ASTM B231/B231M-23
(Specification)Standard Specification for Concentric-Lay-Stranded Aluminum 1350 Conductors
Standard Specification for Concentric-Lay-Stranded Aluminum 1350 Conductors
ABSTRACT
This specification covers aluminum 1350-H19, 1350-H16 or -H26, 1350-H14 or -H24, and 1350-H142 or -H242, bare concentric-lay-stranded conductors constructed with a straight round central wire surrounded by one or more layers of helically layered wires. Conductors are classified as Class AA for bare conductors usually used in overhead lines; Class A for conductors to be covered with weather resistant materials, and for bare conductors where greater flexibility than is afforded by Class AA is required; Class B for 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; and Classes C and D for conductors where greater flexibility is required than is provided by Class B conductors. Aluminum wire employed in Classes AA and A conductors shall be 1350-H19, unless otherwise specified. The temper of conductors of Classes B, C and D shall be designated. The direction of lay of the outer layer shall be right-hand for Classes AA and A and left-hand for other classes. The various classes of concentric-lay-stranded conductors shall conform to the required areas of cross section, numbers, and diameters of wires. The rated strength of 1350-H19 conductors shall be taken as the percent of the sum of the strengths of the component wires, calculated using the nominal wire diameters and the specified minimum average tensile strength given in Specification B 230/B 230M for 1350-H19 wire.
SCOPE
1.1 This specification covers aluminum 1350-H19 (extra hard), 1350-H16 or -H26 (3/4 hard), 1350-H14 or -H24 (1/2 hard), and 1350-H142 or -H242 (1/2 hard), bare concentric-lay-stranded conductors constructed with a straight round central wire surrounded by one or more layers of helically layed wires. The conductors are for general use for electrical purposes (Explanatory Note 1 and Note 2).
1.2 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.
1.2.1 For density, resistivity and temperature, the values stated in SI units are to be regarded as standard.
Note 1: Prior to 1975, aluminum 1350 was designated as EC aluminum.
Note 2: The aluminum and temper designations conform to ANSI Standard H35.1/H35.1M. Aluminum 1350 corresponds to Unified Numbering System A91350 in accordance with Practice E527.
Note 3: Sealed conductors that are intended to prevent longitudinal water propagation and are further covered/insulated are also permitted within the guidelines of this specification.
1.3 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.
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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: B231/B231M − 23
Standard Specification for
1
Concentric-Lay-Stranded Aluminum 1350 Conductors
This standard is issued under the fixed designation B231/B231M; 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:
B193 Test Method for Resistivity of Electrical Conductor
1.1 This specification covers aluminum 1350-H19 (extra
Materials
3 1
hard), 1350-H16 or -H26 ( ⁄4 hard), 1350-H14 or -H24 ( ⁄2
B230/B230M Specification for Aluminum 1350–H19 Wire
1
hard), and 1350-H142 or -H242 ( ⁄2 hard), bare concentric-lay-
for Electrical Purposes
stranded conductors constructed with a straight round central
B263 Test Method for Determination of Cross-Sectional
wire surrounded by one or more layers of helically layed wires.
Area of Stranded Conductors
The conductors are for general use for electrical purposes
B354 Terminology Relating to Uninsulated Metallic Electri-
(Explanatory Note 1 and Note 2).
cal Conductors
1.2 The values stated in either SI units or inch-pound units
B609/B609M Specification for Aluminum 1350 Round
are to be regarded separately as standard. The values stated in
Wire, Annealed and Intermediate Tempers, for Electrical
each system may not be exact equivalents; therefore, each
Purposes
system shall be used independently of the other. Combining
B682 Specification for Standard Metric Sizes of Electrical
values from the two systems may result in non-conformance
Conductors
with the standard.
E29 Practice for Using Significant Digits in Test Data to
1.2.1 For density, resistivity and temperature, the values
Determine Conformance with Specifications
stated in SI units are to be regarded as standard.
E527 Practice for Numbering Metals and Alloys in the
Unified Numbering System (UNS)
NOTE 1—Prior to 1975, aluminum 1350 was designated as EC
3
aluminum.
2.3 ANSI Documents:
NOTE 2—The aluminum and temper designations conform to ANSI
ANSI H35.1 American National Standard Alloy and Temper
Standard H35.1/H35.1M. Aluminum 1350 corresponds to Unified Num-
Designation System for Aluminum
bering System A91350 in accordance with Practice E527.
ANSI H35.1M American National Standard Alloy and
NOTE 3—Sealed conductors that are intended to prevent longitudinal
water propagation and are further covered/insulated are also permitted Temper Designation Systems for Aluminum [Metric]
within the guidelines of this specification. 4
2.4 NIST Document:
1.3 This international standard was developed in accor-
NBS Handbook 100—Copper Wire Tables
dance with internationally recognized principles on standard- 5
2.5 Aluminum Association Document:
ization established in the Decision on Principles for the
Publication 50 Code Words for Overhead Aluminum Elec-
Development of International Standards, Guides and Recom-
trical Conductors
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3. Classification
3.1 For the purpose of this specification, conductors are
2. Referenced Documents
classified as follows (Explanatory Note 1 and Note 2):
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
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.
1 3
This specification is under the jurisdiction of ASTM Committee B01 on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Conductors of Light Metals. Available from National Institute of Standards and Technology (NIST), 100
Current edition approved Oct. 1, 2023. Published October 2023. Originally Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
5
approved in 1948. Last previous edition approved in 2021 as B231/ Available from Aluminum Association, 1400 Crystal Dr., Suite 430, Arlington,
B231M – 16 (2021). DOI: 10.1520/B0231_B0231M-23. VA 22202, http://www.aluminum.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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...
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: B231/B231M − 16 (Reapproved 2021) B231/B231M − 23
Standard Specification for
1
Concentric-Lay-Stranded Aluminum 1350 Conductors
This standard is issued under the fixed designation B231/B231M; 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
3 1
1.1 This specification covers aluminum 1350-H19 (extra hard), 1350-H16 or -H26 ( ⁄4 hard), 1350-H14 or -H24 ( ⁄2 hard), and
1
1350-H142 or -H242 ( ⁄2 hard), bare concentric-lay-stranded conductors constructed with a straight round central wire surrounded
by one or more layers of helically layed wires. The conductors are for general use for electrical purposes (Explanatory Note 1 and
Note 2).
1.2 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.
1.2.1 For density, resistivity and temperature, the values stated in SI units are to be regarded as standard.
NOTE 1—Prior to 1975, aluminum 1350 was designated as EC aluminum.
NOTE 2—The aluminum and temper designations conform to ANSI Standard H35.1/H35.1M. Aluminum 1350 corresponds to Unified Numbering System
A91350 in accordance with Practice E527.
NOTE 3—Sealed conductors that are intended to prevent longitudinal water propagation and are further covered/insulated are also permitted within the
guidelines of this specification.
1.3 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
2.2 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor Materials
B230/B230M Specification for Aluminum 1350–H19 Wire for Electrical Purposes
1
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on Conductors
of Light Metals.
Current edition approved Oct. 1, 2021Oct. 1, 2023. Published October 2021October 2023. Originally approved in 1948. Last previous edition approved in 20162021 as
B231/B231M – 16.B231/B231M – 16 (2021). DOI: 10.1520/B0231_B0231M-16R21.10.1520/B0231_B0231M-23.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B231/B231M − 23
B263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors
B354 Terminology Relating to Uninsulated Metallic Electrical Conductors
B609/B609M Specification for Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical Purposes
B682 Specification for Standard Metric Sizes of Electrical Conductors
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
3
2.3 ANSI Documents:
ANSI H35.1 American National Standard Alloy and Temper Designation System for Aluminum
ANSI H35.1M American National Standard Alloy and Temper Designation Systems for Aluminum [Metric]
4
2.4 NIST Document:
NBS Handbook 100—Copper Wire Tables
5
2.5 Aluminum Association Document:
Publication 50 Code Words for Overhead Aluminum Electrical Conductors
3. Classification
3.1 For the purpose of this specification, conductors are classified as follows (Explanatory Note 1 and Note 2):
3.1.1 Class AA—For bare conductors usually used in overhead lines.
3.1.2 Class A—For conductors to be covered with weather-resistant materials, and for b
...
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