ASTM B174-17
(Specification)Standard Specification for Bunch-Stranded Copper Conductors for Electrical Conductors
Standard Specification for Bunch-Stranded Copper Conductors for Electrical Conductors
ABSTRACT
This specification covers bare bunch-stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead-alloy for use as electrical conductors. Coated wires shall include only those wires with finished diameters and densities substantially equal to the respective diameters and densities of uncoated wires. Bunch-stranded conductors are classified as Class I, Class J, Class K, Class L, Class M, Class O, Class P, and Class Q, according to wire diameter. Requirements for conductor joints, lay length, wires, and strand construction are given. Electrical and elongation tests of wires composing the conductors shall be performed. If a tinning, lead-coating, or lead-alloy-coating test is required, it shall be made on the wires prior to stranding. The methods of determining mass, cross sections, and electrical resistance are detailed. The density of copper to be taken in the calculations is prescribed.
SCOPE
1.1 This specification covers bare bunch-stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead-alloy for use as electrical conductors (Explanatory Note 1 and Explanatory Note 2).
1.2 Coated wires shall include only those wires with finished diameters and densities substantially equal to the respective diameters and densities of uncoated wires.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3.1 For conductor sizes designated by AWG or kcmil, the requirements in SI units have been numerically converted from corresponding values, stated or derived, in inch-pound units. For conductor sizes designated by SI units only, the requirements are stated or derived in SI units.
1.4 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.
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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.
Designation:B174 −17
Standard Specification for
Bunch-Stranded Copper Conductors for Electrical
1
Conductors
This standard is issued under the fixed designation B174; 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.
2
1. Scope 2.2 ASTM Standards:
B3 Specification for Soft or Annealed Copper Wire
1.1 This specification covers bare bunch-stranded conduc-
B33 Specification for Tin-Coated Soft or Annealed Copper
tors made from round copper wires, either uncoated or coated
Wire for Electrical Purposes
with tin, lead, or lead-alloy for use as electrical conductors
B172 Specification for Rope-Lay-Stranded Copper Conduc-
(Explanatory Note 1 and Explanatory Note 2).
torsHavingBunch-StrandedMembers,forElectricalCon-
1.2 Coated wires shall include only those wires with fin-
ductors
ished diameters and densities substantially equal to the respec-
B189 Specification for Lead-Coated and Lead-Alloy-Coated
tive diameters and densities of uncoated wires.
Soft Copper Wire for Electrical Purposes
B193 Test Method for Resistivity of Electrical Conductor
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in Materials
B263 Test Method for Determination of Cross-Sectional
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining Area of Stranded Conductors
B354 Terminology Relating to Uninsulated Metallic Electri-
values from the two systems may result in non-conformance
with the standard. cal Conductors
2.3 American National Standard:
1.3.1 For conductor sizes designated byAWG or kcmil, the
3
requirements in SI units have been numerically converted from ANSI C42.35 Definitions of Electrical Terms
corresponding values, stated or derived, in inch-pound units.
3. Classification
For conductor sizes designated by SI units only, the require-
ments are stated or derived in SI units. 3.1 For the purpose of this specification bunch-stranded
conductors are classified as shown in Tables 1 and 2.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Ordering Information
ization established in the Decision on Principles for the
4.1 Orders for material under this specification shall include
Development of International Standards, Guides and Recom-
the following information:
mendations issued by the World Trade Organization Technical
4.1.1 Quantity of each size and class,
Barriers to Trade (TBT) Committee.
4.1.2 Conductor size: circular-mil area or AWG (see 7.1),
4.1.3 Class (Section 3 and Table 3),
2. Referenced Documents
4.1.4 Whether coated or uncoated; if coated, designate type
2.1 The following documents of the issue in effect at the
of coating (see 11.1),
time of reference form a part of this specification to the extent
4.1.5 Maximum length of lay (see 6.3),
referenced herein:
4.1.6 Whether separator is required (see 7.2),
1 2
This specification is under the jurisdiction of ASTM Committee B01 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Conductors of Copper and Copper Alloys. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2017. Published April 2017. Originally the ASTM website.
3
approved in 1941. Last previous edition approved in 2015 as B174 – 10 (2015). Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
DOI: 10.1520/B0174-17. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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B174−17
A
TABLE 1 A Classification and Construction Requirements of Bunch-Stranded Conductors —Class I Bunch Stranded Conductors
Area of Classification, Uncoated Copper Coated Copper
Cross Section Size,
and
Minimum
Number
of Wires
Size, Class I Nominal dc Maximum dc Nominal dc Maximum dc Nominal dc Maximum dc Nominal dc Maximum dc
AWG Nominal resistance resistance resistance resistance resistance resistance resistance resistance
Wire @20C @20C @20C @20C @20C @20C @20C @20C
Diameter
0.0201 In.
...
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: B174 − 10 (Reapproved 2015) B174 − 17
Standard Specification for
Bunch-Stranded Copper Conductors for Electrical
1
Conductors
This standard is issued under the fixed designation B174; 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 bare bunch-stranded conductors made from round copper wires, either uncoated or coated with tin,
lead, or lead-alloy for use as electrical conductors (Explanatory Note 1 and Explanatory Note 2).
1.2 Coated wires shall include only those wires with finished diameters and densities substantially equal to the respective
diameters and densities of uncoated wires.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.3.1 For conductor sizes designated by AWG or kcmil, the requirements in SI units have been numerically converted from
corresponding values, stated or derived, in inch-pound units. For conductor sizes designated by SI units only, the requirements are
stated or derived in SI units.
1.4 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 at the time of reference form a part of this specification to the extent
referenced herein:
2
2.2 ASTM Standards:
B3 Specification for Soft or Annealed Copper Wire
B33 Specification for Tin-Coated Soft or Annealed Copper Wire for Electrical Purposes
B172 Specification for Rope-Lay-Stranded Copper Conductors Having Bunch-Stranded Members, for Electrical Conductors
B189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes
B193 Test Method for Resistivity of Electrical Conductor Materials
B263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors
B354 Terminology Relating to Uninsulated Metallic Electrical Conductors
2.3 American National Standard:
3
ANSI C42.35 Definitions of Electrical Terms
3. Classification
3.1 For the purpose of this specification bunch-stranded conductors are classified as shown in Tables 1 and 2.
1
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 April 1, 2015April 1, 2017. Published April 2015April 2017. Originally approved in 1941. Last previous edition approved in 20102015 as B174 –
10. 10 (2015). DOI: 10.1520/B0174-10R15.10.1520/B0174-17.
2
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.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B174 − 17
A
TABLE 1 A Classification and Construction Requirements of Bunch-Stranded Conductors —Class I Bunch Stranded Conductors
Area of Classification, Uncoated Copper Coated Copper
Cross Section Size,
and
Minimum
Number
of Wires
Size, Class I Nominal dc Maximum dc Nominal dc Maximum dc Nominal dc Maximum dc Nominal dc Maximum dc
AWG Nominal resistance resistance resistance resistance resistance resistance resistance resistance
Wire @20C @20C @20C @20C @20C @20C @20C @20C
Diameter
0.0201 In.
(0.511 mm)
cmil mm 24 AWG ohm/kft ohm/kft ohm/km ohm/km ohm/kft ohm/kft ohm/km ohm/km
20820 10.5 7 52 0.508 0.518 1.67 1.70 0.528 0.539 1.73 1.77
16510 8.37 8 41 0.641 0.654 2.10 2.14 0.666 0.679 2.19 2.23
13090 6.63 9 33 0
...
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