ASTM B835-14(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B835 −14 (Reapproved 2020)
Standard Specification for
Compact Round Stranded Copper Conductors Using Single
Input Wire Construction
This standard is issued under the fixed designation B835; 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 bare compact round stranded
B354 Terminology Relating to Uninsulated Metallic Electri-
conductors made from uncoated copper wires of a single input
cal Conductors
wire (SIW) diameter for general use in covered or insulated
2.3 NIST Document:
electrical wires or cables. These conductors shall be con-
NBS Handbook 100 Copper Wire Tables
structed with one or more layers of helically laid compacted
wires (Explanatory Note 1, Note 2, and Note 3).
3. Classification
1.2 The values stated in inch-pound units are to be regarded
3.1 The conductors described in this specification are in-
as standard. The values given in parentheses are mathematical
tendedforsubsequentinsulationorcovering.Theclassification
conversions to SI units that are provided for information only
of these conductors is SIW compact.
and are not considered standard.
1.2.1 For density, resistivity and temperature, the values
4. Ordering Information
stated in SI units are to be regarded as standard.
4.1 Orders for material in accordance with this specification
1.3 This standard does not purport to address all of the
shall include the following information:
safety concerns, if any, associated with its use. It is the
4.1.1 Quantity of each size (Table 1);
responsibility of the user of this standard to establish appro-
4.1.2 Conductorsize,circular-milarea,orAWG(Section8);
priate safety, health, and environmental practices and deter-
4.1.3 Packaging (Section 16), if required;
mine the applicability of regulatory limitations prior to use.
4.1.4 Special package marking; and
1.4 This international standard was developed in accor-
4.1.5 Place of inspection (Section 15).
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Requirements for Wires
Development of International Standards, Guides and Recom-
5.1 Before stranding and compacting, the copper wire shall
mendations issued by the World Trade Organization Technical
meet all of the requirements of Specification B3.
Barriers to Trade (TBT) Committee.
6. Joints
2. Referenced Documents
6.1 Welds and brazes may be made in rods or in wires prior
2.1 The following documents of the issue in effect on date
to final drawing.
of material purchase form a part of this specification to the
6.2 Welds and brazes may be made in the individual wires
extent referenced herein.
for compact conductors, but they shall not be closer together
2.2 ASTM Standards:
than1ft(0.3m)forconductorof19wiresorlessorcloserthan
B3 Specification for Soft or Annealed Copper Wire
1 ft (0.3 m) in a layer for conductor of more than 19 wires.
6.3 No joint or splice shall be made in a compact-stranded
conductor as a whole.
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
7. Lay
Conductors of Copper and Copper Alloys.
Current edition approved Jan. 1, 2020. Published January 2020. Originally
7.1 The length of lay shall not be less than 8 or more than
approved in 1993. Last previous edition approved in 2014 as B835 – 14. DOI:
16 times the outside diameter of the completed conductor.
10.1520/B0835-14R20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from National Institute of Standards and Technology (NIST), 100
the ASTM website. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
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B835 − 14 (2020)
TABLE 1 Construction Requirements of Compact Round SIW-Stranded Copper Conductors
Conductor Size Compact Conductor Diameter dc Resistance at 20°C
Minimum Mass/1000 ft, Mass/km,
Number of Wires lb/1000 ft kg/km
Circular, mils AWG mm in. mm Ω/1000 ft Ω/km
1 000 000 . 507 53 1.060 26.9 3086 4590 0.0106 0.0347
900 000 . 456 53 0.999 25.4 2780 4140 0.0118 0.0386
800 000 . 405 53 0.938 23.8 2469 3680 0.0132 0.0433
750 000 . 380 53 0.908 23.0 2316 3450 0.0141 0.0462
700 000 . 355 34 0.877 22.3 2160 3220 0.0151 0.0495
650 000 . 329 34 0.845 21.4 2006 2990 0.0163 0.0535
600 000 . 304 34 0.813 20.6 1850 2760 0.0176 0.0577
550 000 . 279 34 0.775 19.7 1700 2530 0.0192 0.0630
500 000 . 253 30 0.736 18.7 1542 2300 0.0212 0.0695
450 000 . 228 30 0.700 17.8 1390 2070 0.0235 0.0770
400 000 . 203 24 0.659 16.7 1236 1840 0.0264 0.0865
350 000 . 177 24 0.616 15.7 1080 1610 0.0302 0.0990
300 000 . 152 18 0.570 14.5 925 1380 0.0353 0.116
250 000 . 127 18 0.520 13.2 772 1150 0.0423 0.139
211 600 4/0 107 17 0.475 12.1 653 972 0.0500 0.164
167 800 3/0 85.0 15 0.423 10.8 518 771 0.0630 0.206
133 100 2/0 67.4 12 0.376 9.57 411 611 0.0795 0.261
105 600 1/0 53.5 7 0.336 8.55 326 485 0.100 0.328
83 690 1 42.4 7 0.299 7.60 259 385 0.126 0.413
66 350 2 33.6 6 0.268 6.81 205 305 0.159 0.521
41 740 4 21.2 6 0.213 5.41 129 192 0.253 0.830
26 240 6 13.3 6 0.169 4.29 80.9 121 0.403 1.32
16 510 8 8.37 6 0.134 3.40 51.0 75.9 0.641 2.10
TABLE 2 Temperature Correction Factors for Conductor
Resistance
7.2 The direction of lay of the outer layer shall be left-hand,
Multiplying Factor for Correction to
Temperature,°C
and it may be reversed or unidirectional in successive layers.
20°C
0 1.085
7.3 Other lay requirements may be furnished upon special
5 1.063
agreement between the manufacturer and the purchaser.
10 1.041
15 1.020
8. Construction 20 1.000
25 0.981
8.1 The construction of the compact round SIW stranded
30 0.962
35 0.944
conductors shall be as given in Table 1.
40 0.927
8.2 Wires used in the fabrication of the compact round 45 0.911
50 0.895
conductor shall be of such dimensions as to produce a finished
55 0.879
conductor as prescribed in Table 1.
60 0.864
65 0.850
70 0.836
9. Density
75 0.822
9.1 For the purpose of calculating mass per unit length, 80 0.809
85 0.797
cross sections, and so forth, the density of the copper shall
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