ASTM B286-07(2012)

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.

General Information

• Status: Historical
• Publication Date: 14-Oct-2012
• ICS: 29.060.10 - Wires
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.04 - Conductors of Copper and Copper Alloys

Relations

• Replaces: ASTM B286-07 - Standard Specification for Copper Conductors for Use in Hookup Wire for Electronic Equipment
• Effective Date: 15-Oct-2012
• Referred By: ASTM B470-02(2017) - Standard Specification for Bonded Copper Conductors for Use in Hookup Wires for Electronic Equipment
• Effective Date: 15-Oct-2012
• Referred By: ASTM B961-13(2019) - Standard Specification for Silver Coated Copper and Copper Alloy Stranded Conductors for Electronic Space Application
• Effective Date: 15-Oct-2012

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 2012)
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 Department of Defense.
1. Scope 3.1.2 Conductor size, designation, construction, and type
(Table 1).
1.1 This specification covers uninsulated metallic-coated
3.1.3 Whether tin, lead alloy, silver-coated, or nickel-coated
copper conductors for use in hookup wire for electronic
(see 4.1).
equipment.
3.1.4 For silver-coated conductors and nickel-coated
1.2 The SI values for density are to be regarded as standard.
conductors, class of coating (see 4.1), and when required,
For all other properties, the inch-pound values are to be
unannealed (see 4.2),
regarded as the standard.
3.1.5 Desired constructions where alternates are given
(Table 1, Type II and, 5.1, 6.1, and 6.2),
2. Referenced Documents
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:
4. General Requirements
2.2 ASTM Standards:
4.1 Coating of Wires—The coating of the solid conductors
B33 Specification for Tin-Coated Soft or Annealed Copper
and the wires composing stranded conductors (before strand-
Wire for Electrical Purposes
ing) shall conform to the coating requirements of ASTM
B189 Specification for Lead-Coated and Lead-Alloy-Coated
Specifications B33, B189, B298, and B355, as indicated on the
Soft Copper Wire for Electrical Purposes
purchase order.
B193 Test Method for Resistivity of Electrical Conductor
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-
NOTE 1—The term unannealed as used in this specification means
per Wire
cold-worked conductor as produced on commercial wire-drawing ma-
B355 SpecificationforNickel-CoatedSoftorAnnealedCop-
chines.
per Wire
4.3 Elongation—The elongation of annealedType I conduc-
tors shall be as specified in Specifications B33, B189, B298,
3. Ordering Information
and B355 as applicable.The elongation of stranded conductors
3.1 Orders for material under this specification shall include
shall be permitted to vary from the requirements of the
the following information:
applicable Specifications: B33, B189, B298, and B355 by the
3.1.1 Quantity of each size, designation (Table 1) and type,
following amounts:
4.3.1 For stranded conductors 22AWG and smaller, the test
This specification is under the jurisdiction of ASTM Committee B01 on
shall be performed on the whole conductor and the elongation
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
measured when the first strand of the conductor breaks. The
Conductors of Copper and Copper Alloys.
minimum average elongation shall not be less than 10 % with
Current edition approved Oct. 15, 2012. Published November 2012. Originally
no individual specimen less than 5 %.
approved in 1954. Last previous edition approved in 2007 as B286 – 07. DOI:
10.1520/B0286-07R12.
4.3.2 For stranded conductors larger than 22 AWG, strands
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
shall be carefully removed from the conductor and tested for
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
elongation. The minimum average elongation shall not be less
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. than 10 % with no individual strand less than 5 %.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B286−07 (2012)
4.4 D-C Resistance—The d-c resistance in ohms per 1000 ft beperformedonTypeIconductorsbeforeinsulatingandonthe
of annealed solid and stranded conductor shall not exceed, individual wires of Type II conductors before stranding.
before insulating, the appropriate values prescribed in Table 1
8.2 Tests to determine conformance to the elongation re-
(Explanatory Note 2).
quirements prescribed in 4.3 shall be made before insulating.
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
stranded conductor—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 magnifica-
6. Lay of Stranded Conductors tion and with a white background shall be performed on a
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,
6.2 The direction of lay of the outer layer of rope-lay-
constitutes rejection. Continuous lines or patterns of exposed
stranded conductors shall be lefthand. The direction of lay of
base metals constitute rejection. Small random point failures
the other layers shall be reversed in successive layers, unless
shall not be cause for rejection.
otherwise specified.
9. Density
6.3 The length of lay of the outside layer of stranded
conductors in size designation 32-7 through 10-104, inclusive,
9.1 For the purpose of calculating mass, cross-sectional
shall conform to the values in Table 1 (Explanatory Note 3).
area, etc., the density of the coated copper shall be taken as
3 3
For strand constructions containing more than one distinct
8.89 g/cm (0.32117 lb/in. ) at 20°C (Explanatory Note 5).
layer the length of lay of the inner layer shall not exceed the
maximum value shown in Table 1 for the conductor in
10. Inspection
question. For rope-lay-stranded conductors size designation
10.1 All tests and inspection shall be made at the place of
10-105 and larger, and size 49/0.0142, the length of lay of the
manufacture unless otherwise especially agreed upon by the
wires composing the bunch-stranded members shall be not
manufacturer and the purchaser at the time of purchase. The
more than 30 times the diameter of the member, and the length
manufacturer shall afford the inspector representing the pur-
of lay of the outer layer of rope-lay-stranded conductors shall
chaser all reasonable facilities, without charge, to satisfy him
be not less than 8 nor more than 16 times the outside diameter
that the material is being furnished in accordance with this
of the completed conductor.
specification.
7. Joints
11. Product Marking
7.1 Necessary joints in the individual wires of conductors
11.1 The net mass, length (or lengths, and number of
size designation 32-7 through size designation 10-104,
lengths, if more than one length is included in the package),
inclusive, may be silver soldered, brazed, or butt welded.
size designation, type of conductor, purchase order number,
(Explanatory Note 4). Bunch-stranded members composing
and any other marks required by the purchase order shall be
ropelay-strandedconductorsmaybejoinedasaunitbybrazing
marked on a tag attached to the end of the conductor inside of
and these joints shall be at least two lay lengths apart and be
the package. The same information, together with the manu-
finished off so that the conductor diameter is not increased at
facturer’s serial number (if any) and all shipping marks
the joint. Disposition of joints throughout the conductor shall
required by the purchaser, shall appear on the outside of each
be such that the diameter, configuration, conductor resistance,
package.
flexibility, and mechanical strength are not substantially af-
fected.
12. Packing and Package Marking
8. Physical and Electrical Tests
12.1 Package sizes for conductors shall be agreed upon by
8.1 Tests to determine conformance of the coating to the the manufacturer and the purchaser in the placing of individual
requirementsofSpecificationsB33,B189,B298,orB355shall orders.
B286−07 (2012)
12.2 The conductors shall be protected against damage in
ordinary handling and shipping.
13. Keywords
13.1 copper hookup wire; electronic equipment hookup
wire; electronic hookup wire; hookup wire
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
...