ASTM B286-07(2017)

Standard Specification for Copper Conductors for Use in Hookup Wire for Electronic Equipment

ABSTRACT
This specification covers uninsulated metallic-coated copper conductors for use in hookup wire for electronic equipment. The coating of the solid conductors and the wires composing stranded conductors shall conform to the coating requirements. Unless otherwise specified, all coated conductors shall be furnished in the annealed temper. The elongation of Type I conductors shall be as specified in the reference material. For Type II 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. Solid conductors shall conform to the requirements for Type I conductors, while stranded conductors shall conform to the requirements for Type II conductors. The direction and length of lay of the outside layer of stranded conductors are presented. The test methods to determine the conformance to coating, elongation, and electrical resistance requirements are presented in details.
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.

General Information

• Status: Historical
• Publication Date: 14-May-2017
• ICS: 29.060.10 - Wires
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.04 - Conductors of Copper and Copper Alloys

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B286 −07 (Reapproved 2017)
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 B355 SpecificationforNickel-CoatedSoftorAnnealedCop-
per Wire
1.1 This specification covers uninsulated metallic-coated
copper conductors for use in hookup wire for electronic
3. Ordering Information
equipment.
3.1 Orders for material under this specification shall include
1.2 The SI values for density are to be regarded as standard.
the following information:
For all other properties, the inch-pound values are to be
3.1.1 Quantity of each size, designation (Table 1) and type,
regarded as the standard.
3.1.2 Conductor size, designation, construction, and type
1.3 This international standard was developed in accor- (Table 1).
dance with internationally recognized principles on standard- 3.1.3 Whether tin, lead alloy, silver-coated, or nickel-coated
ization established in the Decision on Principles for the (see 4.1).
Development of International Standards, Guides and Recom- 3.1.4 For silver-coated conductors and nickel-coated
mendations issued by the World Trade Organization Technical conductors, class of coating (see 4.1), and when required,
Barriers to Trade (TBT) Committee. unannealed (see 4.2),
3.1.5 Desired constructions where alternates are given
2. Referenced Documents
(Table 1, Type II and, 5.1, 6.1, and 6.2),
3.1.6 Package size (Section 12).
2.1 The following documents of the issue in effect on date
3.1.7 Special package marking if required (Section 11), and
of material purchase form a part of this specification to the
3.1.8 Place of inspection (Section 10).
extent referenced herein:
2.2 ASTM Standards:
4. General Requirements
B33 Specification for Tin-Coated Soft or Annealed Copper
4.1 Coating of Wires—The coating of the solid conductors
Wire for Electrical Purposes
and the wires composing stranded conductors (before strand-
B189 Specification for Lead-Coated and Lead-Alloy-Coated
ing) shall conform to the coating requirements of ASTM
Soft Copper Wire for Electrical Purposes
Specifications B33, B189, B298, and B355, as indicated on the
B193 Test Method for Resistivity of Electrical Conductor
purchase order.
Materials
4.2 Temper—Unless otherwise specified, all coated conduc-
B258 Specification for Nominal Diameters and Cross-
tors shall be furnished in the annealed temper. When so
SectionalAreasofAWGSizesofSolidRoundWiresUsed
specified, silver-coated conductors or nickel-coated conductors
as Electrical Conductors
shall be furnished unannealed (Explanatory Note 1).
B298 Specification for Silver-Coated Soft orAnnealed Cop-
per Wire
NOTE 1—The term unannealed as used in this specification means
cold-worked conductor as produced on commercial wire-drawing ma-
chines.
This specification is under the jurisdiction of ASTM Committee B01 on
4.3 Elongation—The elongation of annealedType I conduc-
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
tors shall be as specified in Specifications B33, B189, B298,
Conductors of Copper and Copper Alloys.
and B355 as applicable.The elongation of stranded conductors
Current edition approved May 15, 2017. Published May 2017. Originally
shall be permitted to vary from the requirements of the
approved in 1954. Last previous edition approved in 2012 as B286 – 07 (2012).
DOI: 10.1520/B0286-07R17.
applicable Specifications: B33, B189, B298, and B355 by the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
following amounts:
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.3.1 For stranded conductors 22AWG and smaller, the test
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. shall be performed on the whole conductor and the elongation
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B286−07 (2017)
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

B286−07 (2017)
TABLE1 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
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 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
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.
B286−07 (2017)
measured when the first strand of the conductor breaks. The be such that the diameter, configuration, conductor resistance,
minimum average elongation shall not be less than 10 % with flexibility, and mechanical strength are not substantially af-
no individual specimen less than 5 %. fected.
4.3.2 For stranded conductors larger than 22 AWG, strands
8. Physical and Electrical Tests
shall be carefully removed from the conductor and tested for
8.1 Tests to determine conformance of the coating to the
elongation. The minimum average elongation shall not be less
requirementsofSpecificationsB33,B189,B298,orB355shall
than 10 % with no individual strand less than 5 %.
beperformedonTypeIconductorsbeforeinsulatingandonthe
4.4 D-C Resistance—The d-c resistance in ohms per 1000 ft
individual wires of Type II conductors before stranding.
of annealed solid and stranded conductor shall not exceed,
8.2 Tests to determine conformance to the elongation re-
before insulating, the appropriate values prescribed in Table 1
quirements prescribed in 4.3 shall be made before insulating.
(Explanatory Note 2).
8.3 Tests to determine conformance to the electrical resis-
5. Conductor Construction
tance requirements prescribed in Table 1 shall be made on the
5.1 Solid conductors shall conform to the requirements for
uninsulated conductor in accordance with Test Method B193
Type I conductors prescribed in Table 1. (Explanatory Note 2).
5.2 Stranded conductors shall conform to the requirements
8.4 Examination for Workmanship of Finished Uninsulated
for Type II conductors prescribed in Table 1. The method of StrandedConductor—Avisual inspection with the unaided eye
stranding for conductor size designations 32-7 through 10-104
shall be performed on the outer layer of the conductor on the
inclusive shall be at the option of the manufacturer unless supplied package. Use a white card (as a background) to
otherwise specified. Stranded conductors size designation 10-
ascertain if any base metal is exposed through a break in the
105 and larger shall normally be furnished in a rope-lay- coating. Detection of any base metal constitutes rejection.
stranded construction consisting of either 7 or 19 bunch-
8.5 Examination for Workmanship of Finished Uninsulated
stranded members.
Stranded Conductor—A visual inspection with 10X magnifi-
cation and with a white background shall be performed on a
6. Lay of Stranded Conductors
conductorsampletakenfromthetopofthesuppliedspool.The
6.1 The direction of lay of the outside layer of stranded
sample shall be a minimum of 12 in. (30 cm) in length. The
conductors shall be left-hand. The direction of lay of the
outer surface of all stranded constructions shall be examined.
bunch-stranded members composing rope-lay-stranded con-
Detection of excessive exposed base metal due to the
ductors shall be at the option of the manufacturer unless
stranding process, such as indications along one side of the
otherwise specified.
sample due to excessive localized abrasion during stranding,
constitutes rejection. Continuous lines or patterns of exposed
6.2 The direction of lay of the outer layer of rope-lay-
stranded conductors shall be lefthand. The direction of lay of base metals constitute rejection. Small random point failures
shall not be cause for rejection.
the other layers shall be reversed in successive layers, unless
otherwise specified.
9. Density
6.3 The length of lay of the outside layer of stranded
9.1 For the purpose of calculating mass, cross-sectional
conductors in size designation 32-7 through 10-104, inclusive,
area, etc., the density of the coated copper shall be taken as
shall conform to the values in Table 1 (Explanatory Note 3).
3 3
8.89 g/cm (0.32117 lb/in. ) at 20°C (Explanatory Note 5).
For strand constructions containing more than one distinct
10. Inspection
layer the length of lay of the inner layer shall not exceed the
maximum value shown in Table 1 for the conductor in
10.1 All tests and inspection shall be made at the place of
question. For rope-lay-stranded conductors size designation
manufacture unless otherwise especially agreed upon by the
10-105 and larger, and size 49/0
...

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 2012) B286 − 07 (Reapproved 2017)
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 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,
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.
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 Oct. 15, 2012May 15, 2017. Published November 2012May 2017. Originally approved in 1954. Last previous edition approved in 20072012
as B286 – 07.B286 – 07 (2012). DOI: 10.1520/B0286-07R12. 10.1520/B0286-07R17.
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’sstandard’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 − 07 (2017)
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 − 07 (2017)
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
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 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
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 − 07 (2017)
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 average elongation shall not be less than 10 % with no individual strand less than 5 %.
4.4 D-C Resistance—The d-c resistance in ohms per 1000 ft of annealed solid and stranded conductor shall not exceed, before
insulating, the appropriate values prescribed in Table 1 (Explanatory Note 2).
5. Conductor Construction
5.1 Solid conductors shall conform to the requirements for Type I conductors prescribed in Table 1.
5.2 Stranded conductors shall conform to the requirements for Type II conductors prescribed in Table 1. The method of
stranding for conductor size designations 32-7 through 10-104 inclusive shall be at the option of the manufacturer unless otherwise
specified. Stranded conductors size designation 10-105 and larger shall normally be furnished in a rope-lay-stranded construction
consisting of either 7 or 19 bunch-stranded members.
6. Lay of Stranded Conductors
6.1 The direction of lay of the outside layer of stranded conductors shall be left-hand. The direction of lay of the bunch-stranded
members composing rope-lay-stranded conductors shall be at the option of the manufacturer unless otherwise specified.
6.2 The direction of lay of the outer layer of rope-lay-stranded conductors shall be lefthand. The direction of lay of the other
layers shall be reversed in successive layers, unless otherwise specified.
6.3 The length of lay of the outside layer of stranded conductors in size designation 32-7 through 10-104, inclusive, shall
conform to the values in Table 1 (Explanatory Note 3). For strand constructions containing more than one distinct layer the length
of lay of the inner layer shall not exceed the maximum value shown in Table 1 for the conductor in question. For rope-lay-stranded
conductors size designation 10-105 and larger, and size 49/0.0142, the length of lay of the wires composing the bunch-stranded
members shall be not more than 30 times the diameter of the member, and the length of lay of the outer layer of rope-lay-stranded
conductors shall be not less than 8 nor more than 16 times the outside diameter of the completed conductor.
7. Joints
7.1 Necessary joints in the individual wires of conductors size designation 32-7 through size designation 10-104, inclusive, may
be silver soldered, brazed, or butt welded. (Explanatory Note 4). Bunch-stranded members composing ropelay-stranded conductors
may be joined as a unit by brazing and these joints shall be at least two lay lengths apart and be finished off so that the conductor
diameter is not increased at the joint. Disposition of joints throughout the conductor shall be such that the diameter, configuration,
conductor resistance, flexibility, and mechanical strength are not substantially affected.
8. Physical and Electrical Tests
8.1 Tests to determine conformance of the coating to the requirements of Specifications B33, B189, B298, or B355 shall be
performed on Type I conductors before insulating and on the individual wires of Type II conductors before stranding.
8.2 Tests to determine conformance to the elongation requirements prescribed in 4.3 shall be made before insulating.
8.3 Tests to determine conformance to the electrical resistance requirements prescribed in Table 1 shall be made on the
uninsulated conductor in accordance with Test Method B193 (Explanatory Note 2).
8.4 Examination for workmanship of finished uninsulated stranded conductor—Workmanship of Finished Uninsulated Stranded
Conductor—A visual inspection with the unaided e
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