ASTM B286-20

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B286 − 07 (Reapproved 2017) B286 − 20
Standard Specification for
Copper Conductors for Use in Hookup Wire for Electronic
Equipment
This standard is issued under the fixed designation B286; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This specification covers uninsulated metallic-coated copper conductors for use in hookup wire for electronic equipment.
1.2 The SI values for density are to be regarded as standard. For all other properties, the inch-pound values are to be regarded as
the standard.
1.3 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.
2. Referenced Documents
2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extent
referenced herein:
2.2 ASTM Standards:
B33 Specification for Tin-Coated Soft or Annealed Copper Wire for Electrical Purposes
B189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes
B193 Test Method for Resistivity of Electrical Conductor Materials
B258 Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as
Electrical Conductors
B298 Specification for Silver-Coated Soft or Annealed Copper Wire
B355 Specification for Nickel-Coated Soft or Annealed Copper Wire
3. Ordering Information
3.1 Orders for material under this specification shall include the following information:
3.1.1 Quantity of each size, designation (Table 1) and type,
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on Conductors
of Copper and Copper Alloys.
Current edition approved May 15, 2017Nov. 1, 2020. Published May 2017November 2020. Originally approved in 1954. Last previous edition approved in 20122017 as
B286 – 07 (2012).(2017). DOI: 10.1520/B0286-07R17.10.1520/B0286-20.
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 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B286 − 20
TABLE 1 Details of Conductor Construction
Type I (Solid Conductors)
D-C Resistance at 20°C, Ω/1000 ft, max (Explanatory Note 2)
Size Nominal
Nominal
Annealed
Designation, Area,
Annealed Tin or Class 2 Class 10 Class 27
Diameter, in.
Silver
A
AWG cmils
Lead-Alloy Coated Nickel Nickel Nickel
Coated
10 10380 0.1019 1.06 1.02 1.05 1.17 1.44
12 6530 0.0808 1.69 1.62 1.68 1.84 2.28
14 4110 0.0641 2.68 2.58 2.67 2.93 3.63
16 2580 0.0508 4.26 4.10 4.27 4.65 5.77
18 1620 0.0403 6.78 6.52 6.79 7.39 9.17
20 1020 0.0320 10.7 10.3 10.8 11.8 14.6
22 640 0.0253 17.2 16.5 17.3 18.8 23.3
24 404 0.0201 27.2 26.2 27.3 29.8 36.9
26 253 0.0159 44.5 41.9 43.8 47.5 58.9
28 159 0.0126 70.8 66.8 69.4 75.4 107.0
30 100 0.0100 114.0 106.0 110.0 120.0 149.0
Type II (Stranded Conductors)
Conductor Construction D-C Resistance at 20°C, Ω/1000 ft, max (Explanatory Note 2)
Nominal Calculated Length of Lay, Annealed
Maximum Annealed 50 to 100
Size Number Diameter of Cross- in. Tin or Class 10 Class 27
Allowable Silver μin.
B C
Designation of Wires Each Wire, Sectional (Explanatory Lead-Alloy Nickel Nickel
D E
Diameter, in. Coated of Nickel
in. Area, cmils Note 3) Coated
F
0000–2109 2109 0.0100 210 900 0.635 . 0.0576 0.0537 0.0559(2) 0.0610 0.0756
F
000–1672 1672 0.0100 167 200 0.545 . 0.0727 0.0677 0.0705(2) 0.0770 0.0954
F
00–1330 1330 0.0100 133 000 0.486 . 0.0914 0.0851 0.0887(2) 0.0967 0.120
F
0–1064 1064 0.0100 106 400 0.435 . 0.114 0.106 0.111(2) 0.121 0.150
F
0–1045 1045 0.0100 104 500 0.431 . 0.116 0.108 0.113(2) 0.123 0.153
F
1–836 836 0.0100 83 600 0.386 . 0.145 0.135 0.141(2) 0.154 0.191
E F E
1–817 817 0.0100 81 700 0.382 . 0.149 0.139 0.144(2) 0.158 0.195
F
2–665 665 0.0100 66 500 0.342 . 0.183 0.170 0.177(2) 0.194 0.240
E F E
4–133 133 0.0179 42 615 0.274 . 0.280 0.263 0.274(2) 0.299 0.371
G
4–420 420 0.0100 42 000 0.275 . 0.289 0.270 0.281(2) 0.306 0.380
E F E
6–133 133 0.0142 26 818 0.217 . 0.444 0.418 0.436(2) 0.475 0.589
G
6–266 266 0.0100 26 600 0.220 . 0.457 0.426 0.443(2) 0.484 0.600
E F E
8–133 133 0.0113 16 983 0.173 . 0.701 0.661 0.688(2) 0.751 0.930
G
8–168 168 0.0100 16 800 0.177 . 0.724 0.674 0.702(2) 0.766 0.949
G
10–105 105 1.0100 10 500 0.130 1.2 to 1.8 1.15 1.07 1.11(2) 1.21 1.50
H
10–104 104 0.0100 10 400 0.130 1.7 to 2.1 1.16 1.08 1.12(2) 1.23 1.52
E G G
10–49 49 0.0142 9 880 0.132 . 1.21 1.14 1.18(2) 1.29 1.60
E E E
10–37 37 0.0159 9 354 0.115 1.10 to 1.75 1.26 1.19 1.24(2) 1.35 1.67
H
12–65 65 0.0100 6 500 0.099 1.3 to 1.7 1.85 1.73 1.80(2) 1.96 2.43
Type II (Stranded Conductors)
Conductor Construction D-C Resistance at 20°C, Ω/1000 ft, max (Explanatory Note 2)
Calculated Length of Lay, Annealed
Nominal Maximum Annealed
Size Number Cross- in. Tin or 50 to 100 μin. Class 10 Class 27
Diameter of Allowable Silver
B C I
Designation of Wires Sectional (Explanatory Lead-Alloy of Nickel Nickel Nickel
D
Each Wire, in. Diameter, in. Coated
Area, cmils Note 2) Coated
E E E
12–37 37 0.0126 5 874 0.091 0.90 to 1.45 2.01 1.89 1.97(2) 2.15 2.66
E J E
12–19 19 0.0179 6 088 0.093 0.90 to 1.45 1.92 1.81 1.88(2) 2.05 2.55
H
14–41 41 0.0100 4 100 0.081 0.80 to 1.35 2.94 2.74 2.85(2) 3.11 3.85
E J E
14–19 19 0.0142 3 831 0.073 0.80 to 1.15 3.05 2.87 2.99(2) 3.26 4.05
H
16–26 26 0.0100 2 600 0.062 0.60 to 0.90 4.59 4.27 4.45(2) 4.86 6.02
E J E
16–19 19 0.0113 2 426 0.059 0.60 to 0.90 4.82 4.54 4.73(2) 5.15 6.39
E H E
18–26 26 0.0080 1 664 0.050 0.50 to 0.70 7.20 6.71 7.14(4) 7.63 9.45
E J E
18–19 19 0.0100 1 900 0.052 0.50 to 0.70 6.22 5.79 6.03(2) 6.58 8.16

B286 − 20
TABLE 1 Continued
Type II (Stranded Conductors)
Conductor Construction D-C Resistance at 20°C, Ω/1000 ft, max (Explanatory Note 2)
Calculated Length of Lay, Annealed
Nominal Maximum Annealed
Size Number Cross- in. Tin or 50 to 100 μin. Class 10 Class 27
Diameter of Allowable Silver
B C I
Designation of Wires Sectional (Explanatory Lead-Alloy of Nickel Nickel Nickel
D
Each Wire, in. Diameter, in. Coated
Area, cmils Note 2) Coated
E J E
18–7 7 0.0159 1 770 0.050 0.50 to 0.70 6.54 6.16 6.42(2) 7.00 8.67
E J E
20–19 10 0.0080 1 216 0.042 0.45 to 0.55 9.76 9.10 9.68(4) 10.3 12.8
E J E
20–19 19 0.0080 1 216 0.042 0.45 to 0.55 9.76 9.10 9.68(4) 10.3 12.8
H
20–19† 10 0.0100 1 000 0.040 0.45 to 0.55 11.8 11.0 11.5(2) 12.5 15.5
E H
20–10 10 0.0100 1 000 0.040 0.45 to 0.55 11.8 11.0 11.5(2) 12.5 15.5
E J E
20–7 7 0.0126 1 111 0.039 0.45 to 0.55 10.4 9.81 10.2(2) 11.1 13.8
E J E
22–19 19 0.0063 754 0.033 0.25 to 0.43 15.9 14.8 15.7(4) 16.8 20.8
E J E
22–7 7 0.0100 700 0.031 0.25 to 0.43 16.7 15.6 16.2(2) 17.7 21.9
E J E
24–19 19 0.0050 475 0.027 0.25 to 0.35 25.4 23.6 25.2(4) 26.9 33.3
E J E
24–7 7 0.0080 448 0.025 0.25 to 0.35 26.2 24.5 26.0(4) 27.8 34.4
E J E
26–19 19 0.0040 304 0.022 0.25 to 0.30 40.1 37.3 41.0(7) 42.4 52.6
E J E
26–7 7 0.0063 278 0.020 0.25 to 0.30 42.6 39.7 42.2(4) 45.1 55.9
E J E
28–19 19 0.0031 183 0.017 0.25 to 0.30 67.7 63.1 69.3(7) 71.7 88.8
E J E
28–7 7 0.0050 175 0.016 0.25 to 0.30 68.2 63.6 67.6(4) 72.2 89.5
E J E
30–7 7 0.0040 112 0.013 0.25 to 0.30 108.0 100.0 110.0(7) 114.0 141.0
E J g
32–7 7 0.0031 67 0.011 0.10 to 0.30 182.0 170.0 186.0(7) 193.0 239.0
E J G
32–7 7 0.0031 67 0.011 0.10 to 0.30 182.0 170.0 186.0(7) 193.0 239.0
A
Provides minimum of 50 μin. of nickel.
B
These size designations are solely for purposes of identification. They should not be confused with AWG sizes.
C
The stranded conductor constructions shown in this table provide for finished noninsulated conductors having the indicated cross-sectional area. The number of component wires may vary slightly provided the specified
resistances are not exceeded.
D
The maximum allowable diameters of these conductors are given here for guidance in making calculations regarded insulating material, etc. These diameters do not include allowance for distortion of the conductor
during stranding and are not intended to be used as limiting values.
E
The cross-sectional areas of these conductor-size designations deviate by more than 2 per cent from the nominal areas of the standard AWG sizes as defined in Specification B258.
F
Nineteen member ropes.
G
Seven member ropes.
H
Bunch-stranded.
I
The numbers in parentheses indicate the class of nickel coating required to meet resistance values tabulated. These classes appear in Specification B355.
J
Concentric-stranded.
†Editorially corrected.
B286 − 20
3.1.2 Conductor size, designation, construction, and type (Table 1).
3.1.3 Whether tin, lead alloy, silver-coated, or nickel-coated (see 4.1).
3.1.4 For silver-coated conductors and nickel-coated conductors, class of coating (see 4.1), and when required, unannealed (see
4.2),
3.1.5 Desired constructions where alternates are given (Table 1, Type II and, 5.1, 6.1, and 6.2),
3.1.6 Package size (Section 12).
3.1.7 Special package marking if required (Section 11), and
3.1.8 Place of inspection (Section 10).
4. General Requirements
4.1 Coating of Wires—The coating of the solid conductors and the wires composing stranded conductors (before stranding) shall
conform to the coating requirements of ASTM Specifications B33, B189, B298, and B355, as indicated on the purchase order.
4.2 Temper—Unless otherwise specified, all coated conductors shall be furnished in the annealed temper. When so specified,
silver-coated conductors or nickel-coated conductors shall be furnished unannealed (Explanatory Note 1).
NOTE 1—The term unannealed as used in this specification means cold-worked conductor as produced on commercial wire-drawing machines.
4.3 Elongation—The elongation of annealed Type I conductors shall be as specified in Specifications B33, B189, B298, and B355
as applicable. The elongation of stranded conductors shall be permitted to vary from the requirements of the applicable
Specifications: B33, B189, B298, and B355 by the following amounts:
4.3.1 For stranded conductors 22 AWG and smaller, the test shall be performed on the whole conductor and the elongation
measured when the first strand of the conductor breaks. The minimum average elongation shall not be less than 10 % with no
individual specimen less than 5 %.
4.3.2 For stranded conductors larger than 22 AWG, strands shall be carefully removed from the conductor and tested for
elongation. The minimum av
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