ASTM B857-02
(Specification)Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW)
Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW)
ABSTRACT
This specification covers shaped wire compact concentric-lay-stranded aluminum conductors, steel supported (ACSS/TW) for use as overhead electrical conductors. Electric-butt welds, cold-pressure welds, and electric-butt, cold upsed welds in the finished individual aluminum wires composing the conductor may be made during the stranding process. The electrical resistivity of the material shall meet the minimum resistivity specified. The rated strength of the completed conductor may be determined by mechanical tests. Mass and density of the conductors shall be determined.
SCOPE
1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductors, steel supported (ACSS/TW) for use as overhead electrical conductors (see Explanatory Note 1).
1.2 The values stated in inch-pound or SI units are to be regarded separately as standard. Each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification. For conductor sizes designated by AWG or kcmil sizes, the requirements in SI units are numerically converted from the corresponding requirements in inch-pound units. For conductor sizes designation by AWG or kcmil, 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.
1.2.1 For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.
1.3 ACSS/TW is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidal shaped wires (TW). The conductors consist of a central core of round steel wire(s) surrounded by two or more layers of trapezoidal aluminum 1350-0 wires. Different strandings of the same size of conductor are identified by type, which is the approximate ratio of steel area to aluminum area expressed in percent (see Table 1, Table 2, and Table 3 ). For the purpose of this specification, the sizes listed in Table 1 and Table 2 are tabulated on the basis of the finished conductor having an area or outside diameter equal to that of specified sizes of standard ACSR, ACSS, and ACSR/TW so as to facilitate conductor selection.
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Designation: B 857 – 02
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
1
Conductors, Coated-Steel Supported (ACSS/TW)
This standard is issued under the fixed designation B 857; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 ASTM Standards:
B 232 Specification for Concentric-Lay-Stranded Alumi-
1.1 This specification covers shaped wire compact
2
num Conductors, Coated Steel Reinforced (ACSR)
concentric-lay-stranded aluminum conductors, steel supported
B 263 Test Method for Determination of Cross-Sectional
(ACSS/TW) for use as overhead electrical conductors (see
2
Area of Stranded Conductors
Explanatory Note 1).
B 341/B 341M Specification for Aluminum-Coated (Alu-
1.2 The values stated in inch-pound or SI units are to be
minized) Steel Core Wire forAluminum Conductors, Steel
regarded separately as standard. Each system shall be used
2
Reinforced (ACSR/AZ)
independently of the other. Combining values from the two
B 354 Terminology Relating to Uninsulated Metallic Elec-
systems may result in non-conformance with the specification.
2
trical Conductors
For conductor sizes designated by AWG or kcmil sizes, the
B 498/B 498M Specification for Zinc-Coated (Galvanized)
requirements in SI units are numerically converted from the
Steel Core Wire for Aluminum Conductors, Steel Rein-
correspondingrequirementsininch-poundunits.Forconductor
2
forced (ACSR)
sizes designation by AWG or kcmil, the requirements in SI
B 500/B 500M Specification for Metallic Coated Stranded
units have been numerically converted from corresponding
Steel Core for Aluminum Conductors, Steel Reinforced
values stated or derived in inch-pound units. For conductor
2
(ACSR)
sizesdesignatedbySIunitsonly,therequirementsarestatedor
B 502 SpecificationforAluminum-CladSteelCoreWirefor
derived in SI units.
2
Aluminum Conductors,Aluminum-Clad Steel Reinforced
1.2.1 For density, resistivity, and temperature, the values
B 549 Specification for Concentric-Lay-Stranded Alumi-
stated in SI units are to be regarded as standard.
num Conductors, Aluminum-Clad Steel Reinforced
1.3 ACSS/TWisdesignedtoincreasethealuminumareafor
2
(ACSR/AW)
a given diameter of conductor by the use of trapezoidal shaped
B 606 Specification for High-Strength Zinc-Coated (Galva-
wires (TW). The conductors consist of a central core of round
nized) Steel Core Wire for Aluminum and Aluminum-
steel wire(s) surrounded by two or more layers of trapezoidal
2
Alloy Conductors, Steel Reinforced
aluminum 1350-0 wires. Different strandings of the same size
B 609/B 609M Specification for Aluminum 1350 Round
of conductor are identified by type, which is the approximate
Wire, Annealed and Intermediate Tempers, for Electrical
ratio of steel area to aluminum area expressed in percent (see
2
Purposes
Table 1, Table 2, and Table 3). For the purpose of this
B 779 Specification for Shaped Wire Compact Concentric-
specification, the sizes listed in Table 1 and Table 2 are
Lay-Stranded Aluminum Conductors, Steel-Reinforced
tabulated on the basis of the finished conductor having an area
2
(ACSR/TW)
or outside diameter equal to that of specified sizes of standard
B 802/B 802M Specification for Zinc-5 % Aluminum-
ACSR, ACSS, and ACSR/TW so as to facilitate conductor
Mischmetal Alloy-Coated Steel Core Wire for Aluminum
selection.
2
Conductors, Steel-Reinforced (ACSR)
2. Referenced Documents
B 803 Specification for High-Strength Zinc-5 %
Aluminum-Mischmetal Alloy-Coated Steel Core Wire for
2.1 The following documents of the issue in effect on date
Aluminum and Aluminum-Alloy Conductors, Steel-
ofmaterialpurchaseformpartofthisspecificationtotheextent
2
Reinforced
referenced herein:
E 29 Practice for Using Significant Digits in Test Data to
3
Determine Conformance with Specifications
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.07
Conductors of Light Metals.
2
Current edition approved April 10, 2002. Published May 2002. Originally Annual Book of ASTM Standards, Vol 02.03.
3
published as B 857 – 95. Last previous edition B 857 – 01a. Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B 857–02
TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel
A
Supported
NOTE 1—Sized to have area equal to ACSR or ACSS, Class AA.
Size and Stranding
ACSS/TW Aluminum Rated Streng
...
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