 1’5 500 3’0 1’6 1’6
630 2’5 1’7 1’6 630 3’0 1’7 1’7
800 2’7 1’8 1’7
800 3’0 1’9 1’8
1 000 2’7 2’0 1’8
1 000 3’0 2’0 1’9

Table 3 Dimensions for 3-313-3 kV Table 5 Dimensions for 6+6/6*6 kV

( Unearthed ) SingleXore ( Unearthed ) Single-Core
( Unarmoured ) Cables ( Unarmoured ) Cables

Nominal Thickness Thickness Thickness Nominal Thickness Thickness Thickness

Cross of of Lead or of Extruded Cross of of Lead or of Extruded
Section Insulation Le;tet:oy PVC Serving Section Insulation Lea;a;;;oy PVC Serving

(1) (2) (3) (4) (1) (2) (3) (4)

mm2 mm mm mm mm2 mm mm mm
16 2’8 1’0 1’4 16 3’8 1’0 1’4
25 2’8 1’0 1’4 25 3.8 1’0 1’4
35 2’8 1’0 1’4 35 3’8 1’0 1’4
50 2’8 1‘0 1’4 50 3’8 1’1 1’4
70 2’8 1’1 1’4 70 38 1’1 1’4
95 2’8 1’1 1’4 95 3’8 1’2 1’4
120 2’8 1’2 1’4 120 3-a 1’2 1’4
150 2’8 1’2 1’4 150 3’8 1’3 1’4
185 2’8 1’3 1’4 185 3’8 1’3 1’4
240 2’8 1’4 1’4 240 3’8 1’4 1’4
300 2’8 1’4 1’4 300 3’8 1’5 1’4
400 2’8 1.6 1’5 400 3’8 1’6 1’5
500 2’8 1’6 1’5 500 3’8 1’7 1’6
630 2’8 1’6 1’6 630 3’8 1’7 1’7
800 2’8 1’8 1’7 800 3’8 1’9 1’8
1 000 2’8 2’0 1’9 1000 3’8 2’0 1’9

10
 IS 692 : 1994

Table 6 Dimensions for 6.35/11 kV Table 8 Dimensions for 12*7/22 kV

( Earthed ) Single-Core ( Earthed ) Single-Core
( Unarmoured ) Screening Cable ( Unarmoured ) Screening Cable

Nominal Thickness Thickness Thickness Nominal Thickness Thickness Thickness

cross of of Lead or of Extruded Cross of of Lead or of Extruded
Section Insulation Le;i;;ioy PVC Serving Section Insulation L;hlpgoY PVC Serving

(1) (2) (3) (4) (11 (2) (3) (4)

mm1 mm mm mms mm mm mm
16 3”: 1.0 1’4 25 5’8 1’1 1’4
25 3’3 1’0 1’4 35 5’8 1’2 1’4
35 3’3 1’0 1’4 50 5’8 1’2 1’4
50 3’3 1’1 1’4 70 5’8 1’3 1’4
70 3’3 1‘1 1’4 95 5’8 1’3 14
95 3’3 1’2 1’4 120 5’8 1’4 1’4
120 3’3 1’2 1’4 150 5’8 1’4 1’4
150 3’3 1 ‘3 1’4 IS5 5’8 1’5 1’4
185 3’3 1’3 1’4 240 5’8 1’6 1’5
240 3’3 1’4 1’4 300 5’8 1’6 1’6
300 3’3 1‘5 1’4 400 5’8 1’7 1’6
400 3’3 1‘6 1’5 500 5’8 1’8 1’7
500 3’3 1‘7 1’6 630 5’8 1’9 1’8
800 5’8 2’0 1’9
630 3’3 1’8 1‘7
1 000 5’8 2’2 2’0
800 3’3 1’9 I ‘8
1 000 3’3 2’0 1’9
NOTE - These cables may also be used for 6’616’6
kV system.

Table 7 Dimensions for ll/ll kV

( Earthed ) Single-Core
( Unarmoured ) Screening Cable
Table 9 Dimensions for 19/33 kV
Nominal Thickness ( Earthed ) Single-Core
Thickness Thickness
Cross of of Lead or of Extruded ( Unarmoured ) Screening Cable
Section Insulation Lead-Alloy PVC Serving
Sheath
_~~.__~
Nominal Thickness Thickness Tkickness
(1) (2) (31 (41 Cross of of Lead or of Extruded
mm2 mm mm mm Section Insulation L e;i;t:oy PVC Serving
25 4’6 1’1 1’4
35 4’6 1’1 1’4 (1) (2) (3) (4)
50 4’6 1’1 1’4 mm~ mm mm mm
70 4’6 1’2 1’4 70 8’0 1’4 1’4
95 4’6 1’3 1‘4 95 7.6 1’4 1’4
120 4’6 1’4 1’4 120 7’6 1’5 1’5
150 4’6 1’3 1’4 150 7’1 1’5 1’5
185 4’6 1’4 1’4 185 7’1 1’5 1.5
240 4‘6 1’5 1’4 240 7’1 1’6 1’6
300 4’6 1’6 1’5 300 7’1 1’7 1‘6
400 4’6 1’7 1’6 400 7’1 1’8 1’7
500 4’6 1’8 1’7 500 7’1 1’9 1’8
630 4’6 1’9 1’7 630 7:1 2’0 1’9
800 4’6 2’0 1’9 800 7’1 2‘1 2’0
1 000 4’6 2’1 2’0 1 000 7’1 2’3 2’1

11
 Table 10 Dimensions for O-65/1*1 kV ( Earthed or Unearthed ) Two-Core Belted Cables

Nominal Thickness of Thickness of Lead Thickness or Extru- Nominal Dimensions of Extruded PVC
cross Insulatibn or Lead Alloy ded Bedding for Armour Serving
Section ,___---h-_-__T Sheath Armoured Cables c--------- *-._----- -- -7 ~_~_~~h~~_~~
Hetween Between Steel Round Steel Strip Thickness Thickness
Conductors Conductor Tave Steel Wire Thickness for for
and Sheath Thickness Diameter r---h---y Un;;m;red A;rmgr;d
Type
(a) T&T
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
mm3 mm mm mm mm mm mm mm mm mm mm
6 1’8 1’4 1’0 0’8 - 1’40 - 1’4 1’1
10 I.8 1’4 1’0 0’8 1’60 - - 1’4 1’1
16 1’8 1’4 1’0 0’8 0’5 1’60 0’8 - 1’4 1’1
w. 25 1’8 1’4 1’0 0’8 0’5 1’60 0’8 - 1’4 1’2
h)
35 1’8 1’4 1’0 0’8 0’5 1’60 0’8 - 1’4 1’2
50 1’8 1’4 1’1 0’8 0’5 1’60 0’8 - 1’4 1’3
70 1’8 1’4 1’1 0’8 0’5 2’0 0’8 - 1’4 1’4
95 1’8 1’4 1’2 0’9 0’5 2’0 0’8 - 1’4 1’4
120 1’8 1’4 1’3 1’0 0’5 2’0 0’8 - 1’5 1’5
150 1’8 1’4 1.3 1’0 0’5 2’0 0’8 - 1’6 1’6
185 1’8 1’4 1’4 1’1 0’5 2’0 0’8 - 1’7 1’6
240 2’0 1’7 1’6 1’2 0.8 2’50 0’8 1’4 1’8 1’8
300 2’0 1’7 1’7 1’2 0’8 2’50 0’8 1’4 1’9 1’9
400 2’3 2’0 1’9 1’4 0’8 3’15 0’8 1’4 2’1 2’1
500 2’3 2’0 1’9 1’4 0’8 3’15 0’8 1’4 2’3 2’2
630 2’5 2’3 2’1 1’6 0’8 3’15 0’8 I’4 2’5 2’3
 Table 11 Dimensions for O-65/1-1 kV ( Earthed or Unearthed ) Three-Core Belted Cables

Nominal Thickness of Thickness of Lead Thickness of Exten- Nominal Dimension of Extruded PVC
cross Insulation or Lead-Alloy ded Bedding for Armour Serving
Section r--__-*--___T Sheath Armoured Cables c--------- *-_-_--_-_--~ ~~~~_~-__~--~
Between Between Steel Round Steel Strips Thickness Thickness
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter r_-_h-_-~ Unarmoured Armoured
Type Type Cables Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
mm” mm mm mm mm mm mm mm mm mm mm
6 1’8 1’4 1’0 0’8 - 1’40 - - 1’4 1’1
10 1’8 I ‘4 1’0 0’8 - 1’60 - 1’4 1’1
16 1’8 1’4 1’0 0’8 0’5 1’60 0’8 z 1’4 1’2
25 1’8 1’4 I ‘1 0’8 0’5 1’60 0’8 1’4 1’2
35 1’8 1’4 1’1 0’8 0’5 1’60 0’8 z 1’4 1’3
50 1’8 1’4 1’2 0.8 0’5 1’60 0‘8 1’4 1’3
w’ 70 1’8 1’4 1’3 0’9 0’5 2’00 0’8 z 1’4 1’4
95 1’8 1’4 1’4 0’9 0’5 2’00 0’8 - 1’5 1’5
120 1’8 1’4 1’4 1’0 0’5 2’00 0’8 - 1’6 1’6
150 1’8 1’4 1’5 1’1 0’5 2’00 0’8 1’7 1’6
185 1’8 1’4 1’6 1’1 0’8 2’50 0’8 1.4 1’8 1’7
240 2’0 I ‘7 1’8 1’2 0’8 2’50 0‘8 1’4 1’9 1’9
300 2’0 1’7 1’9 1’3 0’8 2’50 0’8 1’4 2’0 2’0
400 2’3 2’0 2’1 1’4 O’S 3’15 0.8 1’4 2’3 2’2
500 2’3 2’0 2’2 1’5 0’8 3’15 0’8 1.4 2’4 2.3
630 2’5 2’3 2’4 1’7 0’8 4’0 0’8 1’4 2’7 2’5
 E
c
Table 12 Dimensions for O-65/1*1 kV ( Earthed or Unearthed ) Three-and-a-half Core Cables N
..
G
Nominal Cross Thickness of Thickness of Thickness of Nominal Dimensions of Extruded PVC g
Section Insulation Lead or Lead- Extruded Bcd- Armour Serving
r-___h_--7 (____.-__h---__7 Allov Sheath ding for r----------h-_--_--_-__ . -------h-----7
Main Neutral Between Between Armoured Cables Steel Round Steel Strip Thickness Thickness
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter #---_*_--7 Unarmoured Armoured
Type Type Cables Cables
(a) 03
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)
mm’ mm mm mm mm mm mm mm mm mm mm mm
25 16 1’8 1’4 1’1 0’8 0’5 1’6 0’8 - 1’4 1’2
35 16 1’8 1’4 1’2 0’8 0’5 1’6 0’8 - 1’4 1’3
50 25 1’8 1’4 1’3 0’8 0’5 2’0 0’8 - 1’4 1’4
70 35 1’8 1’4 1’3 0’9 0’5 2’0 0’8 - 1’4 1’4
95 50 1’8 1’4 1’4 1’0 0’5 2’0 0’8 - 1’5 1’5
120 70 1’8 1’4 1’5 1’0 05 2’0 0’8 - 1’6 1’6
150 70 1’8 1’4 1’6 1’1 0’5 2’0 0’8 - 1’7 1’7
185 95 1’8 1’4 1’7 1’1 0’8 2’5 0’8 1’4 1’8 1’8
z
240 120 2’0 1’7 1’9 1’2 0’8 2’5 0’8 1’4 2’0 1’9
300 150 2’0 1’7 1’9 1‘3 0’8 2’5 0’8 1’4 2’1 2’0
400 185 2’3 2’0 2’2 1’5 0’8 3’15 0’8 1’4 2.3 2’2
500 240 2’3 2’0 2.6 1’6 0’8 3’15 0’8 1’4 2’5 2’3
630 300 2’5 2’3 2’5 1’7 0’8 4’0 0’8 1’4 2’7 2’5
 Table 13 Dimensions for O-65/1-1 kV ( Earthed or Unearthed ) Four-Core Belted Cables

Nominal Thickness of Thickness of Lead Thickness of Extru- Nominal Dimensions of Extruded PVC
Cr0.W Insulation or Lead-Alloy ded Bedding for Armour Serving
Sertion r------ h-------, Sheatb Armoured Cables r- ------ --- *_----__-_-7
Between Between St.zel Xoufid Steel Strip Thickness Thickness ’
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter r---~---7 Unarmoured Armourcd
Type Type Cables Cables
(a) (b)
(Ii (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
mm’ mm mm mm mm mm mm mm mm mm mm
6 1’8 1’4 1’0 0’8 - 1’6 - 1’4 1‘1
10 1.8 1’4 1’0 0’8 0’5 1’6 0’8 1 1’4 1’2
16 1’8 1’4 1’1 0’8 0’5 1.6 0’8 - 1‘4 1’2
25 1’8 1’4 1’1 0’8 0’5 1’6 0’8 - 1’4 1’3
35 1’8 1’4 1’2 0’8 0’5 I’6 0’8 - 1‘4 1’3
50 1’8 1’4 1’3 0’9 0’5 2’0 0’8 - 1’4 1’4
70 1’8 1’4 1’4 0’9 0’5 2’0 0’8 - 1’5 1’5
95 1’8 1’4 1’5 1’0 0’5 2’0 0’8 - 1’6 16
120 1’8 1’4 1’6 1’1 0‘5 2’0 0’8 - 1’7 1’7
150 1’S 1’4 1’6 1’1 0’8 2’5 0’8 1’4 1’8 1’8
185 1’8 1’4 1’8 1’2 0’8 2’5 0’8 1’4 1’9 1’8
240 2’0 1’7 2’0 1’3 0’8 2’5 0’8 1’4 2’1 2’0
300 2’0 1’7 2’1 1’4 0’8 3’15 0’8 1’4 2’2 2’1
400 2’3 2’0 2’4 1’5 0’8 3’15 0’8 1’4 2’5 2’3
500 2’3 2’0 2’4 1’7 0’8 4’0 0’8 1’4 2’6 2.5
630 2’5 2’3 2’7 1’8 0’8 4’0 08 1’4 2’9 2’7
 ti

Table 14 Dimensions for 1*9/3-3 kV ( Earthed ) Three-Core Belted Cables E

..
-
Nominal Thickness of Thickness of Lead Extruded PVC z
Thickness of Extru- Nominal Dimensions of p.
Cross Insulation or Lead Alloy ded Bedding for Armour Serving
Section c- ___- *___--7 Sheath Armoured Cables *_-__-_--- -7 r__-_-*------7
r---------
Between Between Steel Round Steel Strip Thickness Thickness
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter ~----h_--_7 Unarmoured Armoured
Type Cables Cables
(a) T$;e
(1) (2) (3) (4) (5) (6) (7) (8) (9) (IO) (11)
mm* mm mm mm mm mm mm mm mm mm mm
16 2’8 2’3 1’1 0’8 0’5 1’6 0’4 - 1’4 1’2
25 2’8 2’3 1’1 0’8 0’5 1’6 0’8 1’4 1’3
35 2’8 2’3 1’1 0’8 0’5 1‘6 0’8 1 1’4 1’3
50 2’8 2’3 1’3 0’9 05 2’0 0’8 1’4 1’4
70 2’8 2’3 1’4 0‘9 0’5 2’0 0’8 1’5 1’5
95 2’8 2’3 1’5 1’0 0’5 2’0 0’8 1 1’6 1’6
120 2’8 2’3 1’5 1’0 0’5 2’0 0’8 - 1’7 1’6
z
I50 2’8 2’3 1’6 1’1 0’8 2’5 0’8 1’4 1’7 1’7
185 2’8 2’3 1’7 1’2 0’8 2’5 0’8 1’4 1’8 1’8
240 2’8 2’3 1’9 1’2 0’8 2’5 0’8 1’4 2’0 1’9
300 2’S 2’3 2’0 1’3 0’8 2’5 0’8 1’4 2’1 2’0
400 2’8 2’3 2’2 1’4 0’8 3’15 0’8 1’4 2’3 2’2
500 2’8 2’3 2’3 1’5 0’8 3’15 0’8 1’4 2’5 2’3
630 2’8 2’3 2’5 1’7 0’8 4’0 0’8 1’4 2’7 2’5
 Table 15 Dimensions for 3*3/3-3 kV ( Unearthed ) Three-Core Belted Cables

Nominal I Thickness of Thickness of Lead Thickness of Extru- Nominal Dimensions of Extruded PVC
cross Insulation or Lead-Alloy ded Bedding for Armour Serving
Section p_-__-*---__~ Sheath Armoured Cables r- --------- h--_-_-__,_ .,------h-~~_-__
Between Between Steel Round Steel Strip ’ Thickness Thickness ’
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter C- ---*-----, Unarmoured Armoured
Tape Tape Cables Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) 63) (9) (10) (11)
mme mm mm mm mm mm mm mm mm mm mm
16 2’8 2’8 1’1 0’8 0’5 1’6 0’8 - 1’4 1’3
25 2’8 2’8 1’1 0’8 0’5 1’6 0’8 - 1’4 1’3
$ 35 2’8 2’8 1’2 0’8 0’5 2’0 0’8 - 1’4 1’4
50 2-8 2’8 1’3 0’9 0’5 2’0 0’8 - 1’4 1’4
70 2’8 2’8 1’4 1’0 0’5 2’0 0’8 - 1’5 1’5
95 2’8 2’8 1’5 1’0 Q’5 2’0 0’8 - 1.6 1’6
120 2’8 2’8 1’5 1’1 0’5 2’0 0’8 - 1’7 1’7
150 2’8 2’8 1’6 1’1 0’8 2’5 0’8 1’4 1’8 1’8
185 2’8 2’8 1’7 1’2 0’8 2’5 0’8 1’4 1’9 1’8
240 2’8 2’8 1’8 1’3 0’8 2’5 0’8 1’4 2’0 1’9
300 2’8 2’8 2’0 1‘3 0’8 2’5 0’8 1’4 2’1 2’0
400 2’8 2’8 2’2 1’5 0’8 3’15 0’8 1’4 2’3 2’2
500 2’8 2’8 2’3 1’6 0’8 3’15 0’8 1’4 2’5 2’3
630 2’8 2’8 2’5 1’7 0’8 4’0 0’8 1’4 2’7 2’5
 E
Table 16 Dimensions for 3*8/6*6 kV ( Earthed ) Three-Core Belted Cables 2
..

Thickness of Thickness of Lead Thickness of Extru- Nominal Dimensions of Extruded PVC 5

p.
“~~:~~’ Insolation or Lead Alloy ded Bedding for Armour Serving
Section r--_---A_-___~ Sheath Armoured Cables r--------- h-_-----_-_-_ __~ r_-___h _-_ --7
Between Between Steel Round Steel Strip Thickness Thickness
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter C---h---T Unarmoured Armoured
Type Cables Cables
(a) Tf%?e
(1) (2) (3) (41 (5) (6) (7) (81 (9) (101 (111
mm2 mm mm mm mm mm mm mm mm mm mm
16 3’8 3’0 1’2 0’8 0’5 1’6 0’8 - 1’4 1’3
25 3’8 3’0 1’2 0’8 0.5 1’6 0’8 - 1’4 1’3
35 3’8 3’0 1’3 0’9 0’5 2’0 0’8 - 1’4 1’4
50 3’8 3’0 1’3 0’9 0’5 2’0 0’8 - 1’4 1‘5
70 3’8 3’0 1’5 1’0 0’5 2’0 0’8 - 1’5 1’5
95 3’8 3’0 1’5 1’0 0’5 2’0 0’8 - 1’6 1’6
120 3’8 3’0 1’6 1’1 0’8 2’5 0’8 1’4 1’7 1’7
z 150 3’8 1’8
3’0 1’7 1’1 0’8 2’5 0’8 1’4 1’8
185 3’8 3’0 1’8 1’2 0’8 2’5 0’8 1’4 1’9 1’9
240 3’8 3’0 2’0 1’3 0’8 2’5 0’8 1’4 2’1 2’0
300 3’8 3’0 2’0 1’4 0’8 3’15 0’8 1’4 2’2 2’1
400 3’8 3’0 2’2 1’5 0’8 3’1.5 0’8 1’4 2’4 2’2
500 3’8 3’0 2’4 1’6 0’8 3’15 0’8 1’4 2’5 2’4
630 3’8 3’0 2’5 1’7 0’8 4’0 0’8 1’4 2’7 2’5
 Table 17 Dimensions for 6*6/6*6 kV ( Unearthed ) Three-Core Belted Cables

Thickness of Thickness of Lead Thickness of Extru- Nominal Dimension of Extruded PVC

Nc4”02’
Section r__--_h___
Insulation
-- ~
or Lead-Alloy
Sheath
dcd Bedding for
Armourcd Cables
Armour
T------_-_h-___-__-___7 c---
Serving
___n__,-_-~
Between Between Steel Round Steel Strips Thickness Thickness
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter t--_*_--T Unarmoured Armoured
Type Type Cables Cables

(1)
mm2
(3)
mm
(4)
mm
(5)
mm
(6)
mm
(7) $1
mm
((gb; (IO)
mm mm
16 3’8 3’8 1’3 0’8 0’5 1’6 0’8 - 1’4 1’3
25 3’8 3’8 1’3 0’9 0’5 2‘0 0’8 - 1’4 1’4
35 3’8 3’8 1’3 0’9 0’5 2’0 0’8 - 1’4 1’4
3’8 3’8 1’4 1’0 0’5 2’0 0’8 - 1’5
3’8 1’5 1’0 2’0 0’8 - ;:;
;: 3’8 0’5 1’6
3’8 1’6 1’1 0’5 0’8 - 1’7
3’:; $5” ;:;:
1% 3’8 1’7 1’1 0’8 0’8 1’4 1’8
150 ;:; 1’2 0’8 2’5 ;:s” 1’4 1’9 1’8
33:; 3:; 1’2 0’8 2’5
185 1’4 2’0 1’9
G 240 3’8 3’8 2’0 1’3 0’8 2’5 0’8 1’4 2’1 2’0
300 3’8 3’8 2’1 1’4 0’8 3’15 0’8 1’4 2’2 2’1
400 3’8 2’3 0’8 3’15 0’8 1’4 2’4 2’3
;:; ;:;
500 3’8 2’4 0’8 4’0 0‘8 1’4 2’6 2’4
630 3’8 3’8 2’6 1’7 0’8 4’0 0’8 1’4 2’8 2’6
 Table 18 Dimensions for 6*35/11 kV ( Earthed ) Three-Core Belted Cables

Nominal Thickness of Thickness of Lead Thickness of Extru- Nominal Dimension of Extruded PVC $
cross Insulation or Lead-Alloy ded Bedding for Armour Serving
Section C-----h_---_~ Shea& h_---_------, ,__----h-----7
Armourcd Cables r----------
Between Between Steel Round Steel Strips ’ Thickness Thickness
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter #__-_*---.y Unarmoured ArE;;zsd
Type Type Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
mm* mm mm mm mm mm mm mm mm mm
16 5’3 3’8 1’3 0’8 0’5 2’0 0’8 - Em 1’4
25 5’3 3’8 1’3 0’9 0’5 2’0 0’8 - 1’4 1’4
35 5’3 3’8 1’4 0’9 0’5 2’0 0’8 - 1’5 1’5
50 5’3 3’8 1’5 1’0 0’5 2’0 0’8 - 1’5 1’5
70 5’3 3’8 1’6 1’0 0’5 2’0 0’8 - 1’6 1’6
95 5’3 3’8 1’8 1’1 0’8 2’5 0’8 1’4 1’7 1’7
120 5’3 3’8 1’8 1’2 0’8 2’5 0’8 1’4 1’8 1’8
150 5’3 3’8 1’8 1’2 0’8 2’5 0’8 1’4 1’9 1’9
185 5’3 3’8 1’9 1’3 0’8 2’5 0’8 1’4 2’0 1’9
240 5’3 3’8 2’1 1’4 0’8 3’15 0’8 1’4 2’1 2’1
300 5’3 3’8 2’2 1’4 0’8 3’15 0’8 1‘4 2’3 2’2
400 5’3 3’8 2’4 1’6 0’8 3’15 0’8 1’4 2’5 2’3
500 5’3 3’8 2’6 1’7 0’8 4’0 0’8 1’4 2’3 2’5
630 5‘3 3’8 2’6 1’8 0’8 4’0 0’8 1’4 2’8 2’6
 Table 19 Dimensions for ll/ll kV ( Unearthed ) Three-Core Belted Cables

Nominal Thickness of Thickness of Lead Thickness of Extru- Nominal f;;;;;ions of Extruded PVC
cross Insulation or Lead-Alloy ded Bedding for Serving
Section r--- ------- -7 Sheath Armoured Cables ~_~~__~~~_.~~~~_~~~~__~ r----- h_-----
Between Between Steel Round Steel Strips Thickness Thickness
Conductors Conductor Tape Steel Wire Thickness for for
and Sheath Thickness Diameter r_-_*_--T Unarmoured Armoured
Type Type Cables Cables
(4 (b)
(1) (4) (5) (6) (7) (8) (9) (10) (11)
mm2 mm mm mm mm mm mm
16 1’4 0’9 0’5 2’0 0’8 1’4 1’4
25 1’4 0’9 0’5 2’0 0’8 - 1’5 1’5
35 1’5 1’0 0’5 2’0 0’8 - 1’6 1’6
50 1’5 1’0 0’5 2’0 0’8 - 1’6 1’6
IO 1’7 1’1 0’8 2’5 0’8 1‘7 1’7
95 1’7 1’2 0’8 2’5 0’8 1’8 1’8
120 1’8 1’2 0’8 2’5 0’8 1’9 1’9
N 150 1’9 1’3 0’8 2’5 0’8 2’0 1’9
185 2’0 1’3 0’8 2’5 0’8 2’1 2’0
240 2’2 1’4 0‘8 3’15 0’8 2’2 2’1
300 2‘2 1’5 0’8 3’15 0’8 2’4 2’2
400 2’5 1’6 0’8 4’0 0’8 2’6 2’4
500 2’7 1’7 0’8 4’0 0’8 2’7 2’5
630 2’1 1’8 0’8 4’0 0’8 2’9 2’7
 Table 20 Dimensions for 6,X/11 kV ( Earthed ) Three-Core Screened Cables

Thickness of Thickness of Lead Thickness of Extru- Nominal Dimensions of Extruded PVC

NCrza’ Insulation or Lead-Alloy ded Bedding for Armour Serving
Section r----_ A-----7 Sheath Armoured Cables CI--------h----------~ ~~~~~-__-~~~
Between Between Steel Round Steel Strips Thickness
Conductors Conductor Tape Steel Wire Thickness for Thi%ess
and Sheath Thickness Diameter (-----*---~ Uyartyeyred A;-rcu:‘d
‘We Type
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
mm’ mm mm mm mm mm mm mm mm mm mm
16 3’3 3’3 1’4 0’9 0’5 2’0 0’8 - 1’4 1’4
25 3’3 3’3 1’4 0’9 0’5 2’0 0’8 - 1’4 1’4
35 3.3 3’3 1’5 0’9 0’5 2’0 0’8 - 1’5 1’5
50 3’3 3’3 1’5 1’0 0’5 2’0 0’8 - 1’6 1’6
.70 3’3 3’3 1’5 1’0 O’S 2’0 0’8 - 1’7 1’6
95 3’3 3’3 1’7 1’1 0’8 2’5 0’8 1’4 1’8 1’7
120 3’3 3’3 1’8 1’2 0’8 2’5 0’8 1’4 1’8 1’8
h) 150 3’3 3’3 1’9 1’2 0’8 2’5 0’8 1’4 1’9 1’9
N
185 3’3 3’3 2’0 1’3 0’8 2’5 0’8 1’4 2’0 2’0
240 3’3 3’3 2’1 1.4 0’8 3’15 0’8 1’4 2’2 2’1
300 3’3 3’3 2’2 1’4 0’8 3’15 0’8 1’4 2’3 2’2
400 3’3 3’3 2’4 1’6 0’8 3’15 0’8 1’4 2’5 2’3
 Table 21 Dimensions for ll/ll kV ( Unearthed ) Three-Core Screened Cables

Nominal Thickness of Thickness of Thickness of Extruded Nominal Dimensions Extruded PVC

Cl-O&S Insulation Lead or Lead Bedding for Armoured of Armour Serving
Section Alloy Sheath Cables r---------- h__________~ r-_I--h__--~
Steel Round Steel Steel Strips Thickness Thickness
Tape Wire Thickness for for
Thickness Diameter r_--h--_~ Unarmou- Armoured
Type Type red Cables Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (IO)
mma mm mm mm mm mm mm mm mm mm
16 4’6 1’6 1’0 0’5 2’0 0’8 - 1’5 1’5
25 4’6 1’6 1’0 0’5 2’0 0‘8 - 1’6 1’6
35 4’6 1’6 1’0 0’5 2’0 0’8 - 1’6 1‘6
50 4’6 1’7 1’1 0’8 2’5 0’8 1’4 1’7 1’7
70 4’6 1‘8 I’1 0’8 2’5 0’8 1’4 1’8 1’8
95 4’6 1’9 1’2 0’8 2’5 0’8 1’4 1’9 1’9
-:_g 120 4’6 2’0 1’3 0’8 2’5 0’8 1’4 2’0 1’9
150 4’6 2’1 1’3 0’8 2’5 0’8 1’4 2’1 2’0
185 4’6 2’1 1’4 0’8 3’15 0’8 1’4 2’2 2’1
240 4’6 2’2 1’5 0’8 3’15 0’8 1’4 2’3 2’2
300 4’6 2’4 1’5 0’8 3’15 0’8 1’4 2’5 2’3
400 4’6 2’6 1’7 0’8 4’0 0’8 1’4 2’7 2’5
 z
br

Table 22 Dimensions for 12*7/22 kV ( Earthed ) Three-Core Screened Cables s

..
5:
Thickness of Thickness of Lead Thickness of Extru- Nominal DiE;;;ions of Extruded PVC 2
NzY Insulation or Lead-Alloy ded Bedding for Serving
Section Sheath Armoured Cables T--C-__----A-_-_-____-~ r_-----~_----l
Steel Round Steel Strips Thickness Thickness
Tape Steel Wire Thickness for for
Thickness Diameter t---h--_ 1 Unarmoured Armoured
Type Type Cables Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
mm* mm mm mm mm mm mm mm mm mm
25 5’8 1’8 1’1 0’8 2’5 0’8 1’4 1’7 1’7
35 5’8 1’8 1’1 0’8 2’5 0’8 1’4 1’8 1’8
50 5’8 1’9 1’2 0’8 2’5 0’8 1’4 1’9 1’8
70 5’8 2’0 1’2 0’8 2’5 0’8 1’4 2’0 1’9
95 5’8 2’0 1’3 0’8 2’5 0’8 1’4 2’1 2’0
120 5’8 2’2 1’4 0’8 3’15 0’8 1’4 2’2 2’1
150 5’8 2’2 1’4 0’8 3’15 0’8 1’4 2’3 2’1
185 5’8 2’3 1’5 0’8 3’15 0’8 1’4 2’4 2’2
240 5’8 2’5 1’6 0’8 3’15 0’8 1’4 2’5 2’3
300 5’8 2’6 1’6 0’8 4’0 0’8 1’4 2’6 2’4
400 5’8 2’8 1’8 0’8 4’0 0’8 1’4 2’8 2’6
 Table 23 Dimensions for 19/33 kV ( Earthed ) Three-Core Screened Cables

Nominal Thickness of Thickness of Lead Thickness of Extru- Nominal Dimensions of Extruded PVC
cross Insulation or Lead-Alloy ded Bedding for Armour Serving
Section Sheath Armoured Cables r .----------~_---_--_--~ r-_--_- *-------
Steel Round Steel Strips Thickness Thj;fness
Tape Steel Wire Thickness for
Thickness Diameter C----- --7 Unarmoured Armoured
Type Type Cables Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
mm* mm mm mm mm mm mm mm mm mm
70 8’0 2’3 1’4 0’8 3’15 0’8 1’4 2’3 2’1
95 7’6 2’3 1’4 0’8 3’15 0’8 1’4 2’3 2’2
120 7’6 2’4 I’5 0’8 3’15 0’8 1’4 2‘4 2’3
150 7’1 2’4 1’5 0’8 3’15 0’8 1’4 2’4 2’3
185 7’1 2’5 1’6 0’8 3’15 0’8 1’4 2’5 2’4
240 7’1 2’7 1’7 0’8 4’0 0’8 1’4 2’7 2’5
300 7’1 2’7 1’7 0’8 4’0 0’8 1’4 2’8 2’6
!z
400 7’1 2’8 1’9 0’8 4’0 0’8 1’4 3’0 2’7
 Table 24 Dimensions for 12.4/22 kV ( Earthed ) Three-Core Screened SL Cables

Nominal Thickness of Thickness of Thickness of Extru- Nominal Dimensions Extruded PVC

CkOSS Insulation Lead or Lead of Armour Serving
ded Bedding for
Section Alloy Sheath Armoured Cables c---------- h--_--_-_---- 1
_----_-_--h-------~
Steel Round Steel Steel Strips Thickness Thickness.
Tape Wire Thickness for for
Thickness Diameter r-b- h-__T Unarmoured Armoured
Type Type Cables Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (IO)
mm’ mm mm mm mm mm mm mm
25 -5.8 1’1 0’8 0’8 2’5 0’8 1’4 1’9 1’8
3.5 5’8 1’2 0’8 0’8 2’5 0’8 1’4 1’9 1’8
50 5’8 1’2 0’8 0’8 2’5 0’8 1’4 2’0 1’9
70 5’8 1’3 0’8 0’8 2’5 0’8 1’4 2’2 2’0
95 5’8 1’3 O’S O-8 3’15 0’8 1.4 2’2 2‘0
120 5’8 1’4 0’9 0’8 3’15 0’8 1’4 2’3 2’1
150 5’8 1’4 0’9 3’15 0’8 1’4 2’4 2’2
“8
185 5’8 1’5 0’9 0’8 3’15 0’8 1’4 2’5 2’3
240 5’8 1’6 1’0 0’8 4‘0 0‘8 1’4 2’6 2’4
300 5’8 1’6 1’0 0’8 4’0 0’8 1’4 2’8 2’5
400 5’8 1’7 1’0 0’8 4’0 0’8 1’4 3’0 2’6
 Table 25 Dimensions for 19/33 kV ( Earthed ) Three-Core Screened SI. Cables

Nominal Thickness of Thickness of Lead Thickness of Extru- Nominal Dimensions of Extruded PVC
Cross Insulation or Lead-Alloy ded Bedding for Armour Serving
Section Sheath Armoured Cables r ----------- ------------7 c- - ---__*_--.-__7
Steel Round Steel Strips Thickness Thickness
Tape Steel Wire Thickness for for
Thickness Diameter r----h-- -7 Unarmoured Armoured
Type Type Cables Cables
(a) (b)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
mm2 mm mm mm mm mm mm mm mm mm
70 8’0 1’4 0’9 0’8 3’15 0’8 1’4 2’4 2’2
95 7’6 1’4 0’9 0’8 3’15 0’8 1’4 2’5 2’2
120 7‘6 1’5 0’9 0’8 3’15 0‘8 1’4 2’5 2.3
150 7’1 1’5 0’9 0’8 4’0 0’8 1’4 2’6 2’3
185 7’1 1’5 1’0 0’8 4’0 0’8 1’4 2’7 2’4
240 7’1 1’6 1’0 0’8 4’0 0’8 1’4 2’8 2’5
300 7’1 1’7 1’0 0’8 4’0 0’8 1’4 2’9 2’6
400 7’1 1.8 1’1 0’8 4’0 0’8 1’4 3’2 2’8
IS 692 : 1994

ANNEX A
( Clause 2 )
LIST OF REFERRED INDIAN STANDARDS

IS No. Title IS No. Title

1885 Electrotechnical vocabu- ( Part 7 ) : 1984 Tensile strength and
(Part 32) : 1971 lary: Part 32 Cables, con- elongation at break of
ductors and accessories for thermoplastic and elasto-
electricity supply meric insulation and sheath
( Part 8 ) : 1984 Breaking strength and
3975 : 1988 Mild steel wires, formed elongation at break for
wires and tapes for impregnated paper insu-
armouring of cables ( third lation
revision )
( Part 10) : 1984 Loss of mass test
4905 : 1968 Method for random samp- ( Part 12 ) : 1984 Shrinkage test
ling ( Part 15 ) : 1984 Hot deformation test
5831 : 1984 PVC insulation and sheath ( Part 24 ) , 1984 Water soluble impurities
of electric cables (first test of insulating paper
revision ) ( Part 25 ) : 1984 Conductivity of water ex-
tract test of insulating
8130 : 1984 Conductors for insulated paper
electric cables and flexible
( Part 26 ) : 1984 pH value of water extract
cords (Jirst revision )
test of insulating paper
10418 : 1982 Drums for electric cables ( Part 27 ) : 1984 Ash content test of insulat-
10810 Methods of test for cables: ing paper
( Part 34 ) : 1984 Measurement of thickness
( Part 1 ) : 1984 Annealing test for wires of metallic sheath
used in conductors
( Part 36 ) : 1984 Dimensions of armouring
( Part 2 ) : 1984 Tensile test for aluminium material
wires
( Part 45 ) : 1984 High voltage test
( Part 3 ) : 1984 Wrapping test for aluminium ( Part 47 ) : 1984 Impulse test
wires
( Part 48 ) : 1984 Dielectric power factor test
( Part 5 ) : 1984 Conductor resistance test ( Part 50 ) : 1984 Bending test
(Part 51) : 1984 Dripping test
( Part 6 ) : 1984 Thickness of thermo-
plastic and elastomeric ( Part 52 ) : 1984 Drainage test
insulation and sheath ( Part 53 ) : 1984 Flammability test

ANNEX B
( Clause 5.2 )
CHEMICAL CHARACTERISTICS OF INSULATION PAPER

B-I Chemical characteristics of insulating paper shall be as given below:

Characteristics Requirement For Test Methods, Ref
Part No. of IS 10810
Water soluble impurities 1.0 percent, Max 24
Conductivity of water extract 100 &cm, Max 25
pH value of water extract 6.5 to 8.0 26
Ash content l-5 percent, Max 27

28
 ANNEX C
( Clause 10.4 )

COMPOSITION OF LEAD AND LEAD-ALLOY SHEATH

Material Description Composition ( Percentage by Mass )

r--- ---_---_-_-_---_-~_--__-_-_---~_-___-_--- ---_----------_--~
Antimony Tin Tellurium Silver Copper Bismuth Zinc Total Other Lead
r----_-7 r---h ___~ Max Max Max Max Max Elements Min
Min Max Min Max Max
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13)
Lead Lead - 0.15 - 0.1 0.005 0.005 0.06 0.05 0.002 0.01 99.8
Alloy B O-85 percent 0.80 0.95 - 0.01 0.005 0.005 0.06 0.05 0.002 0.01 Remainder
antimony
Alloy E 0.4 percent 0.15 0.25 0.35 o-45 0.005 0.005 0.06 0.05 0.002 0.01 Remainder
tin, 0.2 per-
cent antimony
IS 692 : 1994

ANNEX D
( Clause 24.2.1 )

SAMPLING OF CABLES

D-l LOT D-2.2.1 In order to ensure the randomness of

D-l.1 In any consignment, the cables of the same seiection, random number tables shall be used
size manufactured under essentially similar ( IS 4905 : 1968 ).
conditions of production shall be grouped
together to constitute a lot. D-3 NUMBER OF TESTS AND CRITERION
D-2 SCALE OE SAMPLING FOR CONFORMITY
D-2.1 Samples shall be taken and tested from
D-3.1 Suitable lengths of test samples shall be
each lot for ascertaining the conformity of the
taken from each of the drum selected. These
lot to the requirements of the specification.
test samples shall be subjected to each of the
D-2.2 The number of samples to be selected acceptance tests ( 24.2 ). A test sample is called
shall depend on co1 1 and 2 as indicated below. defective if it fails in any one of the acceptance
The samples shall be taken at random. tests. If the number of defective is less than or
Number of Drums in Number of Permissible equal to the corresponding permissible number
the Lot Drums to be Number given in co1 3, under D-2.2 the lot shall be
Taken as of declared as conforming to the requirements of
Sample Defectives acceptance tests; otherwise not.
(1) (2) (3)
N n
up to 50 2 :
51 to 100 5
101 to 300 :
301 to 500 :;
501 and above 32

30
( Continued front second cover )
TABLE 7 D~MBNS~ONS
FOR ll/ll KV ( EARTHED ) SINGLE-CORE ( UNARMOUR~D ) SCREENING
CABLES 11
TABLE 8 DIMENSIONS FOR 12,7/22 KV ( EARTHED) SINGLE-C• RB ( UNARMOURED ) SCREENING
CABLE 11
TABLE 9 DIMENSIONSFOR 19/33 KV ( EARTHED ) SINGLE-C• RB ( UNARMOURED ) SCREENING 11
TABLE 10 DIMENSIONSFOR O-65/ 1-l KV ( EARTHEDOR UNEARTHED) TWO-CORE BELTEDCABLES 12
TABLB 11 DIMENSIONSFOR 0.65/1-l KV ( EARTHED OR UNEARTHED) THREE-CORE BELTEDCABLES 13
TABLB 12 DIMBNSIONSFOR 0*65/1*1 KV ( EARTHED OR UNEARTHED) THREE-AND-A-HALF CORE
CABLES 14
TABLE 13 DIMENSIONS FOR O-65/1*1 KV ( EARTHED OR UNEARTHED) FOUR-CORE BELTED
CABLBS 15
TABLE 14 DIMENSIONS FOR 1*9/3*3 KV ( EARTHED ) THREE-C• RB BELTBDCABLES 16
TABLE 15 DIMENSIONSFOR 3*3/3.3 KV ( UNEARTHED) THREE-COREBELTEDCABLES 17
TABLE 16 DIMENSIONSFOR 3.816.6 KV ( EARTHED ) THREE-CORE BBLTEDCABLES 18
TABLE 17 DIMENSIONSFOR 6.6/6*6 KV ( UNEARTHBD) THREE-CORE BELTED CABLES 19
TABLE 18 DIMENSIONSFOR 6.35111 KV ( EARTHED ) THREE-CORE BELTED CABLES 20
TABLE 19 DIMENSIONSFOR 11/l 1 KV ( UNEARTHED) THREE-COREBELTEDCABLES 21
TABLE 20 DIMENSIONS FOR 6.35111 KV ( EARTHED ) THREE-CORE SCREENBDCABLES 22
TABLE 21 DIMENSIONS FOR 1 l/l 1 KV ( UNBAR~HBD ) THREE-CORE SCREENEDCABLES 23
TABLB 22 DIMENSIONSFOR 12*7/22 KV ( EARTHED ) THREE-C• RB SCREENEDCABLES 24
TABLE 23 DIMBN~ION~ FOR 19/33 KV ( EARTHED ) THRHE-CORESCREENEDCABLES 25
TABLE 24 DIMENSIONS FOR 12.4/22 KV ( EARTHED ) THREB-CORESCREENEDSL CABLES 26
TABLE 25 DIMENSIONSFOR 19/33 KV ( EARTHED ) THREE-CORESCREENEDSL CABLES 27
ANNEX A LIST OF REFERREDINDIAN STANDARDS 28
ANNEX B CHEMICAL CHARACTERISTICS
OF INSULATIONPAPER 28
ANNEX C COMPOSITIONOF LEAD AND LEAD-ALLOY SHEATH 29
ANNBX D SAMPLING OF CABLES 30

Power Cables Sectional Committee, ETD 9

FOREWORD

This Indian Standard ( Third Revision ) was adopted by the Bureau of Indian Standards, after the draft
finalized by the Power Cables Sectional Committee had been approved by the Electrotechnical Division
Council.
This standard was originally published in 1957 and subsequently revised in 1965 and 1973. This third
revision has been brought out to take into account the experience gained during this period in the
manufacture of these types of cables in the country and to bring this standard in line with international
practice to the extent considered appropriate.
The correct type of cables should be selected for the system keeping in view whether the system is
earthed or unearthed.
It should be realised that in an electric system where an earth fault is not automatically and promptly
eliminated, the extra stresses on the insulation of the cable during the earth fault reduce the life of
cable to a certain extent. Therefore, if the system is expected to be operated quite often with a prolon-
ged earth fault, it is necessary to select the cables suitable for unearthed system.
In preparing this standard, assistance has been derived from IEC Publications 55-1 ( 1978 ) and
55-2 ( 1981 ) cPaper-insulated metal-sheathed cables for rated voltages up to 18/30 bV : Part 1 Tests
and Part 2 General and constructional requirements ‘, issued by the International Electrotechnical
Commission ( IEC ).
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 ‘Rules for rounding off numerical values ( revised )‘. The number of significant places
retained in the rounded off value should be the same as that of the specified value in this standard.
Bureao of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 2986 to promote
harmonious development of the activities of standardization, marking and quality certification of goods
and attending to connected matters in the country.

Copyright

BIS has the copyrrght of all its publications. No part of these publications may be reproduced in any
form without the prior permission in writing of BIS. This does not preclude the free use, in the course/
of implementing the standard, of necessary details, such as symbols and sizes, type or gra&
designations. Enquiries relating to copyright be addressed to the Director ( Publications ), BIS. ,

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also
reviewed periodically; a standard along with amendments 1s reaffirmed when such review indicates that
no changes are needed; if the review indicates that changes are needed, it is taken up for revision.
Users of Indian Standards should ascertain that they are in possession of the latest amendments or
edition.

This Indian Standard has been developed from Dot : No. ETD 9 ( 2965 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

Headquarters:
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 /’-

AMENDMENT NO. 1 FEBRUARY 2004

IS 692:1994 PAPER INST&ATED LEAD SHEATHED

CABLES FOR RATED VOLTAGE UP TO AND
INCLUDING 33 kV — SPECIFICATION
( Third Revision)

[ Page 1, clause 3.1(c), line 2 ] — Substitute ‘an’~or ‘and’.

( Page 2, clause 7, line 1 ) — Substitute ‘interstices’~or ‘interstitches’.
( Page 2, clause 8, line 4 ) — Substitute ‘copper wires. When applied in
cables, it shall’ for ‘copper wires, when applied in cables, it shall’.
( Page 3, clause 13.1, line 1 ) — Substitute ‘bedding’ for ‘beddin’.
( Page 3, clause 13.1, line 10 ) — Substitute ‘when the’ for ‘whent he’.
( Page 3, clause 14) — Substitute the following for the existing:
’14 PVC COMPOUND
PVC compound for extruded bedding or serving shall comply with the
requiremefi~
ar 1S 5831: 1984.’
~ Page 3, clause 16.1, line 4 ) — Insert the word ‘applied’ in between the
words ‘be’ and ‘helically’.
( Page 4, clause 16.2, line 1 ) — Substitute ‘above, and 3-core screened
and SL cables’ ,for ‘above, and 3-core and 3-core SL cables’.
( Page 4, clause 16.2.1, line 1 ) — Substitute ‘6.35/1 1 kV’ for ‘6.35 kV’.
( Page 4, clause 18.1, line 2 ) — Substitute ’17’ for ‘16’.
( Page 4, clause 18.1, line 3 ) — Substitute ‘interstices’ for ‘interstitches’.
( Page 4, clause 18.2, line 2 ) — Insert ‘and 17’ between ’16’ and ‘shall’.
( Page 4, clause 18.2, line 3 ) — Substitute ‘interstices’ for ‘interstitches’.
( Page 4, clause 18.3, line 5 ) — Substitute ‘interstices’~or ‘interstitches’.

1
 \’

Amend No. 1 to IS 692:1994

( Page 5, clause 21.2.1.2, line 3 ) — Substitute ‘or’ for ‘of’.

( Page 5, clause 21.2.2, line 4 ) — Delete the words ‘and lapped’
[ Page 5, clause 21.2.2(C)] — Substitute the following for the existing:
‘c) One layer of impregnated paper and one layer of impregnated textile
material, both being compounded.’
( Page 5, clause 21.3.1) — Substitute the following for the existing:
‘21.3.1 When an extruded bedding is applied over a lead sheath, it shall be
preferably black.’
( Page 5, clause 22.1.2, last line ) — Substitute ‘wire/strip’ for ‘wire strip’.
( Page 6, clause 23.2) — Substitute the following for the existing
‘23.2 Extruded Outer Sheath for Unarmored or Armoured Cables
This shall be preferably black.’
( Page 6, clause 23.2.1, line 7 ) — Insert the words ‘(ts) by more than 0.2 ts’
in between ‘value’ and ‘+ 0.2 mm’.
( Page 6, clause 23.2.1.1) — Delete the clause number ‘23.2.1.1’ and retain
the contents of this clause as second paragraph of 23.2.1.
[ Page 6, clause 24.l(b), col 2 ] — Substitute ‘IS 8130:1984’ for ‘1S 8130:.
1994’. .,,

[ Page 6, clause 24.l(j), CO12, line 2 ] — Substitute ‘23.2.1’ for ‘23.3’.

[ Page 6, clause 24.1(Q ] — Substitute the following for the existing text:
‘k) Test for physical properties of extruded PVC bedding and serving:

1) Tensile strength and IS 5831:1984 Part 7 of IS 10810

elongation at break
2) Loss of mass in air oven do Part 10 of IS 10810
3) Shrinkage test do Part 12 of IS 10810
4) Hot deformation test do Part 15 of IS 10810
5) Ageing test do Part 11 of~s 10810
6) Heat shock test do Part 14 of IS 10810
7) Thermal stability test do Part 60 of IS 10810
——
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 Amend No. 1 to IS 692:1994

( Page 7, clause 24,6, line 1 ) — Substitute ‘IS 10810 (Part 8) :1984’ for
‘1S 10810 (Part 8) :1964’.
( Page 7, clause 24.6, line 4 ) — Substitute ’700 N/mm’ for ’700 N mm’.
( Page 7, clause 24.8.3, line 3 ) — Substitute ‘the’ for ‘and’.
( Page 7, clause 24.8.3, line 4 ) — Substitute ‘(9.5 kV)’ for ‘9.5 kV’.
( Page 8, Informal table under clause 24.8.3, CO1 3, heading, line 7 ) —
Substitute ‘(9.5 kV)’ for ‘9.5 k~.
( Page 8, table under clause 24.9.2, CO!4 ) — substitute ’17’for ’25’ and
‘2s’ for ‘17’ against rated voltages ‘6.35/11‘ and ‘11/11‘ re.s@vely under
column i.
( Page 8, clause 24.13) — Substitute the following for the existing clause:
‘24.13 Bending Test for Finished Cables
24.13.1 The test shall be carried out in accordance with IS 10810 (Part 50) :
1984. The diameter of test cylinder shall not exceed the following:

1 VoItage Rating, kV Single Core Multi core

Unarruoured Armoured
~
20 D’) 15 Dl) 12 D’)
12.7/22 ~ D]) 20 Dl) 15 D’)
19/33 30 D’) 25 Dl) 20 D’)
~serveddia of cable sMWJl~.

24.13.2 After the bending cycles have been completed the cable sample shall be
subjected to the voltage test specified in 24.9.2 except that the test voltage shall
be increased by 50 percent.
24.13.3 After this test, the sample shall be examined visually. The bending
performance of the cable shall be deemed satisfactory when:
a) the Cable sample withstands the applied voltage test without failure;
and
b) the Visual examination shows that the serving is free tlom splits, the
arrnour is not noticeably displaced and the sheath is free from splits or
cracks.’

3
Amend No. 1 to IS 692:1994

( Page 9, clause 26.1, line 4 ) — Substitute ‘4.0 x 0.8 mm’ for ‘0.4 x
0.8 mm’.
( Page 20, Table 18, col 10, row 13) — Substitute ‘2.7’ for ‘2.3’ against the
nominal cross section ’500 mm2 indicated under column 1.
( Page 22, Table 20,CO12 ) — Delete the words ‘Between Conductors’ from the
heading.
( Page 22, Table 20, col 3 ) — Delete.
( Page 29, Annex C ) — Substitute ‘Clause 10’ for ‘Clause 10.4’ in the
clause reference given below Annex C.

(ET09)

Reprography Unit, BIS, New Delhi, India