ASTM B502-10

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 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 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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2010
• ICS: 29.060.10 - Wires
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.06 - Bi-Metallic Conductors

Relations

• Replaces: ASTM B502-02(2007) - Standard Specification for Aluminum-Clad Steel Core Wire for Aluminum Conductors, Aluminum-Clad Steel Reinforced
• Effective Date: 01-Apr-2010
• Replaced By: ASTM B502/B502M-10e1 - Standard Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
• Effective Date: 01-Apr-2010
• Referred By: ASTM B258-18 - Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors
• Effective Date: 01-Apr-2010
• Referred By: ASTM B193-20 - Standard Test Method for Resistivity of Electrical Conductor Materials
• Effective Date: 01-Apr-2010
• Referred By: ASTM B415-16(2021) - Standard Specification for Hard-Drawn Aluminum-Clad Steel Wire
• Effective Date: 01-Apr-2010

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:B502 −10
StandardSpecification for
Aluminum-Clad Steel Core Wire for Use in Overhead
1
Electrical Aluminum Conductors
This standard is issued under the fixed designation B502; 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 3.1.4 Package size: (see 17.1),
3.1.5 Special packaging and package marking if required
1.1 This specification covers round, aluminum-clad steel
(see 16.1), and
core wire with two designations of tensile strengths, AW2
3.1.6 Place of inspection if other than place of manufacture
(Normal Strength) and AW3 (High Strength).
(see 14.1).
1.2 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
4. Materials and Manufacture
each system may not be exact equivalents; therefore, each
4.1 The base metal shall be steel produced by the open-
system shall be used independently of the other. Combining
hearth, electric-furnace, or basic-oxygen process and shall be
values from the two systems may result in non-conformance
of such composition that the finished clad wire shall have the
with the standard.
properties and characteristics prescribed in this specification.
1.2.1 For conductor sizes designated by AWG, the require-
4.2 The aluminum used for cladding shall have a purity and
ments in SI units have been numerically converted from
quantity sufficient to meet thickness and resistance require-
correspondingvaluesstatedorderivedininch-poundunits.For
ments of this specification (see 7.1 and 9.1).
conductor sizes designated by SI units only, the requirements
are stated or derived in SI units.
5. Tensile Properties
2. Referenced Documents
5.1 Requirements—The aluminum-clad steel core wire shall
conform to the tensile requirements prescribed in Table 1 and
2.1 The following documents of the issue in effect on date
Table 2. Purchasers of core intended for use in conductor
of material purchase form a part of this specification to the
constructions with annealed aluminum wires, such as ACSS/
extent referenced herein.
AW3, ACSS/TW/AW3 may request the stranded steel core be
2
2.2 ASTM Standards:
compliant only with ultimate tensile strength and may waive
B193 Test Method for Resistivity of Electrical Conductor
compliance with the 1 % extension tensile requirement. This
Materials
use of the ultimate tensile requirement as an alternate to the 1
E8 Test Methods for Tension Testing of Metallic Materials
% extension requirement shall be by agreement between the
purchaser and producer and shall be noted on product compli-
3. Ordering Information
ance documentation. In computing stress at 1 % extension and
3.1 Orders for material under this specification shall include
ultimate tensile strength, the actual diameter of the finished
the following information:
wire shall be used.
3.1.1 Quantity of each size,
5.2 ElongationTest—The elongation shall be determined by
3.1.2 Wire size: diameter in inches (see 6.1),
an extensometer suitable for measuring elongation in 10.0 in.
3.1.3 Core Wire Strength, AW2 (Normal Strength) or AW3
(250 mm) and equipped with a vernier or other instrument
(High Strength) (see Table 1 and Table 2),
reading to 0.001 in. (0.025 mm). It shall be attached to the test
specimen at a load equal to the initial tensile stress shown in
1
This specification is under the jurisdiction of ASTM Committee B01 on
Table 3 and Table 4. At this load the extensometer shall be
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
adjusted to the initial setting shown in Table 3 and Table 4.
Composite Conductors.
Upon application of further load, the tension shall be read at an
Current edition approved April 1, 2010. Published May 2010. Originally
extensometer reading of 1.0 % to determine conformance with
approved in 1970. Last previous edition approved in 2007 as B502 – 02 (2007).
DOI: 10.1520/B0502-10.
therequirementinTable1andTable2.Furtherelongationshall
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
beobservedwhileapplyingatensionloadtothespecimen.The
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
elongation thus determined shall be not less than 1.5 % in 10.0
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in. (250 mm). A test in which the extensometer reading is less
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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B502−10
TABLE 1 Tensile Requirements for Normal Strength (
...

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:B502–02 (Reapproved 2007) Designation: B502 – 10
Standard Specification for
Aluminum-Clad Steel Core Wire for Aluminum Conductors,
Aluminum-Clad Steel ReinforcedAluminum-Clad Steel Core
1
Wire for Use in Overhead Electrical Aluminum Conductors
This standard is issued under the fixed designation B502; 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 used for mechanical reinforcement in the manufacture of
aluminum conductors, aluminum-clad steel reinforced.with two designations of tensile strengths, AW2 (Normal Strength) and
AW3 (High Strength).
1.2 The values stated in inch-pound either SI units or SIinch-pound units are to be regarded separately as the standard. Each
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 specification. Forstandard.
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.
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
E8 Test Methods for Tension Testing of Metallic Materials
3. Ordering Information
3.1 Orders for material under this specification shall include the following information:
3.1.1 Quantity of each size,
3.1.2 Wire size: diameter in inches (see 6.1)
3.1.3Package size: (see ),
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),
3.1.45 Special packaging and package marking if required (see 16.1), and
3.1.56 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 Table1.In
1
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on Composite
Conductors.
Current edition approved Oct. 1, 2007. Published October 2007. Originally approved in 1970. Last previous edition approved in 2002 as B502–02. DOI:
10.1520/B0502-02R07.
Current edition approved April 1, 2010. Published May 2010. Originally approved in 1970. Last previous edition approved in 2007 as B502 – 02 (2007). DOI:
10.1520/B0502-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book ofASTM 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 – 10
TABLE 1 Tensile Requirements for Normal Strength (AW2) For
ACSR/AW2, ACSR/TW/AW2 and ACSS/AW2, ACSR/TW/AW2 Type
Conductors
Nominal Stress at 1.0 % Ultimate Tensile Elongation,
Diameter, Extension min, Strength, min, min, %, 10 in.
in. (mm) psi (MPa) psi (MPa) (250 mm)
0.0770 to 0.1289 175 000 (1206) 195 000 (1344) 1.5
(1.956 to 3.274), incl
0.1290 to 0.1369 170 000 (1172) 190 000 (1310) 1.5
(3.275 to 3.477), incl
0.1370 to 0.1443 165 000 (1137) 185 000 (1275) 1.5
(3.478 to 3.665), incl
0.1444 to 0.1549 160 000 (1103) 180 000 (1241) 1.5
(3.666 to 3.934), incl
0.1550 to 0.1620 160 000 (1103) 175 000 (1206) 1.5
(3.935 to 4.115), incl
0.1621 to 0.1729 155 000 (1068) 170 000 (1172) 1.5
(4.116 to 4.392), i
...