ASTM B502/B502M-23
(Specification)Standard Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
Standard Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
ABSTRACT
This specification covers round, aluminum-clad steel core wire used for mechanical reinforcement in the manufacture of aluminum conductors, aluminum-clad steel reinforced. The base metal shall be steel produced by the openhearth, electric-furnace, or basic-oxygen process and shall be of such composition that the finished clad wire shall have the properties and characteristics prescribed in this specification. The aluminum used for cladding shall have a purity and quantity sufficient to meet thickness and resistance requirements of this specification. The material shall conform to the required tensile properties such as stress, tensile strength, and elongation. The aluminum-clad steel core shall undergo elongation test, tension test, and torsion test. The elongation test shall be determined by an extensometer equipped with a vernier or other instrument reading. In the torsion test, a small tensile load shall be applied to the specimen during testing. The specimen shall be twisted by rotating one of the vises in the same direction until fracture occurs.
SCOPE
1.1 This specification covers round, aluminum-clad steel core wire with two designations of tensile strengths, AW2 (Normal Strength) and AW3 (High Strength).
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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.2.1 For conductor sizes designated by AWG, 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.
1.3 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: B502/B502M − 23
Standard Specification for
Aluminum-Clad Steel Core Wire for Use in Overhead
1
Electrical Aluminum Conductors
This standard is issued under the fixed designation B502/B502M; 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.
1. Scope 3. Ordering Information
1.1 This specification covers round, aluminum-clad steel 3.1 Orders for material under this specification shall include
core wire with two designations of tensile strengths, AW2 the following information:
(Normal Strength) and AW3 (High Strength). 3.1.1 Quantity of each size,
3.1.2 Wire size: diameter in inches (see 6.1),
1.2 The values stated in either SI units or inch-pound units
3.1.3 Core Wire Strength, AW2 (Normal Strength) or AW3
are to be regarded separately as standard. The values stated in
(High Strength) (see Table 1 and Table 2),
each system are not necessarily exact equivalents; therefore, to
3.1.4 Package size: (see 17.1),
ensure conformance with the standard, each system shall be
3.1.5 Special packaging and package marking if required
used independently of the other, and values from the two
(see 16.1), and
systems shall not be combined.
3.1.6 Place of inspection if other than place of manufacture
1.2.1 For conductor sizes designated by AWG, the require-
(see 14.1).
ments in SI units have been numerically converted from
corresponding values stated or derived in inch-pound units. For
4. Materials and Manufacture
conductor sizes designated by SI units only, the requirements
4.1 The base metal shall be steel produced by the open-
are stated or derived in SI units.
hearth, electric-furnace, or basic-oxygen process and shall be
1.3 This international standard was developed in accor-
of such composition that the finished clad wire shall have the
dance with internationally recognized principles on standard-
properties and characteristics prescribed in this specification.
ization established in the Decision on Principles for the
4.2 The aluminum used for cladding shall have a purity and
Development of International Standards, Guides and Recom-
quantity sufficient to meet thickness and resistance require-
mendations issued by the World Trade Organization Technical
ments of this specification (see 7.1 and 9.1).
Barriers to Trade (TBT) Committee.
5. Tensile Properties
2. Referenced Documents
5.1 Requirements—The aluminum-clad steel core wire shall
2.1 The following documents of the issue in effect on date
conform to the tensile requirements prescribed in Table 1 and
of material purchase form a part of this specification to the
Table 2. In computing the stress at 1 % extension and comput-
extent referenced herein.
ing the ultimate tensile strength, the actual diameter of the
2
2.2 ASTM Standards: finished wire shall be used. Purchasers of core intended for use
in conductor constructions with annealed aluminum wires,
B193 Test Method for Resistivity of Electrical Conductor
Materials such as ACSS may request the stranded steel core be compliant
only with ultimate tensile strength and may waive compliance
E8/E8M Test Methods for Tension Testing of Metallic Ma-
terials with the 1 % extension tensile requirement. This use of the
ultimate tensile requirement as an alternate to the 1 %
extension requirement shall be by agreement between the
purchaser and producer and shall be noted on product compli-
1
This specification is under the jurisdiction of ASTM Committee B01 on
ance documentation. For the ACSS conductor, the individual
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
Bi-Metallic Conductors.
wires shall also meet a minimum actual breaking strength
Current edition approved Oct. 1, 2023. Published October 2023. Originally
requirement as calculated based on the minimum ultimate
approved in 1970. Last previous edition approved in 2019 as B502/B502M – 19.
tensile strength and the nominal wire diameter.
DOI: 10.1520/B0502_B0502M-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2 Elongation Test—The elongation shall be determined by
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
an extensometer suitable for measuring elongation in 10.0 in.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. [250 mm] and equipped with a vernier or other instrument
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959
...
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: B502/B502M − 19 B502/B502M − 23
Standard Specification for
Aluminum-Clad Steel Core Wire for Use in Overhead
1
Electrical Aluminum Conductors
This standard is issued under the fixed designation B502/B502M; 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.
1. Scope
1.1 This specification covers round, aluminum-clad steel core wire with two designations of tensile strengths, AW2 (Normal
Strength) and AW3 (High Strength).
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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.2.1 For conductor sizes designated by AWG, 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.
1.3 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
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
3. Ordering Information
3.1 Orders for material under this specification shall include the following information:
3.1.1 Quantity of each size,
1
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on Bi-Metallic
Conductors.
Current edition approved Oct. 1, 2019Oct. 1, 2023. Published October 2019October 2023. Originally approved in 1970. Last previous edition approved in 20172019 as
B502/B502M – 10 (2017).B502/B502M – 19. DOI: 10.1520/B0502_B0502M-19.10.1520/B0502_B0502M-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
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B502/B502M − 23
3.1.2 Wire size: diameter in inches (see 6.1),
3.1.3 Core Wire Strength, AW2 (Normal Strength) or AW3 (High Strength) (see Table 1 and Table 2),
3.1.4 Package size: (see 17.1),
3.1.5 Special packaging and package marking if required (see 16.1), and
3.1.6 Place of inspection if other than place of manufacture (see 14.1).
4. Materials and Manufacture
4.1 The base metal shall be steel produced by the open-hearth, electric-furnace, or basic-oxygen process and shall be of such
composition that the finished clad wire shall have the properties and characteristics prescribed in this specification.
4.2 The aluminum used for cladding shall have a purity and quantity sufficient to meet thickness and resistance requirements of
this specification (see 7.1 and 9.1).
5. Tensile Properties
5.1 Requirements—The aluminum-clad steel core wire shall conform to the tensile requirements prescribed in Table 1 and Table
2. In computing the stress at 1 % extension and computing the ultimate tensile strength, the actual diameter of the finished wire
shall be used. Purchasers of core intended for use in conductor constructions with annealed aluminum wires, such as ACSS may
request the stranded steel core be compliant only with ultimate tensile strength and may waive compliance with the 1 % extension
tensile requirement. This use of the ultimate tensile requirement as an alternate to the 1 % extension requirement shall be by
agreement between the purchaser and producer and shall be noted on product compliance documentation. For the ACSS conductor,
the individual wires shall also meet a mi
...
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