ASTM B857-22

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 units are to be regarded as standard. The 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 designated by SI units only, the requirements are stated or derived in SI units. 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), or to reduce the diameter for a given area of aluminum. 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.  
1.4 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.

General Information

• Status: Published
• Publication Date: 30-Nov-2022
• ICS: 29.060.10 - Wires
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.07 - Conductors of Light Metals

Standards Content (Sample)

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.
Designation: B857 −22
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 B857; 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 mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers shaped wire compact
concentric-lay-stranded aluminum conductors, steel supported
2. Referenced Documents
(ACSS/TW) for use as overhead electrical conductors (see
2.1 The following documents of the issue in effect on date
Explanatory Note 1).
ofmaterialpurchaseformpartofthisspecificationtotheextent
1.2 The values stated in inch-pound units are to be regarded
referenced herein:
as standard. The values given in parentheses are mathematical
2
2.2 ASTM Standards:
conversions to SI units that are provided for information only
B232/B232M Specification for Concentric-Lay-Stranded
and are not considered standard.
Aluminum Conductors, Coated-Steel Reinforced (ACSR)
1.2.1 Exceptions—For conductor sizes designated by AWG
B263/B263M Test Method for Determination of Cross-
or kcmil sizes, the requirements in SI units are numerically
Sectional Area of Stranded Conductors
converted from the corresponding requirements in inch-pound
B354 Terminology Relating to Uninsulated Metallic Electri-
units. For conductor sizes designated by SI units only, the
cal Conductors
requirements are stated or derived in SI units. For density,
B498/B498M Specification for Zinc-Coated (Galvanized)
resistivity, and temperature, the values stated in SI units are to
Steel Core Wire for Use in Overhead Electrical Conduc-
be regarded as standard.
tors
1.3 ACSS/TWisdesignedtoincreasethealuminumareafor
B500/B500M Specification for Metallic Coated or Alumi-
a given diameter of conductor by the use of trapezoidal shaped
num Clad Stranded Steel Core for Use in Overhead
wires (TW), or to reduce the diameter for a given area of
Electrical Conductors
aluminum. The conductors consist of a central core of round
B502/B502M Specification for Aluminum-Clad Steel Core
steel wire(s) surrounded by two or more layers of trapezoidal
Wire for Use in Overhead Electrical Aluminum Conduc-
aluminum 1350-0 wires. Different strandings of the same size
tors
of conductor are identified by type, which is the approximate
B606/B606M Specification for High-Strength Zinc-Coated
ratio of steel area to aluminum area expressed in percent (see
(Galvanized) Steel Core Wire for Aluminum and
Table 1, Table 2 and Table 3). For the purpose of this
Aluminum-Alloy Conductors, Steel Reinforced
specification, the sizes listed in Table 1 and Table 2 are
B609/B609M Specification for Aluminum 1350 Round
tabulated on the basis of the finished conductor having an area
Wire, Annealed and Intermediate Tempers, for Electrical
or outside diameter equal to that of specified sizes of standard
Purposes
ACSR, ACSS, and ACSR/TW so as to facilitate conductor
B802/B802M Specification for Zinc–5 % Aluminum-
selection.
Mischmetal Alloy-Coated Steel Core Wire for Aluminum
1.4 This international standard was developed in accor- Conductors, Steel Reinforced (ACSR)
dance with internationally recognized principles on standard- B803/B803M Specification for High-Strength Zinc–5 %
ization established in the Decision on Principles for the Aluminum-Mischmetal Alloy-Coated Steel Core Wire for
Development of International Standards, Guides and Recom- Use in Overhead Electrical Conductors
B856 Specification for Concentric-Lay-Stranded Aluminum
Conductors, Coated Steel Supported (ACSS)
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on
2
Conductors of Light Metals. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2022. Published January 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1995. Last previous edition approved in 2018 as B857 – 18. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0857-22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B857 − 22
2
A
TABLE 1 Construction Requirements for Shape
...

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: B857 − 18 B857 − 22
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 B857; 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 units are to be regarded as standard. The 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 designated by SI units only, the requirements are
stated or derived in SI units. 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), or to reduce the diameter for a given area of aluminum. 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 1Table 1,, Table
2 Table 2 and Table 3Table 3). ). For the purpose of this specification, the sizes listed in TableTable 1 1 and TableTable 2 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.
1.4 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 part of this specification to the extent
referenced herein:
2
2.2 ASTM Standards:
B232/B232M Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Reinforced (ACSR)
B263B263/B263M Test Method for Determination of Cross-Sectional Area of Stranded Conductors
1
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on Conductors
of Light Metals.
Current edition approved March 1, 2018Dec. 1, 2022. Published March 2018January 2023. Originally approved in 1995. Last previous edition approved in 20142018 as
B857 – 14.B857 – 18. DOI: 10.1520/B0857-18.10.1520/B0857-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
1

---------------------- Page: 1 ----------------------
B857 − 22
2
A
TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Supported
NOTE 1—Sized to have area equal aluminum cross-sectional area to an ACSR or ACSS, Class AA conductor.
Size and Stranding
Nominal
ACSS/TW of ACSS Aluminum Steel Core Nominal Mass ACSS/TW Conductor Rated Strength
Outside
Conductor Size with Equal Aluminum Stranding Stranding ACSS/TW (by type of steel core wire)
Diameter
Cross-Sectional Area
B
Code Word
Individual
Number
Number Number Strand GA2 / GA3 / GA4 / GA5 /
Strand- of GAX Core AW2 AW3
C
kcmil Type kcmil of of Wire MA2 MA3 MA4 MA5 in.
ing Aluminum lb/1000 ft KIPS KIPS
Layers Wires Diameter, KIPS KIPS KIPS KIPS
Wires
in.
266.8 16 Partridge/ACSS/TW 266.8 26/7 18 2 7 0.0788 349 8.90 9.70 10.8 11.4 8.40 8.90 0.58
336.4 23 Oriole/ACSS/TW 336.4 30/7 17 2 7 0.1059 526 14.8
...