ASTM B502-02(2007)
(Specification)Standard Specification for Aluminum-Clad Steel Core Wire for Aluminum Conductors, Aluminum-Clad Steel Reinforced
Standard Specification for Aluminum-Clad Steel Core Wire for Aluminum Conductors, Aluminum-Clad Steel Reinforced
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 used for mechanical reinforcement in the manufacture of aluminum conductors, aluminum-clad steel reinforced.
1.2 The values stated in inch-pound or SI units are to be regarded separately as the standard. Each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: B502 – 02 (Reapproved 2007)
Standard Specification for
Aluminum-Clad Steel Core Wire for Aluminum Conductors,
Aluminum-Clad Steel Reinforced
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 4. Materials and Manufacture
1.1 This specification covers round, aluminum-clad steel 4.1 The base metal shall be steel produced by the open-
core wire used for mechanical reinforcement in the manufac- hearth, electric-furnace, or basic-oxygen process and shall be
ture of aluminum conductors, aluminum-clad steel reinforced. of such composition that the finished clad wire shall have the
1.2 The values stated in inch-pound or SI units are to be properties and characteristics prescribed in this specification.
regarded separately as the standard. Each system shall be used 4.2 The aluminum used for cladding shall have a purity and
independently of the other. Combining values from the two quantity sufficient to meet thickness and resistance require-
systems may result in nonconformance with the specification. ments of this specification (see 7.1 and 9.1).
ForconductorsizesdesignatedbyAWG,therequirementsinSI
5. Tensile Properties
units have been numerically converted from corresponding
5.1 Requirements—The aluminum-clad steel core wire shall
values stated or derived in inch-pound units. For conductor
sizesdesignatedbySI units only, the requirements arestatedor conform to the tensile requirements prescribed in Table 1.In
computingstressat1 %extensionandultimatetensilestrength,
derived in SI units.
the actual diameter of the finished wire shall be used.
2. Referenced Documents
5.2 ElongationTest—Theelongationshallbedeterminedby
2.1 The following documents of the issue in effect on date an extensometer suitable for measuring elongation in 10.0 in.
of material purchase form a part of this specification to the (250 mm) and equipped with a vernier or other instrument
extent referenced herein. reading to 0.001 in. (0.025 mm). It shall be attached to the test
2.2 ASTM Standards: specimen at a load equal to the initial tensile stress shown in
B193 Test Method for Resistivity of Electrical Conductor Table 2. At this load the extensometer shall be adjusted to the
Materials initial setting shown in Table 2. Upon application of further
E8 Test Methods for Tension Testing of Metallic Materials load, the tension shall be read at an extensometer reading of
1.0 % to determine conformance with the requirement in Table
3. Ordering Information
1. Further elongation shall be observed while applying a
3.1 Orders for material under this specification shall include
tension load to the specimen. The elongation thus determined
the following information: shall be not less than 1.5 % in 10.0 in. (250 mm). A test in
3.1.1 Quantity of each size,
which the extensometer reading is less than 1.5 % shall be
3.1.2 Wire size: diameter in inches (see 6.1) disregarded if the fracture occurs less than 1.0 in. (25 mm)
3.1.3 Package size: (see 17.1),
from either attachment. In this case, another specimen from the
3.1.4 Special packaging and package marking if required same reel or coil shall be tested.
(see 16.1), and
5.3 The tension tests shall be made in accordance with Test
3.1.5 Place of inspection if other than place of manufacture Methods E8. The method for determining elongation is de-
(see 14.1).
scribed in the Procedures Section of Test Methods E8.
6. Dimensions and Permissible Variations
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on 6.1 The size shall be expressed by the wire diameter in
Composite Conductors.
decimals of an inch to the nearest 0.0001 in. (0.003 mm).
Current edition approved Oct. 1, 2007. Published October 2007. Originally
6.2 Within the range of diameters included in Table 3 the
approved in 1970. Last previous edition approved in 2002 as B502 – 02. DOI:
wireshallnotvaryfromthenominaldiameterbymorethanthe
10.1520/B0502-02R07.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or amounts shown in this table. In computing permissible varia-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tions, diameters shall be rounded to the nearest 0.0001 in.
Standards volume information, refer to the standard’s Document Summary page on
(0.003 mm).
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B502 – 02 (2007)
TABLE 1 Tensile Requirements
8. Density
Nominal Stress at 1.0 % Ultimate Tensile Elongation,
8.1 For the purpose of calculating mass, cross sections, etc.,
Diameter, Extension min, Strength, min, min, %, 10 in.
the density of the wire shall be taken as 0.2381 lb/in. (6.590
in. (mm) psi (MPa) psi (MPa) (250 mm)
g/cm ) at 20°C.
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
9. Resistance
(3.275 to 3.477), incl
9.1 The electrical resistance of the wire shall be determined
0.1370 to 0.1443 165 000 (1137) 185 000 (1275) 1.5
(3.478 to 3.665), incl
by resistance measurements and maximum allowable resis-
0.1444 to 0.1549 160 000 (1103) 180 000 (1241) 1.5
tance shall be based on the nominal diameter of the wire and
(3.666 to 3.934), incl
the resistivity value of 51.01V· cmil/ft (0.08480 V·mm /m) at
0.1550 to 0.1620 160 000 (1103) 175 000 (1206) 1.5
(3.935 to 4.115), incl
20°C. Electrical resistance is calculated by the following
0.1621 to 0.1729 155 000 (1068) 170 000 (1172) 1.5
equations:
(4.116 to 4.392), incl
0.1730 to 0.1819 150 000 (1034) 165 000 (1137) 1.5
Resistance ~V/ft!5 R/S (1)
(4.393 to 4.620), incl
0.1820 to 0.1880 145 000 (1000) 160 000 (1103) 1.5
where:
(4.621 to 4.775), incl
R = resistivity, r·c mil/ft, and
S = nominal diameter, mils
or,
TABLE 2 Initial Settings for Determining at 1 % Extension
Resistance ~V/m!5 R/C (2)
Initial Setting of
Nominal Diameter, Initial Stress,
Extensometer,
in. (mm) psi (MPa)
% in./in. (cm/cm) where:
R = resistivity, r·mm /m, and
0.0770 to 0.0999 11 800 (81) 0.0005 (0.05 % extension)
C = nomimal cross section,
...
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