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IS 8130 : 2013
(Reaffirmed 2018)
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Indian Standard
CONDUCTORS FOR INSULATED ELECTRIC CABLES
AND FLEXIBLE CORDS — SPECIFICATION
( Second Revision )

ICS 29.060.20

© BIS 2013
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

October 2013 Price Group 4

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Power Cables Sectional Committee, ETD 09

FOREWORD
This Indian Standard (Second 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 1976 and was subsequently revised in 1984. This revision has been
undertaken to bring it in line with International practices.
During the first revision of this standard, the conductors were divided into different classes, the flexibility of the
conductor increasing with the class number. The number of classes of conductor were reduced to four. There are
two classes of conductors for cables for fixed installations; Class 1 is for solid conductors only and Class 2 is for
stranded conductors. For flexible conductors also there are two classes; as these correspond closely with Classes
5 and 6 of the previous edition, those class numbers have been retained to preserve continuity and avoid any
confusion. Classes 3 and 4 were omitted, since they have had relatively little use and Classes 2 and 5 respectively
were considered suitable for most of the applications for which Classes 3 and 4 had been employed.
Also during the first revision, the number of different specified maximum resistance values for different types of
conductor of the same nominal cross-sectional area were reduced. The flexible aluminium conductors for welding
cables were also included. Also the details about methods of various tests which were taken out from this standard
were covered in a separate standard, to which reference were made at appropriate places.
Major changes in this revision include the following:
a) Addition of a definition for nominal cross-sectional area and segmental conductor.
b) An increase in the range of conductor sizes in Table 2.
c) A new type of conductor has been added, that is segmental conductor.
While formulating this standard, assistance has been derived from IEC 60228 (2004) ‘Conductors of insulated
cables’, 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 or analysis, 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.
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IS 8130 : 2013

Indian Standard
CONDUCTORS FOR INSULATED ELECTRIC CABLES
AND FLEXIBLE CORDS — SPECIFICATION
( Second Revision )

1 SCOPE 3.2 Nominal Cross-Sectional Area — Value that

identifies a particular size of conductor but is not
1.1 This standard specifies the properties and
subject to direct measurement.
construction of copper and aluminium conductors for
insulated electric cables and flexible cords. 3.3 Segmental Conductor — Circular conductor
consisting of number of shaped or segment conductor
1.2 This standard does not apply to,
and each separated by suitable separator. The number
a) conductors for use in coils of machines or of segments or sector shaped conductor can be 4, 5 or 6.
apparatus; NOTE — Each particular size of conductor in this standard is
b) conductors without insulation, for use in aerial required to meet a maximum resistance value.
lines;
4 MATERIAL
c) conductors for telecommunication purposes;
and 4.1 Aluminium
d) conductors of special design, for example,
hollow-core conductors. The material for conductor shall consist of plain
aluminium. It shall be one of the following grades with
2 REFERENCES the corresponding tensile strength limits:
The following standards contain provisions which,
through reference in this text, constitute provisions of Grade Tensile Strength, N /mm2
this standard. At the time of publication, the editions
0 Up to and including 100
indicated were valid. All standards are subject to
H2 Above 100 and up to and including 150
revision, and parties to agreements based on this
H4 Above 150
standard are encouraged to investigate the possibility
of applying the most recent editions of the standards
indicated below. a) For shaped solid conductors and the welding
cable conductors, only Grade 0 aluminium
IS No. Title shall be used;
613 : 2000 Copper rods and bars for electrical b) For conductors of cross-sectional area up to
purposes and including 10 mm 2, H2 or H4 Grade
1885 (Part 32) : Electrotechnical vocabulary: Part 32 aluminium shall be used; and
1993/IEC Electric cables c) For the remaining conductors, aluminium of
50-461 : 1984 Grade 0, H2 or H4 may be used.
10810 Method of test for cables:
(Part 1) : 1984 Annealing test for wires used in 4.2 Copper
conductors
The conductors shall be made from high conductivity
(Part 2) : 1984 Tensile test for aluminium wires
copper rods complying with IS 613. The conductors
(Part 3) : 1984 Wrapping test for aluminium wires
shall consist of tinned or untinned annealed copper as
(Part 4) : 1984 Persulphate test of conductor
may be specified.
(Part 5) : 1984 Conductor resistance test

3 TERMINOLOGY 4.3 Form of Conductor

For the purpose of this standard, the definitions given The conductors shall be solid, circular, shaped,
in IS 1885 (Part 32) and the following shall apply. compacted, stranded or bunched as required by the
appropriate cable specification. The conductor shall
3.1 Metal Coated — Coated with a thin layer of be clean, reasonably uniform in size and shape, smooth
suitable metal, such as tin or tin alloy. and free from harmful defects.

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IS 8130 : 2013

4.4 Joints in Conductor 6.3.3 The number of wires in the conductor shall be
not less than appropriate minimum number given in
4.4.1 Stranded Conductors
Table 2.
Joints shall be permitted in the individual wires of
which the conductor is formed, but no joint shall be 6.4 Flexible Conductors (Classes 5 and 6)
within 300 mm of any other joint within the same layer. 6.4.1 Conductor shall consist of plain or tinned
The joints shall be made by resistance butt welding, annealed copper.
fusion welding, cold pressure welding, electric
welding, gas welding, brazing or silver soldering. 6.4.2 The wires in the conductor shall have same
nominal diameter before bunching.
4.4.2 Solid Conductors (Aluminium Conductors only)
6.4.3 The diameter of the wires in any conductor shall
No joints shall be made in the finished solid conductor. not exceed the appropriate maximum value given in
Table 3 for Class 5 and Table 4 for Class 6 conductors.
5 CLASSIFICATION
5.1 The conductors have been divided into four classes 6.5 Flexible Aluminium Conductors for Welding
as follows : Cables

a) Cables for fixed installations Classes 1 and 2 6.5.1 Conductor shall consist of plain aluminium.
b) The flexibles Classes 5 and 6 6.5.2 The wires in the conductor shall have same
c) Copper welding cables Class 6 nominal diameter before stranding.
5.2 Aluminium conductors for welding cables have not 6.5.3 The diameter of wires in any conductor shall not
been assigned any class number. exceed the appropriate maximum value given in
Table 5.
6 CONSTRUCTION
7 TESTS
6.1 Solid Conductor (Class 1)
7.1 Tests for Copper Conductors
6.1.1 The conductor shall consist of single wire of plain
or tinned annealed copper or plain aluminium in 7.1.1 Persulphate Test (for Tinned Copper only)
accordance with Table 1. This test shall be carried out in accordance with
6.1.2 Solid copper conductor shall be of circular cross- Method B given in IS 10810 (Part 4). The mass of
section. copper dissolved shall not exceed the appropriate value
given below:
6.1.3 Solid aluminium conductor of sizes from 10 mm2
up to and including 35 mm2 shall be of circular cross- Wire Diameter Permissible Mass of
section. Sizes 35 mm2 and above may be of either Copper Dissolved, Max
circular or shaped cross-section. mm g/m2
6.2 Stranded Circular Non-compacted Conductors Up to and including 0.41 5
(Class 2)
Above 0.41 3
6.2.1 Conductor shall consist of plain or tinned
annealed copper or plain aluminium. 7.1.2 Annealing Test
6.2.2 The wires in the conductor shall have the same 7.1.2.1 Before standing
nominal diameter before stranding.
This test shall be carried out in accordance with
6.2.3 The number of wires in the conductor shall be IS 10810 (Part 1). The elongation shall be not less than
not less than the appropriate minimum number gives the appropriate value given below:
in Table 2.
Wire Diameter Elongation, Min
6.3 Stranded Compacted Circular Conductors and
Shaped Conductors (Class 2) Over Up to and Including
mm mm Percent
6.3.1 Conductor shall consist of plain or tinned
annealed copper or plain aluminium. — 0.21 9.0
0.21 0.41 13.5
6.3.2 The ratio of the diameters of two wires before 0.41 1.36 18.0
stranding in the same conductor shall not exceed 2. 1.36 — 22.5

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IS 8130 : 2013

7.1.2.2 After stranding for welding cables shall have a minimum of 12 percent
elongation.
Under consideration.

7.2 Tests for Aluminium Conductors 7.3 Resistance Test (for Both Copper and
Aluminium)
7.2.1 Tensile Test
This test shall be done on the finished conductors in
This test shall be carried out in accordance with accordance with IS 10810 (Part 5). The dc resistance
IS 10810 (Part 2). The sample shall meet the following of the conductor shall be measured at room temperature
requirements: and corrected to 20°C by means of the appropriate
a) Before stranding — The tensile strength of factors given in Table 6.
any of the wires shall comply with the values 7.3.1 The corrected dc resistance shall not exceed the
given in 3.1. values given in the appropriate Table 1 to Table 5.
b) After stranding — The tensile strength of any
of the wires shall be not less than 95 percent 8 PACKING AND MARKING
of the minimum values given in 3.1.
8.1 The conductor shall either be wound on reels or
NOTE — This test for wires taken from stranded drums or supplied in coils packed and labelled. The
conductors is not applicable in the case of compacted
circular conductors or shaped conductors.
label shall contain the name of the manufacturer, trade
name, if any; size and length of the conductor.
7.2.2 Wrapping Test
NOTE — The requirements of packing and marking are not
This test shall be done in accordance with IS 10810 applicable when the processing of the conductor forms part of
(Part 3). The criteria for passing is that the wire shall the manufacturing of complete cable.
not break.
8.2 BIS Certification Marking
NOTE — This test is not applicable to shaped solid conductors,
wires taken from stranded conductors in case of compacted The conductor (reel, drum or label) may also be marked
circular or shaped conductors and wires used for welding cable with the Standard Mark.
conductors.
8.2.1 The use of the Standard Mark is governed by the
7.2.3 Annealing Test
provisions of the Bureau of Indian Standards Act, 1986
This test is applicable to shaped solid conductor and and the Rules and Regulations made thereunder. The
wires of conductor (before stranding) for welding details of conditions under which a license for the use
cables only. The test shall be carried out in accordance of the Standard Mark may be granted to the
with IS 10810 (Part 1). Shaped solid conductors shall manufacturers or producers may be obtained from the
have a minimum of 25 percent and wires of conductor Bureau of Indian Standards.

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IS 8130 : 2013

Table 1 Solid Conductors for Single Core and Multicore Cables (Class 1)
(Clauses 6.1.1 and 7.3.1)
Sl No. Nominal Cross-Sectional Maximum Resistance of Conductor at 20° C
Area
Circular Copper Conductors Aluminium Conductors
Circular or Shaped
Plain Tinned
mm2 Ω/km Ω/km Ω/km
(1) (2) (3) (4) (5)
i) 0.5 36.0 36.7 —
ii) 0.75 24.5 24.8 —
iii) 1 18.1 18.2 —
iv) 1.5 12.1 12.2 —
v) 2.5 7.41 7.56 —
vi) 4 4.61 4.70 —
vii) 6 3.08 3.11 —
viii) 10 1.83 1.84 3.082)
ix) 16 1.15 1.16 1.912)
x) 25 0.7271) — 1.202)
xi) 35 0.5241) — 0.8682)
xii) 50 0.3871) — 0.641
xiii) 70 0.2681) — 0.443
xiv) 95 0.1931) — 0.3203)
xv) 120 0.1531) — 0.2533)
xvi) 150 0.124 1) — 0.2063)
xvii) 185 — — 0.1643)
xviii) 240 — — 0.1253)
xix) 300 — — 0.1003)
1)
The solid copper conductors having nominal cross-sectional areas of 25 mm2 and above are intended for particular types of cables
only and not for general purpose.
2)
Aluminium conductors 10 mm2 to 35 mm2 circular only.
3)
For single core cables, four sectoral shaped conductor may be assembled into a single circular conductor.

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IS 8130 : 2013

Table 2 Stranded Conductors for Single Core and Multicore Cables (Class 2)
(Clauses 6.2.3, 6.3.3 and 7.3.1)
Sl No. Nominal Cross- Minimum Number of Wires in the Maximum Resistance of Conductor
Sectional Area Conductor at 20°C
Circular Conductor Circular Copper Conductor Aluminium
(Non-Compacted) Compacted or Conductor
Shaped Conductor
Plain Wires Tinned Wires
mm2 Cu Al Cu Al Ω/km Ω/km Ω/km
(1) (2) (3) (4) (5) (6) (7) (8) (9)
i) 1 3 — — — 18.1 18.2 —
ii) 1.5 3 3 — — 12.1 12.2 18.1
iii) 2.5 3 3 — — 7.41 7.56 12.1
iv) 4 7 3 — — 4.61 4.70 7.41
v) 6 7 3 — — 3.08 3.11 4.61
vi) 10 7 7 6 — 1.83 1.84 3.08
vii) 16 7 7 6 6 1.15 1.16 1.91
viii) 25 7 7 6 6 0.727 0.734 1.20
ix) 35 7 7 6 6 0.524 0.529 0.868
x) 50 19 19 6 6 0.387 0.391 0.641
xi) 70 19 19 12 12 0.268 0.270 0.443
xii) 95 19 19 15 15 0.193 0.195 0.320
xiii) 120 37 37 18 15 0.153 0.154 0.253
xiv) 150 37 37 18 15 0.124 0.126 0.206
xv) 185 37 37 30 30 0.099 1 0.100 0.164
xvi) 240 61 37 34 30 0.075 4 0.076 2 0.125
xvii) 300 61 61 34 30 0.060 1 0.060 7 0.100
xviii) 400 61 61 53 53 0.047 0 0.047 5 0.077 8
xix) 500 61 61 53 53 0.036 6 0.036 9 0.060 5
xx) 630 91 91 53 53 0.028 3 0.028 6 0.046 9
xxi) 8001) 91 91 53 53 0.022 1 0.022 4 0.036 7
xxii) 1 0001) 91 91 53 53 0.017 6 0.017 7 0.029 1
xxiii) 1 2002) — 3)
— — 0.015 1 0.015 1 0.024 7
xxiv) 1 4002) — 3)
— — 0.012 9 0.012 9 0.021 2
xxv) 1 6002) — 3)
— — 0.011 3 0.011 3 0.018 6
xxvi) 1 8002) — 3)
— — 0.010 1 0.010 1 0.016 5
xxvii) 2 0002) — 3)
— — 0.009 0 0.009 0 0.014 9
xxviii) 2 5002) — 3)
— — 0.007 2 0.007 2 0.012 7
1)
These are segmental conductors.
2)
Can be either stranded or segmental.
3)
The minimum number of wires for these sizes is not specified. These sizes may be constructed from 4, 5 or 6 equal segments
(Milliken).
NOTE — In case 800 and 1 000 square mm if constructed as per segment construction then the minimum number of wires is not
specified. However the number of segments can be 4, 5 or 6.

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IS 8130 : 2013

Table 3 Flexible Copper Conductors for Single Core and Multicore Cables (Class 5)
(Clauses 6.4.3 and 7.3.1)
Sl No. Nominal Cross- Maximum Diameter of Maximum Resistance of Conductor at 20° C
Sectional Area Wires in Conductor
Plain Wires Tinned Wires
mm2 mm Ω/km Ω/km
(1) (2) (3) (4) (5)
i) 0.5 0.21 39.0 40.1
ii) 0.75 0.21 26.0 26.7
iii) 1 0.21 19.5 20.0
iv) 1.5 0.26 13.3 13.7
v) 2.5 0.26 7.98 8.21
vi) 4 0.31 4.95 5.09
vii) 6 0.31 3.30 3.39
viii) 10 0.41 1.91 1.95
ix) 16 0.41 1.21 1.24
x) 25 0.41 0.780 0.795
xi) 35 0.41 0.554 0.565
xii) 50 0.41 0.386 0.393
xiii) 70 0.51 0.272 0.277
xiv) 95 0.51 0.206 0.210
xv) 120 0.51 0.161 0.164
xvi) 150 0.51 0.129 0.132
xvii) 185 0.51 0.106 0.108
xviii) 240 0.51 0.080 1 0.081 7
xix) 300 0.51 0.064 1 0.065 4
xx) 400 0.51 0.048 6 0.049 5
xxi) 500 0.61 0.038 4 0.039 1
xxii) 630 0.61 0.028 7 0.029 2

Table 4 Flexible Copper Conductors for Single Core and Multicore Cables (Class 6)
(Clauses 6.4.3 and 7.3.1)
Sl No. Nominal Cross- Maximum Diameter of Maximum Resistance of Conductor at 20°C
Sectional Area Wires in Conductor
Plain Wires Tinned Wires
mm2 mm Ω/km Ω/km
(1) (2) (3) (4) (5)
i) 0.5 0.16 39.0 40.1
ii) 0.75 0.16 26.0 26.7
iii) 1 0.16 19.5 20.0
iv) 1.5 0.16 13.3 13.7
v) 2.5 0.16 7.98 8.21
vi) 4 0.16 4.95 5.09
vii) 6 0.21 3.30 3.39
viii) 10 0.21 1.91 1.95
ix) 16 0.21 1.21 1.24
x) 25 0.21 0.780 0.795
xi) 35 0.21 0.554 0.565
xii) 50 0.31 0.386 0.393
xiii) 70 0.31 0.272 0.277
xiv) 95 0.31 0.206 0.210
xv) 120 0.31 0.161 0.164
xvi) 150 0.31 0.129 0.132
xvii) 185 0.41 0.106 0.108
xviii) 240 0.41 0.080 1 0.081 7
xix) 300 0.41 0.064 1 0.065 4

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IS 8130 : 2013

Table 5 Flexible Aluminium Conductors for Welding Cables

(Clauses 6.5.3 and 7.3.1)
Sl No. Nominal Cross-Sectional Maximum Diameter of Wires Maximum Resistance of
Area in Conductor Conductor at 20°C
mm2 mm Ω/km
(1) (2) (3) (4)
i) 25 0.31 1.23
ii) 35 0.31 0.901
iii) 50 0.31 0.634
iv) 70 0.31 0.445
v) 95 0.31 0.334
vi) 120 0.31 0.256

Table 6 Temperature Correction Factors kt for Conductor Resistance to Correct the

Measured Resistance at t °C to 20°C
( Clause 7.3)
Temperature of Conductor Correction Factor Temperature of Conductor Correction Factor
at time of Measurement at Time of Measurement
t °C kt t °C kt
(1) (2) (1) (2)
5 1.064 28 0.969
6 1.059 29 0.965
7 1.055 30 0.962
8 1.050 31 0.958
9 1.046 32 0.954
10 1.042 33 0.951
11 1.037 34 0.947
12 1.033 35 0.943
13 1.029 36 0.940
14 1.025 37 0.936
15 1.020 38 0.933
16 1.016 39 0.929
17 1.012 40 0.926
18 1.008 41 0.923
19 1.004 42 0.919
20 1.000 43 0.916
21 0.996 44 0.912
22 0.992 45 0.909
23 0.988 46 0.906
24 0.984 47 0.903
25 0.980 48 0.899
26 0.977 49 0.896
27 0.973 50 0.893
kt is based on resistance temperature co-efficient of 0.004 per °C at 20°C using following formula :

1 250
kt = =
1 + 0.004 (t - 20) 230 + t

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should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of
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This Indian Standard has been developed from Doc No.: ETD 09 (6339).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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