इंटरनेट
मानक
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
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“प0रा1 को छोड न' 5 तरफ”
“The Right to Information, The Right to Live”
“Step Out From the Old to the New”
Mazdoor Kisan Shakti Sangathan
Jawaharlal Nehru
IS 2532 (1965): Hard-drawn copper wire for telegraph and
telephone purposes [ETD 37: Conductors and Accessories for
Overhead Lines]
“!ान $ एक न' भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”
है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
IS : 2532 - 1965
Indian Standard
SPECIFICATION FOR
HARD-DRAWN COPPER WIRE FOR
TELEGRAPH AND TELEPHONE PURPOSES
Second Reprint JULY 1983
( Incorporating Amendments No. 1 and 2 )
UDC 621.315.55 : 669.3-426
© Copyright 1975
INDIAN
MANAK
Gr 3
STANDARDS
BHAVAN,
INSTITUTION
9 BAHADUR SHAH
NEW DELHI 110002
ZAFAR
MARG
August 1965
IS : 2532 - 1965
Indian Standard
SPECIFICATION FOR
HARD-DRAWN COPPER WIRE FOR
TELEGRAPH AND TELEPHONE PURPOSES
Conductors and Cables Sectional Committee, ETDC 32
Chairman
SHRI V. VENUGOPALAN
Members
SHRI L. C. BANSAL
Representing
Central Water & Power
Wing)
Commission (Power
Electrical Manufacturing Co Ltd, Calcutta
SHRI R K. SENGUPTA ( Alternate )
SHRI P. K. BHARUCHA
Insurance Association of India, Bombay
SHRI A. C. MODY ( Alternate )
SHRI M. R. BHAT
SHRI R. BOWYER
SHRI N. P. GHOSH
Bombay Suburban Electric Supply Ltd, Bombay
Indian Cable Co Ltd, Calcutta
Inspectorate of Mines ( Ministry of Labour &
Employment )
SHRI H. K. BHATTACHARJEE ( Alternate )
SHRI D. T. GURSAHANI
Directorate General of
( Inspection Wing )
Supplies &
Disposals
SHRI P. L. KAPUR ( Alternate )
SHRI S. K. KANJILAL
Railway Board ( Ministry of Railways )
SHRI N. PADMANABHAN ( Alternate )
SHRI H. S. KULKARNI
SHRI D. M. LAM
Federation of Electricity Undertakings of India
Ltd, Bombay
Directorate General of Posts & Telegraphs
( Ministry of Transport & Communications )
SHRI T. K. SUBRAMANIAN ( Alternate )
SHRI M. R. LODH
Devidayal Cable Industries Ltd, Bombay
SHRI KAMAL AGGARWAL ( Alternate )
WG CDR D. J. LAWYER
Directorate of Technical Development & Production ( Air ) ( Ministry of Defence )
SQN LDR S. B. PURANIK ( Alternate )
SHRI J. LYON
Fort Gloster Industries Ltd, Calcutta
SHRI G. P. SAXENA ( Alternate )
SHRI A. J MEHTA
Gujarat Electricity Board, Baroda
SHRI J. H. PATEL ( Alternate )
COL M. L. MIDHA
Controller General of Inspection & Planning
( Ministry of Defence )
SHRI S. K. MANI ( Alternate )
( Continued on page 2 )
INDIAN STANDARDS INSTITUTION
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
IS : 2532 - 1965
( Continued from page 1 )
Members
Representing
SHRI P. S. SRINIVASA M O D A L I A R
Radio
&
Electricals
Manufacturing
Co
Ltd,
Bangalore
SHRI V. R . CHANDER ( Alternate )
SHRI S. N. M U K E R J I
National Test House, Calcutta
SHRI B. K. M U K H E R J E E ( Alternate )
SHRI V. G. G. NAYAR
Aluminium Industries Ltd, Kundara
SHRI S. P E E R M O H A M M E D ( Alternate )
SHRI S. R. C. POTI
Asian Cables Corporation L t d , Bombay
SHRI A. K. R A M A N ( Alternate )
SHRI A. M.
SHRI K
RAMALINGAM
Madras State Electricity Board, Madras
A. SUBBAMANIAM ( Alternate )
SHRI K. N. RAMASWAMY
SHRI M. J. R A O
Directorate General of Technical Development
( Heavy Electricals Directorate ) ( Ministry of
Industry )
Tata Hydro-Electric Supply Co Ltd, Bombay
SHRI M . V . G O N D H A L E K A R ( Alternate )
SHRI T. S. R A O
In personal capacity ( 'Bhavani', No. 23, Block III,
Jayanagar, Bangalore )
Electrical Inspector to the Government of West
Bengal, Calcutta
Hindustan Cables Ltd, Rupnarainpur
REPRESENTATIVE
SHRI S. K. R O Y
SHRI K P . PILLAY ( Alternate )
SHRI D. P. SAHAI
National Insulated
Calcutta
Cable
Co
of
India
SHRI B. H. R A I ( Alternate )
SHRI S. M. SAHAI
S H R I L. R. SUBRAMANYAM
Alcan Asia Ltd, Calcutta
Henley Cables ( India ) Ltd, Bombay
S H R I K. V . R A M A R A O ( Alternate )
SUPERINTENDING
SURVEYOR
OF Central Public Works Department
W O R K S ( ELECTRICAL )
SHRI G. H. SWATEK
Cable Corporation of India Ltd, Bombay
DR P. S. S H A H ( Alternate )
C A P T B. Y. W A D
Naval
Headquarters
CDR P. S. M E H T A ( Alternate )
S H R I Y. S. VENKATESWARAN,
Deputy Director ( Electrotechnical ) ( Secretary )
Director, ISI ( Ex-officio Member )
2
Ltd,
IS : 2532 - 1965
Indian Standard
SPECIFICATION FOR
HARD-DRAWN COPPER WIRE FOR
TELEGRAPH AND TELEPHONE PURPOSES
0.
FOREWORD
0.1 This Indian Standard was adopted by the Indian Standards Institution
on 28 April 1965, after the draft finalized by the Conductors and Cables
Sectional Committee had been approved by the Electrotechnical Division
Council.
0.2 This standard has been formulated at the instance of Indian Posts
and Telegraphs Department to cover suitable hard-drawn copper wire
having the requisite electrical and physical properties for telegraph and
telephone purposes.
0.3 These hard-drawn copper wires are covered by Telegraph Wires (Unlawful Possession) Act, No. LXXIV of 1950 with all amendments.
0.4 In preparing this standard, assistance has been derived from
B. S. 174 : 1951 'Hard-drawn copper wire for telegraph and telephone
purposes' and B. S. 125 : 1954 'Hard-drawn copper conductors for
overhead power transmission purposes' issued by the British Standards
Institution.
0.5 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated, expressing
the result of a test, shall be rounded off in accordance with IS : 2-1960*.
The number of significant places retained in the rounded off value should
be the same as that of the specified value in this standard.
1. SCOPE
1.1 This specification covers the requirements for hard-drawn solid circular copper conductors for telegraph and telephone purposes.
*Rules for rounding off numerical values ( revised ).
3
IS : 2532 - 1965
2. TERMINOLOGY
2.0 For the purpose of this specification, the definitions given in IS : 15911960* and the following shall apply.
2.1 Piece — A length of wire without joint or splice of any description in
the finished wire.
2.2 Coil — One piece of wire in the form of a coil.
2.3 Bundle — Two or more coils properly bound together.
2.4 Lot — In any consignment all the pieces of the same diameter and
manufactured under uniform conditions of production at the same place
shall be grouped together to constitute a lot.
2.5 Diameter — The mean of two measurements at right angles taken at
the same cross-section.
3. CONDUCTOR
3.1 Material — The conductor shall consist of hard-drawn, high-conductivity round copper wires having the electrical and mechanical properties
specified in this standard. The physical constants of the material of the
wire shall conform to IS : 282-1963†.
4. STANDARD SIZES, RESISTANCES AND WEIGHTS OF WIRES
4.1 After drawing, the wires shall have the diameter, resistances and
weights specified in Table 1.
TABLE 1 HARD-DRAWN COPPER WIRES FOR TELEGRAPH AND
TELEPHONE PURPOSES
( Clauses 4.1, 6.1, 9.2.1, 9.3.1.1 and 10.1 )
DIAMETER
Stand- Maximum
ard
(1)
mm
2.50
2.80
3.45
(2)
mm
2.53
2.33
3 48
Minimum
(3)
mm
2.47
2.77
3.42
CALCULATED
AREA ON
STANDARD DIAMETER
(4)
mm2
4.909
6.158
9.348
RESISTANCE
AT 20°C
PER km
ard
Maximum
(5)
ohm
3.615
2.879
1.896
(6)
ohm
3.651
2.908
1.915
Stand-
STANDMINIMUM M I N I - M I N I ARD
BREAKING MUM
MUM
T E N - NUMBER WEIGLOAD
CALCUSILE
OF
HT
LATED AS STRE- TWISTS
PER
STANDNGTH
km
ARD DIAMETER
(7)
kg
230
280
420
(8)
kg/mm2
46.85
45.47
44.93
(9)
25
20
30
(10)
kg
43.6
54.7
83.1
*Glossary of terms for electrical cables and conductors.
†Specification for hard-drawn copper conductors for overhead power transmission
( revised ).
IS : 2532 - 1965
5. FREEDOM FROM DEFECTS
5.1 The wire shall be approximately circular in section and shall be clean,
smooth and free from harmful effects, such as spills, splits, etc, but superficial
tarnishing shall not be the cause for rejection.
5.2 Each piece shall be guaranteed to contain no weld, joint or splice
whatever, other than in the rod before it is drawn.
6. TOLERANCES
6.1 The permitted tolerance on the diameter of the wire shall conform to
the requirements given in Table 1.
7. WRAPPING AND MARKING OF COILS
7.1 Each piece of wire shall be coiled carefully and made up into a separate
coil such that its inner diameter is not less than 53 cm and not more than
56 cm. The weight of each coil shall be between 34 and 64 kg.
7.2 Each coil shall be bound securely with four separate binders, each of
two wrappings of annealed copper wire. In no case shall two or more coils
be linked or otherwise joined together.
7.3 Marking — Each coil shall have an eyeletted label of non-corrosive
metal sheet, with linen inside, securely attached to the inner part by means
of soft copper wire. The label shall furnish the following information:
a)
a)
c)
d)
7.3.1
Maker's name,
Year of manufacture,
Coil number, and
Weight of coil in kg.
The coils may also be marked with the ISI Certification Mark.
NOTE — The use of the ISI Certification Mark is governed by the provisions of the
Indian Standards Institution ( Certification Marks ) Act and the Rules and Regulations
made thereunder. The ISI Mark on products covered by an Indian Standard conveys
the assurance that they have been produced to comply with the requirements of that
standard under a well-defined system of inspection, testing; and quality control which
is devised and supervised by ISI and operated by the producer. ISI marked products
are also continuously checked by ISI for conformity to that standard as a further
safeguard. Details of conditions under which a licence for the use of the ISI Certification Mark may be granted to manufacturers or processors, may be obtained from the
Indian Standards Institution.
7.3.2 Each coil labelled as above, shall be wrapped in and completely
covered with two thicknesses of gunny (or any other approved material)
5
IS : 2532 - 1965
outside of which a duplicate label shall be attached before being packed
for despatch.
8. SAMPLING AND CRITERIA FOR CONFORMITY
8.1 The number of pieces to be examined from each lot for freedom from
defects (see 5) and for tolerance on sizes (see 6) and the corresponding
criteria for conformity shall be as agreed to between the supplier and the
purchaser.
8.2 From each lot, the number of coils as specified in Table 2 shall be
selected at random. From each of the coils so selected, one test piece of
the required or specified length for Wrapping test (see 9.1), tensile test
(see 9.2) torsion test (see 9.3) and resistance test (see 10), shall be cut
from the ends and subjected to those tests. The test pieces may also be
cut from any part of the coil other than ends in one of the selected coils;
the cut lengths of the coil shall not be welded or otherwise jointed
together. Each cut length shall be wound up into a separate coil and
accepted or rejected as mutually agreed upon at the time of placing the
order.
The length of sample selected for the electrical resistance test shall
be sufficient to give the accuracy required and shall be suitable for the
method of testing employed.
8.3 The lot shall be considered as conforming to the requirements of the
tensile strength and electrical resistance as laid down in this standard if the
mean and the range calculated from the test results for each characteristic
satisfy the conditions given below:
a) ( Mean + 0.6 Range ) shall be less than or equal to the corresponding maximum specified limit.
b) ( Mean — 0.6 Range ) shall be greater than or equal to the corresponding minimum specified limit.
NOTE 1 — Range it the difference between the maximum and the minimum
values of the test results.
NOTE 2 — This ensures that lots containing 0.5 percent or less defective coils
will be accepted most of the time.
8.4 The lot shall be considered as conforming to the requirements of the
wrapping test and torsion test if the number of failures is less than or equal
to the permissible number given in col 3 of Table 2.
9. MECHANICAL TESTS
9.1 Wrapping Test
9.1.1 The wire shall not break when tested by wrapping round a wire
of its own diameter to form a close helix of eight turns and unwrapping
6
IS : 2532 - 1965
six turns and closely rewrapping in the same direction as the first
wrapping.
TABLE 2
SAMPLING PLAN
( Clauses 8.2 and 8.4 )
NUMBER OF COILS
I N THE LOT
NUMBER OF COILS
TO BE SELECTED
PERMISSIBLE
NUMBER OF
FAILURES
(1)
(2)
3
(3)
0
0
0
0
Up
26
to
„
25
65
66
„ 180
181
„ 300
4
5
7
N O T E — This ensures that lots containing only 2.5 percent or less defective
material would be accepted most of the time.
9.2 Tensile Test
9.2.1 The breaking load of the wire, when tested as follows and
corrected standard diameter, shall not be less than the value given in
Table 1.
9.2.2 A tensile testing
easily be checked and
samples being placed in
in such a way as to
properties.
machine shall be used, the accuracy of which can
the machine adjusted, if necessary. The test
the machine shall be straightened, if necessary,
cause the minimum alteration in its physical
9.2.2.1 When an automatic tensile testing machine is used, the load
shall be applied gradually and the rate of separation of the jaws of the
testing machine shall not be greater than 10 cm per minute and shall be
so adjusted that the total time of testing from the moment of application of
the load till fracture is between 15 to 60 seconds.
9.2.2.2 When a hand-operated lever testing machine is used, 90 percent of the breaking load shall be applied quickly and the load shall then
be increased steadily until the specimen breaks. The time taken to apply
the remaining 10 percent of the load shall be approximately 15 seconds
and the total time from the application of the load to the break shall be
approximately 20 seconds.
9.3 Torsion Test
9.3.1 The wire shall not break when tested in the following manner,
The length of sample for 3.45 mm diameter wire shall be 150 mm and for
the others 75 mm.
7
IS : 2532 - 1965
9.3.1.1 The sample shall be gripped in two vices one of which
should be free to move in the direction of the axis of the wire whilst the
other shall be arranged to rotate upon the axis of the wire. The latter vice
shall be made to rotate at a speed not exceeding one revolution per second
for the minimum number of twists given in Table 1.
10. RESISTANCE TEST
10.1 The electrical resistance per kilometre of the test sample multiplied
by
(C) shall not exceed the value given in Table 1.
where
W = weight of test sample in kg/km,
K = standard weight in kg/km, and
C = multiplier constant for correcting to 20°C ( see Table 3 ).
TABLE 3 MULTIPLIER CONSTANTS FOR CONVERSION OF ELECTRICAL
RESISTANCE TO 20°C
Factors for converting resistances at various temperatures, of hard-drawn highconductivity copper of 97 percent conductivity, to the standard reference temperature
of 20°C, and reciprocals of the factors, for converting resistances at 20°C to other
temperatures.
TEMPERATURE °C
(1)
5
5.5
6
65
7
75
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
MULTIPLIER
CONSTANT
(2)
1.060 6
1.058 5
1.056 3
1.054 2
1.052 1
1.050 0
1.047 9
1.045 8
1.043 7
1.041 7
1.039 6
1.037 6
1.035 5
1.033 5
1.031 4
1.029 4
TEMPERATURE °C
RECIPROCAL OF
CONSTANT
(3)
0.942 9
0.944 8
0.946 7
0.948 6
0.950 5
0.952 4
0.954 3
0.956 2
0.958 1
0.960 0
0.961 9
0.963 8
0.965 7
0.967 6
0.969 5
0.971 4
(1)
13
13.5
14
14.5
15
15.5
16
16.5
17
17 5
18
18.5
19
19.5
20
20.5
MULTIPLIER
CONSTANT
RECIPROCAL OF
CONSTANT
(2)
1.027 4
1.025 4
1.023 4
1.021 4
1.019 4
1.017 4
1.015 5
1.013 5
1.011 6
1.009 6
1.007 7
1.005 7
1.003 8
1.001 9
1.000 0
0.998 1
(3)
0.973 3
0.975 2
0.977 1
0.979 0
0.981 0
0.982 9
0.984 8
0.986 7
0.988 6
0.990 5
0.992 4
0.994 3
0.996 2
0.998 1
1.000 0
1.001 9
( Continued )
8
lS : 2532 - 1965
TABLE 3 MULTIPLIER CONSTANTS FOR CONVERSION OF ELECTRICAL
RESISTANCE TO 20°C – Contd
TEMPERATURE °C
(1)
21
21.5
22
22.5
23
23.5
24
24.5
25
25.5
26
26.5
27
27.5
28
MULTIPLIER
CONSTANT
(2)
0.996 2
0.994 3
0.992 4
0.990 6
0.988 7
0.986 8
0.985 0
0.983 1
0.981 3
0.979 5
0.977 7
0.975 8
0.974 0
0.972 2
0.970 4
RECIPROCAL OF
CONSTANT
TEMPERATURE °C
(3)
1.003 8
1.005 7
1.007 6
1.009 5
1.011 4
1.013 3
1.015 2
1.017 1
1.019 1
1.021 0
1.022 9
1.024 8
1.026 7
1.028 6
1.030 5
(1)
28 5
29
29.5
30
35
40
45
50
55
60
65
70
75
80
85
MULTIPLIER
CONSTANT
(2)
0.968 6
0.966 8
0.965 1
0.963 3
0.945 9
0.929 2
0.913 0
0.897 4
0.882 3
0.867 8
0.853 6
0.840 0
0.826 8
0.813 9
0.801 5
RECIPROCAL OF
CONSTANT
(3)
1.032 4
1.034 3
1.036 2
1.038 1
1.057 1
1.076 2
1.095 2
1.114 3
1.133 3
1.152 4
1.171 4
1.190 5
1.209 5
1.228 6
1.247 8
NOTE — The temperature coefficient of resistance of copper varies slightly from
sample to sample according to its exact conductivity. The figures given in Table 3
are based on a value of the temperatures coefficient of resistance of 0.003 81 per
degree Celsius at 20°C, which is an average value for copper of 97 percent
conductivity.
The primary purpose of this table is to enable a resistance measured at a
temperature other than 20°C to be converted to the resistance at 20°C in order to
determine whether the conductor under test complies with the requirements of the
standard. For this purpose, the factors have been given at half-degree intervals
from 5 to 30°C, and the error in using the table between these limits for copper
within the range of conductivity, 96 to 98 percent will not exceed 0.06 percent.
The factors and their reciprocals have also been found of value for other
purposes, such as the calculation of voltage drop on heated conductors. For these
purposes only, values have been given at five-degree intervals from 30 to 85°C. It
should be realized, however, that their use may lead to errors of up to 0.2 percent
at the upper end of the range.
9
Base Units
QUANTITY
Length
Mass
Time
Electric current
Thermodynamic
temperature
Luminous intensity
Amount of substance
UNIT
SYMBOL
metre
kilogram
second
ampere
kelvin
m
kg
candela
mole
cd
mol
UNIT
SYMBOL
radian
steradian
rad
sr
s
A
K
Supplementary Units
QUANTITY
Plane angle
Solid angle
Derived Units
QUANTITY
Force
Energy
Power
Flux
Flux density
Frequency
Electric conductance
Electromotive force
Pressure, stress
DEFINITION
SYMBOL
UNIT
N
J
W
Wb
T
Hz
S
V
Pa
newton
joule
watt
webes
tesla
hertz
siemens
volt
pascal
N = 1 kg.m/g 2
J = 1 N.m
W = l J/s
Wb = 1 V.s
1 T = 1 Wb/m 3
1 Hz = 1 c/s (s - 1 )
1 3 = 1 A/V
1 V = 1 W/A
1 Pa = 1 N/m2
1
1
1
1
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