ASTM B857-09

This document is not anASTM standard and is intended only to provide the user of anASTM 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:B 857–02 Designation: B 857 – 09
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
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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 (´) indicates an editorial change since the last revision or reapproval.
1. 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. ForThe
values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered
standard.
1.2.1 Exceptions—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. 1.2.1ForFor 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.
2. Referenced Documents
2.1 The following documents of the issue in effect on date of material purchase form part of this specification to the extent
referenced herein:
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2.2 ASTM Standards:
B 232/B 232M Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Reinforced (ACSR)
B 263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors
B 341/B 341M Specification forAluminum-Coated (Aluminized) Steel Core Wire forAluminum Conductors, Steel Reinforced
(ACSR/AZ)
B 354 Terminology Relating to Uninsulated Metallic Electrical Conductors
B 498/B 498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Aluminum Conductors, Steel Reinforced
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(ACSR) Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
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B 500/B 500M Specification for Metallic Coated Stranded Steel Core for Aluminum Conductors, Steel Reinforced (ACSR)
Specification for Metallic Coated Stranded Steel Core for Use in Overhead Electrical Conductors
B 502 Specification for Aluminum-Clad Steel Core Wire for Aluminum Conductors, Aluminum-Clad Steel Reinforced
B 549 Specification for Concentric-Lay-Stranded Aluminum Conductors, Aluminum-Clad Steel Reinforced (ACSR/AW)
B 606 Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-Alloy
Conductors, Steel Reinforced
B 609/B 609M Specification for Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical Purposes
B 779 Specification for ShapedWire Compact Concentric-Lay-StrandedAluminum Conductors, Steel-Reinforced (ACSR/TW)
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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.
Current edition approved April 10, 2002. Published May 2002. Originally published as B857–95. Last previous edition B857–01a.
Current edition approved April 1, 2009. Published May 2009. Originally approved in 1995. Last previous edition approved in 2002 as B 857 – 02.
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For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Serv
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