ASTM B902-04a(2010)

Standard Specification for Compressed Round Stranded Copper Conductors, Hard, Medium-Hard, or Soft Using Single Input Wire Construction

ABSTRACT
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. For stranded conductors, the direction of lay of the outer layer shall be leeft hand and may be reversed or unidirectional/unilay in successive layers. Test for the physical and electrical properties of wires composing conductors made from hard-drawn or medium-hard-drawn wires, uncoated or coated, shall be made before but not after stranding. For the purpose of calculating mass, cross sections, and so forth, the density of the copper shall be taken. The mass and electrical resistance of a unit length of stranded unsealed conductor are a function of the lenght of lay shall be calculated.
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 1 and Explanatory Note 1)
Note 1—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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2010
• ICS: 29.060.10 - Wires
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.04 - Conductors of Copper and Copper Alloys

Relations

• Replaces: ASTM B902-04a - Standard Specification for Compressed Round Stranded Copper Conductors, Hard, Medium-Hard, or Soft Using Single Input Wire Construction
• Effective Date: 01-Oct-2010
• Replaced By: ASTM B902-13 - Standard Specification for Compressed Round Stranded Copper Conductors, Hard, Medium-Hard, or Soft Using Single Input Wire Construction
• Effective Date: 01-Feb-2013
• Referred By: ASTM B226-11(2021) - Standard Specification for Cored, Annular, Concentric-Lay-Stranded Copper Conductors
• Effective Date: 01-Oct-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B902 −04a(Reapproved 2010)
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 B902; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope B263 Test Method for Determination of Cross-Sectional
Area of Stranded Conductors
1.1 This specification covers stranded conductors made
B354 Terminology Relating to Uninsulated Metallic Electri-
from round copper wires, either uncoated or coated with tin,
cal Conductors
lead, or lead alloy for general use in insulated conductor
2.2 Other Standard:
assemblies for electrical purposes. These conductors shall be
NBS Handbook 100: Copper Wire Tables
composed of one or more roller shaped or die closed layers of
helically laid wires using the single input wire (SIW) method-
3. Classification
ology. (see Note 1 and Explanatory Note 1)
3.1 The conductors described in this specification are in-
NOTE 1—Sealed conductors which are intended to prevent longitudinal
tendedforsubsequentinsulationorcovering.Theclassification
water propagation and are further covered/insulated, are also permitted
of these conductors is SIW compressed.
within the guidelines of this specification.
1.2 The values stated in inch-pound or SI units are to be
4. Ordering Information
regarded separately as standard. The values in each system are
4.1 Orders for material under this specification shall include
not exact equivalents; therefore, each system shall be used
the following information:
independently of the other. Combining values from the two
4.1.1 Quantity of each size,
systems may result in nonconformance with the specification.
4.1.2 Conductorsize:circular-milareaorAWG(seeSection
1.2.1 For density, resistivity, and temperature, the values
7),
stated in SI units are to be regarded as standard.
4.1.3 Class: SIW compressed (see 1.2 and Table 1),
4.1.4 Temper (see 5.3),
2. Referenced Documents
4.1.5 Whether coated or uncoated; if coated (see 5.1 and
2.1 ASTM Standards:
5.2).
B1 Specification for Hard-Drawn Copper Wire
4.1.6 Details of special-purpose lays, if required (see 7.3).
B2 Specification for Medium-Hard-Drawn Copper Wire
4.1.7 Whenphysicaltestsshallbemade(see10.2and10.3).
B3 Specification for Soft or Annealed Copper Wire
4.1.8 Package size (see 16.1).
B33 Specification for Tin-Coated Soft or Annealed Copper
4.1.9 Lagging, if required (see 16.2).
Wire for Electrical Purposes
4.1.10 Special package marking, if required (see Section
B189 Specification for Lead-Coated and Lead-Alloy-Coated
16.3), and
Soft Copper Wire for Electrical Purposes
4.1.11 Place of inspection (see Section 15).
B193 Test Method for Resistivity of Electrical Conductor
Materials 5. Requirements for Wires
B246 Specification for Tinned Hard-Drawn and Medium-
5.1 The purchaser shall designate the type of wire and the
Hard-Drawn Copper Wire for Electrical Purposes
kind of coating, if any, to be used in the conductor.
5.2 Before stranding, the copper wire used shall meet all of
1 the requirements of the following specifications ofASTM that
This specification is under the jurisdiction of ASTM Committee B01 of
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on are applicable to its type:
Conductors of Copper and Copper Alloys.
5.2.1 Specification B3,
Current edition approved Oct. 1, 2010. Published December 2010. Originally
5.2.2 Specification B33,
approved in 2000. Last previous edition approved in 2004 as B902 – 04a. DOI:
5.2.3 Specification B2,
10.1520/B0902-04AR10.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from NationalTechnical Information Service, 5285 Port Royal Road,
the ASTM website. Springfield, VA 22161.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B902−04a (2010)
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 mm Wires in. mm. lb/1000ft kg/km Ω/1000ft Ω/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
5.2.4 Specification B1, individual wires composing the conductor, but shall not be
5.2.5 Specification B189, and closer together than prescribed in Table 2.
5.2.6 Specification B246.
7. Lay
5.3 In SIWcompressed conductors, the central core shall be
made of wire of the same type and temper as the concentric
7.1 For stranded conductors, the lay length of a layer of
layers, unless otherwise specified.
wires shall be not less than 8 nor more than 16 times the outer
diameter of the finished conductor. For conductors of 37 wires
6. Joints
or more, this requirement shall apply to the wires in the outer
6.1 Welds and brazes may be made in rods or in wires prior
two layers only.
to final drawing.Welds and brazes may be made in the finished
B902−04a (2010)
TABLE 2 Minimum Distance Between Joints in Completed
9.6 Elongation tests to determine compliance shall not be
Conductor
made on the conductor as a unit.
Number of Hard or Soft Temper
9.7 If a tinning, lead-coating, or lead-alloy-coating test is
Wires in Medium-Hard
Conductor Temper
required, it shall be made on the wires prior to stranding.
3to19 50ft 1ft
A
20 to 36 50 ft 1 ft in a layer
10. Physical and Electrical Tests of Conductors Stranded
A
37 to 60 25 ft 1 ft in a layer
A of Hard-Drawn or Medium-Hard-Drawn Wires
61 and over 5 ft 1 ft in a layer
A
Except as indicated, the limitations apply to closeness of joints throughout the
10.1 Tests for the physical and electrical properties of wires
completed conductor.
composing conductors made from hard-drawn or medium-
hard-drawnwires,uncoatedorcoated,shallbemadebeforebut
not after stranding.
10.2 At the option of the purchaser, tension and elongation
7.2 Forstrandedconductors,thedirectionoflayoftheouter
tests on hard-drawn and medium-hard-drawn wires, uncoated
layer shall be left hand and may be reversed or unidirectional/
or coated, before stranding may be waived, and the completed
unilay in successive layers, unless otherwise specified by the
hard-drawn and medium-hard-drawn conductors may be tested
purchaser.
asaunit.Thebreakingstrengthofthebareconductorssotested
7.3 Other lays for special purposes shall be furnished by
shall be at least 90 % of the total of the specified minimum
special agreement between the manufacturer and the purchaser
breaking strengths of the component wires. The maximum
(Explanatory Note 3).
breaking strength of conductors made from medium-hard-
drawn wires, uncoated or coated, shall be not greater than the
8. Construction
sum of the specified maximum breaking strengths of the
component wires. The minimum breaking strength of wires
8.1 The areas of cross section, minimum number of wires,
shall be calculated using specified nominal diameters and
and diameters of strands for SIW compressed stranded con-
specified minimum tensile strengths. The maximum breaking
ductors shall conform to the requirements prescribed in Table
strengths of wires shall be calculated using nominal diameters
1 (Explanatory Note 2).
and specified maximum tensile strengths. The free length
9. Physical and Electrical Tests of Conductors Stranded between grips of the test specimen shall be not less than 24 in.
(600 mm), and care shall be taken to ensure that the wires in
of Soft Wires
the conductor are evenly gripped during the test (Explanatory
9.1 Tests for the electrical properties of wires composing
Note 4).
conductors made from sof
...