ASTM B502/B502M-10(2017)
(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 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.
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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Designation:B502/B502M −10 (Reapproved 2017)
Standard Specification for
Aluminum-Clad Steel Core Wire for Use in Overhead
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
3.1 Orders for material under this specification shall include
1.1 This specification covers round, aluminum-clad steel
the following information:
core wire with two designations of tensile strengths, AW2
3.1.1 Quantity of each size,
(Normal Strength) and AW3 (High Strength).
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 may not be exact equivalents; therefore, each
3.1.4 Package size: (see 17.1),
system shall be used independently of the other. Combining
3.1.5 Special packaging and package marking if required
values from the two systems may result in non-conformance
(see 16.1), and
with the standard.
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
4. Materials and Manufacture
correspondingvaluesstatedorderivedininch-poundunits.For
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
of such composition that the finished clad wire shall have the
1.3 This international standard was developed in accor-
properties and characteristics prescribed in this specification.
dance with internationally recognized principles on standard-
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
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 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-
ance documentation. In computing stress at 1 % extension and
ultimate tensile strength, the actual diameter of the finished
This specification is under the jurisdiction of ASTM Committee B01 on
wire shall be used.
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
Bi-Metallic Conductors.
5.2 ElongationTest—The elongation shall be determined by
Current edition approved April 1, 2017. Published April 2017. Originally
ɛ2
an extensometer suitable for measuring elongation in 10.0 in.
approved in 1970. Last previous edition approved in 2010 as B502/B502M – 10 .
DOI: 10.1520/B0502_B0502M-10R17.
[250 mm] and equipped with a vernier or other instrument
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
reading to 0.001 in. [0.025 mm]. It shall be attached to the test
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
specimen at a load equal to the initial tensile stress shown in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Table 3 and Table 4. At this load the extensometer shall be
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B502/B502M−10 (2017)
TABLE 1 Tensile Requirements for Normal Strength (AW2) For
elongation thus determined shall be not less than 1.5 % in 10.0
ACSR/AW2, ACSR/TW/AW2 and ACSS/AW2, ACSR/TW/AW2 Type
in. [250 mm]. A test in which the extensometer reading is less
Conductors
than 1.5 % shall be disregarded if the fracture occurs less than
Nominal Stress at 1.0 % Ultimate Tensile Elongation,
1.0 in. [25 mm] from either attachment. In this case, another
Diameter, Extension min, Strength, min, min, %, 10 in.
specimen from the same reel or coil shall be tested.
in. [mm] psi (MPa) psi (MPa) [250 mm]
0.0770 to 0.1289 175 000 (1206) 195 000 (1344) 1.5
5.3 The tension tests shall be made in accordance with Test
[1.956 to 3.274], incl
Methods E8. The method for determining elongation is de-
0.1290 to 0.1369 170 000 (1172) 190 000 (1310) 1.5
[3.275 to 3.477], incl scribed in the Procedures Section of Test Methods E8.
0.1370 to 0.1443 165 000 (1137) 185 000 (1275) 1.5
[3.478 to 3.665], incl
6. Dimensions and Permissible Variations
0.1444 to 0.1549 160 000 (1103) 180 000 (1241) 1.5
[3.666 to 3.934], incl
6.1 The size shall be expressed by the wire diameter in
0.1550 to 0.1620 160 000 (1103) 175 000 (1206) 1.5
decimals of an inch to the nearest 0.0001 in. [0.003 mm].
[3.935 to 4.115], incl
0.1621 to 0.1729 155 000 (1068) 170 000 (1172) 1.5
6.2 Within the range of diameters included in Table 5 the
[4.116 to 4.392], incl
wireshallnotvaryfromthenominaldiameterbymorethanthe
0.1730 to 0.1819 150 000 (1034) 165 000 (1137) 1.5
[4.393 to 4.620], incl amounts shown in this table. In computing permissible
0.1820 to 0.1880 145 000 (1000) 160 000 (1103) 1.5
variations, diameters shall be rounded to the nearest 0.0001 in.
[4.621 to 4.775], incl
[0.003 mm].
6.3 If accessible, one measurement shall be taken near each
TABLE 2 Tensile Requirements for High Strength (AW3) For
end and one near the middle of the coil or reel. In the case of
ACSS/AW3 and ACSS/TW/AW3 Type Conductors
reels, the center and one end may not be accessible and the
Nominal Stress at 1.0 % Ultimate Tensile Elongation,
prescribed measurement shall be taken along the length of the
Diameter, Extension min, Strength, min, min, %, 10 in.
accessible material. If any of the selected coils or reels fail to
in. [mm] psi (MPa) psi (MPa) [250 mm]
conform to the requirements as prescribed in 6.2, all coils or
0.0770 to 0.0899 190 000 (1310) 210 000 (1450) 1.5
[1.956 to 2.283], incl reels shall be measured in the manner specified.
0.0900 to 0.1199 185 000 (1280) 205 000 (1410) 1.5
[2.284 to 3.045], incl
7. Thickness of Aluminum
0.1200 to 0.1399 180 000 (1240) 200 000 (1380) 1.5
[3.046 to 3.553], incl
7.1 The aluminum thickness at any point shall be not less
0.1400 to 0.1880 170 000 (1170) 195 000 (1340) 1.5
than 10 % of the nominal wire radius. Measurements shall be
[3.554 to 4.775], incl
read to the nearest 0.001 in. [0.03 mm]. In determining the
required or measured thickness, fractions of 0.0005 in. [0.013
mm] or less shall be dropped and for fractions of
...
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.
´2
Designation: B502/B502M − 10 B502/B502M − 10 (Reapproved 2017)
Standard Specification for
Aluminum-Clad Steel Core Wire for Use in Overhead
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.
ε NOTE—Designation was corrected editorially in October 2013.
ε NOTE—Editorial corrections were made in Section 9.1 in January 2016.
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 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.
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 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),
3.1.3 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.
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 April 1, 2010April 1, 2017. Published May 2010April 2017. Originally approved in 1970. Last previous edition approved in 20072010 as
ɛ2
B502 – 02B502/B502M – 10 (2007). . DOI: 10.1520/B0502_B0502M-10E02.10.1520/B0502_B0502M-10R17.
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
B502/B502M − 10 (2017)
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], incl
0.1730 to 0.1819 150 000 (1034) 165 000 (1137) 1.5
[4.393 to 4.620], incl
0.1820 to 0.1880 145 000 (1000) 160 000 (1103) 1.5
[4.621 to 4.775], incl
TABLE 2 Tensile Requirements for High Strength (AW3) For
ACSS/AW3 and ACSS/TW/AW3 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 0.0899 190 000 (1310) 210 000 (1450) 1.5
[1.956 to 2.283], incl
0.0900 to 0.1199 185 000 (1280) 205 000 (1410) 1.5
[2.284 to 3.045], incl
0.1200 to 0.1399 180 000 (1240) 200 000 (1380) 1.5
[3.046 to 3.553], incl
0.1400 to 0.1880 170 000 (1170) 195 000 (1340) 1.5
[3.554 to 4.775], incl
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. Purchasers of core intended for use in conductor constructions with annealed aluminum wires, such as ACSS/AW3,
ACSS/TW/AW3 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.
In computing stress at 1 % extension and ultimate tensile strength, the actual diameter of the finished wire shall be used.
5.2 Elongation Test—The elongation shall be determined by an extensometer suitable for measuring elongation in 10.0 in. [250
mm] and equipped with a vernier or other instrument 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 Table 3 and Table 4. At this load the extensometer shall be adjusted to the initial
setting shown in Table 3 and Table 4. Upon application of further load, the tension shall be read at an extensometer reading of
1.0 % to determine conformance with the requirement in Table 1 and Table 2. Further elongation shall be observed while applying
TABLE 3 Initial Settings for Determining at 1 % Extension for
Normal Strength (AW2)
Initial Setting of
Nominal Diameter, Initial Stress,
Extensometer,
in. [mm] psi (MPa)
% in./in. [cm/cm]
0.0770 to 0.0999 11 800 (81) 0.0005 (0.05 % extension)
[1.956 to 2.537], incl
0.1000 to 0.1299 23 500 (162) 0.0010 (0.10 % extension)
[2.538 to 3.299], incl
0.1300 to 0.1880 35 300 (243) 0.0015 (0.15 % extension)
[3.300 to 4.775], incl
B502/B502M − 10 (2017)
TABLE 4 Initial Settings for Determining at 1 % Extension for
High Strength (AW3)
Initial Setting of
Nominal Diameter, Initial Stress,
Extensometer,
in. [mm] psi (MPa)
% in./in. [cm/cm]
0.0770 to 0.0899 14 000 (100) 0.0005 (0.05 % extension)
[1.96 to 2.283], incl
0.0900 to 0.1199 28 000 (190) 0.0010 (0.10 % extension)
[2.284 to 3.045], incl
0.1200 to 0.1880 42 000 (290) 0.0015 (0.15 % extension)
[3.046 to 4.775], incl
a tension load to the specimen. The elongation thus determined shall be not less than 1.5 % in 10.0 in. [250 mm]. A test in which
the extensometer reading is less than 1.5 % shall be disregarded if the fracture occurs less tha
...
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