ASTM B8-04
(Specification)Standard Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft
Standard Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft
ABSTRACT
This specification covers standard requirements for bare-concentric-lay stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layers of helically laid wires. The conductors shall be classified as follows: Class AA, Class A, Class B, Class C, and Class D. Sizes, number of wires, and diameter of wires in the various classes of concentric-lay-stranded conductors shall conform to the prescribed requirements. Welds and brazes may be made in rods or in wires prior to final drawing. The completed conductor of varying classes shall conform to the minimum distance required between the joints. Diameters, areas, and mass of concentric-lay-stranded copper conductors shall conform to the prescribed requirements. Physical and electrical tests of conductors stranded of hard-drawn or medium-hard-drawn wires shall be conducted before but not after stranding. The approximate mass and electrical resistance may be determined using the required increments. The material shall also conform to the temperature corrections factor for conductor resistance.
SCOPE
1.1 This specification covers bare concentric-lay-stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layers of helically laid wires. Note 1This specification also permits conductors for use as covered or insulated electrical conductors.Note 2
Sealed conductors, that are intended to prevent longitudinal water propagation and are further covered/insulated, are also permitted within the guidelines of this specification.
1.2 For the purposes of this specification, conductors are classified as follows (Explanatory NOTE 1 and NOTE 2):
1.2.1 Class AAFor bare conductors usually used in overhead lines.
1.2.2 Class AFor conductors to be covered with weather-resistant (weather-proof), slow-burning materials, and for bare conductors where greater flexibility than is afforded by Class AA is required.
1.2.3 Class BFor conductors to be insulated with various materials such as rubber, paper, varnished cloth, and so forth, and for the conductors indicated under Class A where greater flexibility is required.
1.2.4 Class C and Class DFor conductors where greater flexibility is required than is provided by Class B conductors.
1.3 The SI values for density are regarded as the standard. For all other properties, the inch-pound values are to be regarded as standard and the SI units may be approximate.
General Information
Relations
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: B8 – 04
Standard Specification for
Concentric-Lay-Stranded Copper Conductors, Hard,
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Medium-Hard, or Soft
This standard is issued under the fixed designation B8; the number immediately following the designation indicates the year of original
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
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 B2 Specification for Medium-Hard-Drawn Copper Wire
B3 Specification for Soft or Annealed Copper Wire
1.1 This specification covers bare concentric-lay-stranded
B33 SpecificationforTinnedSoftorAnnealedCopperWire
conductors made from round copper wires, either uncoated or
for Electrical Purposes
coatedwithtin,lead,orleadalloyforgeneraluseforelectrical
B172 Specification for Rope-Lay-Stranded Copper Con-
purposes. These conductors shall be constructed with a central
ductors Having Bunch-Stranded Members, for Electrical
core surrounded by one or more layers of helically laid wires.
Conductors
NOTE 1—This specification also permits conductors for use as covered
B173 Specification for Rope-Lay-Stranded Copper Con-
or insulated electrical conductors.
ductors Having Concentric-Stranded Members, for Elec-
NOTE 2—Sealed conductors, that are intended to prevent longitudinal
trical Conductors
water propagation and are further covered/insulated, are also permitted
B174 Specification for Bunch-Stranded Copper Conductors
within the guidelines of this specification.
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for Electrical Conductors
1.2 For the purposes of this specification, conductors are
B189 Specification for Lead-Coated and Lead-Alloy-
classified as follows (Explanatory Note 1 and Note 2):
Coated Soft Copper Wire for Electrical Purposes
1.2.1 Class AA—For bare conductors usually used in over-
B193 Test Method for Resistivity of Electrical Conductor
head lines.
Materials
1.2.2 Class A—For conductors to be covered with weather-
B246 Specification for Tinned Hard-Drawn and Medium-
resistant (weather-proof), slow-burning materials, and for bare
Hard-Drawn Copper Wire for Electrical Purposes
conductors where greater flexibility than is afforded by Class
B263 Test Method for Determination of Cross-Sectional
AA is required.
Area of Stranded Conductors
1.2.3 Class B—For conductors to be insulated with various
B354 Terminology Relating to Uninsulated Metallic Elec-
materials such as rubber, paper, varnished cloth, and so forth,
trical Conductors
and for the conductors indicated under Class A where greater
B787/B787M Specification for 19 Wire Combination
flexibility is required.
Unilay-Stranded Copper Conductors for Subsequent Insu-
1.2.4 Class C and Class D—For conductors where greater
lation
flexibility is required than is provided by Class B conductors.
1.3 The SI values for density are regarded as the standard.
3. Ordering Information
For all other properties, the inch-pound values are to be
3.1 Ordersformaterialunderthisspecificationshallinclude
regarded as standard and the SI units may be approximate.
the following information:
3.1.1 Quantity of each size and class,
2. Referenced Documents
3.1.2 Conductor size: circular-mil area orAWG (Section 6),
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2.1 ASTM Standards:
3.1.3 Class (see 1.2 and Table 1),
B1 Specification for Hard-Drawn Copper Wire
3.1.4 Temper (see 13.2),
3.1.5 Whether coated or uncoated; if coated, designate type
1 of coating (see 13.1 and 13.2),
This specification is under the jurisdiction of ASTM Committee B01 on
3.1.6 Details of special-purpose lays, if required (see 5.4),
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
Conductors of Copper and Copper Alloys.
3.1.7 When physical tests shall be made (see 8.2 and 8.3),
Current edition approved April 1, 2004. Published April 2004. Originally
3.1.8 Package size (see 8.1),
approved in 1915. Last previous edition approved in 1999 as B8–99. DOI:
10.1520/B0008-04.
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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 Available from American Association of State Highway and Transportation
Standards volume information, refer to the standard’s Document Summary page on Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001.
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the ASTM website. Withdrawn.
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B8–04
TABLE 1 Construction Requirements of Concentric-Lay-Stranded Copper Conductors
A
Area of Size, Class AA Class A Class B Class C Class D
Cross-Section, American
Number of Diameter of Number of Diameter of Number of Diameter of Number of Diameter of Numbe
...
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