ASTM B172-01

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Designation: B 172 – 01
Standard Specification for
Rope-Lay-Stranded Copper Conductors Having Bunch-
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Stranded Members, for Electrical Conductors
This standard is issued under the fixed designation B 172; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope B 263 Test Method for Determination of Cross-Sectional
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Area of Stranded Conductors
1.1 This specification covers bare rope-lay-stranded con-
B 354 Terminology Relating to Uninsulated Metallic Elec-
ductors having bunch-stranded members made from round
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trical Conductors
copper wires, either uncoated or coated with tin, lead, or
2.3 American National Standard:
lead-alloy for use as electrical conductors (Explanatory Notes
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ANSI C42.35 Definitions of Electrical Terms
1 and 2).
1.2 Coated wires shall include only those wires with fin-
3. Classification
ished diameters and densities substantially equal to the respec-
3.1 For the purpose of this specification rope-lay-stranded
tive diameters and densities of uncoated wires.
conductors having bunch-stranded members are classifed as
1.3 The values stated in inch-pound or SI units are to be
follows:
regarded separately as standard. Each system shall be used
3.1.1 Class I—Conductors consisting of wires 0.0201 in.
independently of the other. Combining values from the two
(0.511 mm) diameter (No. 24 AWG) to produce rope-lay-
systems may result in nonconformance with the specification.
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stranded conductors up to 2 000 000 cmil (1013 mm ) in total
For conductor sizes designated by AWG or kcmil, the require-
cross-sectional area. (Typical use is for special apparatus
ments in SI units have been numerically converted from
conductor.)
corresponding values, stated or derived, in inch-pound units.
3.1.2 Class K—Conductors consisting of wires 0.0100 in.
For conductor sizes designated by SI units only, the require-
(0.254 mm) diameter (No. 30 AWG) to produce rope-lay-
ments are stated or derived in SI units.
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stranded conductors up to 1 000 000 cmil (507 mm ) in total
1.3.1 For density, resistivity, and temperature, the values
cross-sectional area. (Typical use is for special portable cord
stated in SI units are to be regarded as standard.
and conductors.)
2. Referenced Documents 3.1.3 Class M—Conductors consisting of wires 0.0063 in.
(0.160 mm) diameter (No. 34 AWG) to produce rope-lay-
2.1 The following documents of the issue in effect at the
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stranded conductors up to 1 000 000 cmil (507 mm ) in total
time of reference form a part of this specification to the extent
cross-sectional area. (Typical use is for welding conductors.)
referenced herein:
2.2 ASTM Standards:
4. Ordering Information
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B 3 Specification for Soft or Annealed Copper Wire
4.1 Orders for material under this specification shall include
B 33 Specification for Tinned Soft or Annealed Copper
2 the following information:
Wire for Electrical Purposes
4.1.1 Quantity of each size and class,
B 173 Specification for Rope-Lay-Stranded Copper Con-
4.1.2 Conductor size: circular-mil area or AWG (see 7.1),
ductors Having Concentric-Stranded Members, for Elec-
2 4.1.3 Class (Section 4 and Table 1),
trical Conductors
4.1.4 Whether coated or uncoated; if coated, designate type
B 189 Specification for Lead-Coated and Lead-Alloy-
2 of coating (see 11.1),
Coated Soft Copper Wire for Electrical Purposes
4.1.5 Details of special-purpose lays, if required (see 6.2
and 6.3 and Explanatory Note 3),
4.1.6 Package size (see 15.1),
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This specification is under the jurisdiction of ASTM Committee B01 on
4.1.7 Special package marking, if required (Section 14),
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
Conductors of Copper and Copper Alloys.
Current edition approved Mar. 10, 2001. Published May 2001. Originally issued
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1942 to replace portions of B 158–41 T. Last previous edition B 172 – 95. Available from American National Standards Institute, 11 West 42nd Street,
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Annual Book of ASTM Standards, Vol 02.03. 13th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B 172
A
TABLE 1 Construction Requirements of Rope-Lay Stranded Copper Conductors Having Bunch-Stranded Members
Class I Class K Class M
Wire Wire Wire
Area of
Diameter Diameter Diameter
Cross
0.0201 0.0100 0.0063
Section
Size in. in. in.
AWG (0.511 Approximate (0.254 Approximate (0.160 Approximate
B B B
mm) Mass mm) Mass mm) Mass
cmil mm Nominal Strand lb/ kg/ Nominal Strand lb/ kg/ Nominal Strand lb/ kg/
C C C
Number Constr
...