ASTM B902-00
(Specification)Standard Specification for Compressed Round Stranded Copper Conductors, Hard, Medium-Hard, or Soft Using Single Input Wire Construction
Standard Specification for Compressed Round Stranded Copper Conductors, Hard, Medium-Hard, or Soft Using Single Input Wire Construction
SCOPE
1.1 This specification covers stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use in insulated conductor assemblies for electrical purposes. These conductors shall be composed of one or more roller shaped or die closed layers of helically laid wires using the single input wire (SIW) methodology. (see Note 0 and Explanatory Note 0)Note 0
Sealed conductors which are intended to prevent longitudinal water propagation and are further covered/insulated, are also permitted within the guidelines of this specification.
1.2 The values stated in inch-pound or SI units are to be regarded separately as standard. The values in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.2.1 For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.
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Designation: B 902 – 00
Standard Specification for
Compressed Round Stranded Copper Conductors, Hard,
Medium-Hard, or Soft Using Single Input Wire Construction
This standard is issued under the fixed designation B 902; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope B 354 Terminology Relating to Uninsulated Metallic Elec-
trical Conductors
1.1 This specification covers stranded conductors made
2.2 Other Standard:
from round copper wires, either uncoated or coated with tin,
NBS Handbook 100— Copper Wire Tables
lead, or lead alloy for general use in insulated conductor
assemblies for electrical purposes. These conductors shall be
3. Classification
composed of one or more roller shaped or die closed layers of
3.1 The conductors described in this specification are in-
helically laid wires using the single input wire (SIW) method-
tended for subsequent insulation or covering. The classification
ology. (see Note 1 and Explanatory Note 1)
of these conductors is SIW compressed.
NOTE 1—Sealed conductors which are intended to prevent longitudinal
water propagation and are further covered/insulated, are also permitted
4. Ordering Information
within the guidelines of this specification.
4.1 Orders for material under this specification shall include
1.2 The values stated in inch-pound or SI units are to be
the following information:
regarded separately as standard. The values in each system are
4.1.1 Quantity of each size,
not exact equivalents; therefore, each system shall be used
4.1.2 Conductor size: circular-mil area or AWG (see Section
independently of the other. Combining values from the two
7),
systems may result in nonconformance with the specification.
4.1.3 Class: SIW compressed (see 1.2 and Table 1),
1.2.1 For density, resistivity, and temperature, the values
4.1.4 Temper (see 5.3),
stated in SI units are to be regarded as standard.
4.1.5 Whether coated or uncoated; if coated (see 5.1 and
5.2).
2. Referenced Documents
4.1.6 Details of special-purpose lays, if required (see 7.3).
2.1 ASTM Standards:
4.1.7 When physical tests shall be made (see 10.2 and 10.3).
B 1 Specification of Hard-Drawn Copper Wire
4.1.8 Package size (see 16.1).
B 2 Specification for Medium-Hard-Drawn Copper Wire
4.1.9 Lagging, if required (see 16.2).
B 3 Specification for Soft or Annealed Copper Wire
4.1.10 Special package marking, if required (see Section
B 33 Specification for Tinned Soft or Annealed Copper
16.3), and
Wire for Electrical Purposes
4.1.11 Place of inspection (see Section 15).
B 189 Specification for Lead-Coated and Lead-Alloy-
5. Requirements for Wires
Coated Soft Copper Wire for Electrical Purposes
B 193 Test Method for Resistivity of Electrical Conductor
5.1 The purchaser shall designate the type of wire and the
Materials
kind of coating, if any, to be used in the conductor.
B 246 Specification for Tinned Hard-Drawn and Medium-
5.2 Before stranding, the copper wire used shall meet all of
Hard-Drawn Copper Wire for Electrical Purposes
the requirements of the following specifications of ASTM that
B 263 Test Method for Determination of Cross-Sectional
are applicable to its type:
Area of Stranded Conductors
5.2.1 Specification B 3,
5.2.2 Specification B 33,
5.2.3 Specification B 2,
5.2.4 Specification B 1,
This specification is under the jurisdiction of ASTM Committee B-1 of
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
Conductors of Copper Alloys.
Current edition approved April 10, 2000. Published June 2000. Available from National Technical Information Service, 5285 Port Royal Road,
Annual Book of ASTM Standards, Vol 02.03. Springfield, VA 22161.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 902
TABLE 1 Construction Requirements of Compressed Round SIW Standard Copper Conductors
Compressed Strand Dimensions
Conductor Size Nominal Nominal
Diameter Diameter
of SIW of SIW
Minimum Compressed Compressed
Number of Conductor Conductor Mass DC Resistance at 20°C
cmils AWG mmˆ 2 Wires in. mm. lb/1000ft kg/km V/1000ft V/km
5 000 000 2534 217 2.424 61.57 15890 23649 0.00218 0.00715
4 500 000 2280 217 2.300 58.41 14300 21283 0.00242 0.00794
4 000 000 2027 217 2.168 55.07 12590 18738 0.00270 0.00886
3 500 000 1773 169 2.028 51.51 11020 16401 0.00308 0.01010
3 000 000 1520 169 1.878 47.69 9353 13920 0.00365 0.01197
2 500 000 1267 127 1.714 43.54 7794 11600 0.00428 0.01404
2 000 000 1013 127 1.533 38.94 6175 9190 0.00529 0.01735
1 900 000 962.7 127 1.494 37.95 5866 8730 0.00557 0.01827
1 800 000 912.1 127 1.454 36.93 5558 8272 0.00588 0.01929
1 750 000 886.7 127 1.434 36.42 5403 8041 0.00604 0.01981
1 700 000 861.4 127 1.413 35.89 5249 7812 0.00622 0.02040
1 600 000 810.7 127 1.371 34.82 4940 7352 0.00661 0.02168
1 500 000 760.1 90 1.327 33.71 4631 6892 0.00705 0.02312
1 400 000 709.4 90 1.282 32.56 4323 6434 0.00756 0.02480
1 300 000 658.7 90 1.236 31.39 4014 5974 0.00814 0.02670
1 250 000 633.4 90 1.212 30.78 3859 5743 0.00847 0.02778
1 200 000 608.0 90 1.187 30.15 3705 5514 0.00882 0.02893
1 100 000 557.4 90 1.137 28.88 3396 5054 0.00962 0.03155
1 000 000 506.7 53 1.084 27.53 3088 4596 0.0106 0.0348
900 000 456.0 53 1.028 26.11 2779 4136 0.0118 0.3087
800 000 405.4 53 0.969 24.61 2470 3676 0.0132 0.0433
750 000 380.0 53 0.939 23.85 2316 3447 0.0141 0.0462
700 000 354.7 34 0.907 23.04 2161 3216 0.0151 0.0495
650 000 329.4 34 0.874 22.20 2007 2987 0.0163 0.0535
600 000 304.0 34 0.840 21.34 1883 2802 0.0177 0.0581
550 000 278.7 34 0.804 20.42 1698 2527 0.0192 0.0630
500 000 253.4 30 0.766 19.46 1544 2298 0.0212 0.0695
450 000 228.0 30 0.727 18.47 1389 2067 0.0235 0.0771
400 000 202.7 24 0.685 17.40 1235 1838 0.0264 0.0866
350 000 177.3 24 0.641 16.28 1081 16.09 0.3002 0.0991
300 000 152.0 18 0.594 15.09 926.3 1379 0.0353 0.1158
250 000 126.7 18 0.542 13.77 771.9 1149 0.0423 0.1387
211 600 0000 107.2 17 0.498 12.65 653.1 972.0 0.0500 0.1640
167 800 000 85.03 15 0.443 11.25 518.1 771.1 0.0630 0.2066
133 100 00 67.44 12 0.395 10.03 410.9 611.5 0.0795 0.2607
105 600 0 53.51 7 0.352 8.94 325.8 484.9 0.100 0.328
83 690 1 42.41 7 0.313 7.95 258.4 384.6 0.127 0.417
66 360 2 33.63 6 0.283 7.19 204.9 305.0 0.159 0.521
52 620 3 26.66 6 0.252 6.40 162.5 241.8 0.201 0.659
41 740 4 21.15 6 0.225 5.72 128.9 191.8 0.253 0.830
33 090 5 16.77 6 0.200 5.08 102.2 152.1 0.319 1.046
26 240 6 13.30 6 0.178 4.52 81.05 120.6 0.403 1.322
20 820 7 10.55 6 0.159 4.04 64.28 95.67 0.509 1.669
16 510 8 8.366 6 0.142 3.61 50.97 75.86 0.640 2.099
13 090 9 6.633 6 0.126 3.20 40.42 60.16 0.809 2.653
10 380 10 5.260 6 0.113 2.87 32.06 47.71 1.02 3.35
6 530 12 3.309 6 0.089 2.26 20.16 30.00 1.63 5.35
4 110 14 2.083 6 0.071 1.80 12.68 18.87 2.58 8.46
2 580 16 1.307 6 0.054 1.37 7.974 11.87 4.10 13.45
1 620 18 0.8209 6 0.043 1.09 5.015 7.464 6.54 21.45
1 020 20 0.5168 6 0.034 0.86 3.154 4.694 10.3 33.8
640 22 0.3243 6 0.027 0.69 1.992 2.965 16.4 53.8
404 24 0.2047 6 0.022 0.56 1.249 1.859 26.1 85.6
5.2.5 Specification B 189, and individual wires composing the conductor, but shall not be
5.2.6 Specification B 246. closer together than prescribed in Table 2.
5.3 In SIW compressed conductors, the central core shall be
made of wire of the same type and temper as the concentric 7. Lay
layers, unless otherwise specified.
7.1 For stranded conductors, the lay length of a layer of
wires shall be not less than 8 nor more than 16 times the outer
6. Joints
diameter of the finished conductor. For conductors of 37 wires
6.1 Welds and brazes may be made in rods or in wires prior or more, this requirement shall apply to the wires in the outer
to final drawing. Welds and brazes may be made in the finished two layers only.
B 902
TABLE 2 Minimum Distance Between Joints in Completed
10. Physical and Electrical Tests of Conductors Stranded
Conductor
of Hard-Drawn or Medium-Hard-Drawn Wires
Number of Hard or Soft Temper
10.1 Tests for the physical and electrical properties of wires
Wires in Medium-Hard
Conductor Temper composing conductors made from hard-drawn or medium-
hard-drawn wires, uncoated or coated, shall be made before but
3to19 50ft 1 ft
A
20 to 36 50 ft 1 ft in a layer
not after stranding.
A
37 to 60 25 ft 1 ft in a layer
10.2 At the option of the purchaser, tension and elongation
A
61 and over 5 ft 1 ft in a layer
tests on hard-drawn and medium-hard-drawn wires, uncoated
A
Except as indicated, the limitations apply to closeness of joints throughout the
or coated, before stranding may be waived, and the completed
completed conductor.
hard-drawn and medium-hard-drawn conductors may be tested
as a unit. The breaking strength of the bare conductors so tested
7.2 For stranded conductors, the direction of lay of the outer
shall be at least 90 % of the total of the specified minimum
layer shall be left hand and may be reversed or unidirectional/
breaking strengths of the component wires. The maximum
unilay in successive layers, unless otherwise specified by the
breaking strength of conductors made from medium-hard-
purchaser.
drawn wires, uncoated or coated, shall be not greater than the
7.3 Other lays for special purposes shall be furnished by
sum of the specified maximum breaking strengths of the
special agreement between the manufacturer and the purchaser
component wires. The minimum breaking strength of wires
(Explanatory Note 3).
shall be calculated using specified nominal diameters and
specified minimum tensile strengths. The maximum breaking
8. Construction
strengths of wires shall be calculated using nominal diameters
8.1 The areas of cross section, minimum number of wires,
and specified maximum tensile strengths. The free length
and diameters of strands for SIW compressed stranded con-
between grips of the test specimen shall be not less than 24 in.
ductors shall conform to the requirements prescribed in Table
(600 mm), and care shall be taken to ensure that the wires in
1 (Explanatory Note 2).
the conductor are evenly gripped during the test (Explanatory
Note 4).
9. Physical and Electrical Tests of Conductors Stranded
10.3 When requested by the purchaser at the time of placing
of Soft Wires
the order, tension tests on hard-drawn and medium-hard-drawn
9.1 Tests for the electrical properties of wires composing
wires, uncoated or coated, before stranding or as a unit may be
conductors made from soft or annealed copper wire, bare or
waived and tests made on wires removed from the completed
coated, shall be made before stranding.
conductor. The test limits, based on a 10-in. (250-mm) gage
9.2 Tests fo
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