ASTM B857-22
(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 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
- Technical Committee
- B01 - Electrical Conductors
- Drafting Committee
- B01.07 - Conductors of Light Metals
Relations
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Oct-2023
- Effective Date
- 01-Oct-2023
- Effective Date
- 01-Oct-2023
- Refers
ASTM B1006-17(2023) - Standard Specification for Electrical Overhead Conductor Code Word Names - Effective Date
- 01-Oct-2023
- Effective Date
- 01-Oct-2023
- Effective Date
- 01-Oct-2023
- Effective Date
- 01-Jan-2020
- Effective Date
- 01-Oct-2019
- Effective Date
- 01-Apr-2017
- Effective Date
- 01-Apr-2017
- Effective Date
- 01-Dec-2016
- Effective Date
- 01-Dec-2016
- Effective Date
- 01-Oct-2016
Overview
ASTM B857-22 is the Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW). Published by ASTM International, this standard specifies requirements for ACSS/TW conductors used in overhead electrical transmission and distribution. ACSS/TW conductors are constructed using trapezoidal-shaped aluminum wires compactly stranded around a steel core, enhancing their efficiency for use as overhead conductors, especially where high strength and conductivity are essential.
The standard defines criteria concerning conductor construction, material properties, mechanical and electrical performance, and test methods. It contributes to reliability, consistency, and compatibility in specifying, manufacturing, and deploying ACSS/TW conductors worldwide.
Key Topics
Conductor Construction:
- Defines requirements for compact concentric-lay-stranded aluminum conductors using trapezoidal wire (TW) design.
- Specifies a central core of round, coated steel wires, surrounded by two or more layers of aluminum wires.
- Permits various classes and coatings of steel core wires, such as galvanized, aluminum-clad, or Zn-5% Al-MM alloy coated.
Material Properties:
- Aluminum wires must meet the requirements for O Temper in accordance with relevant ASTM standards.
- Steel core wires must comply with applicable ASTM specifications for strength and coating.
- Electrical resistivity, mechanical strength, and density values are identified to ensure standardized performance.
Performance Criteria:
- Rated conductor strength is determined by mechanical and electrical tests.
- Mass and diameter tolerances are specified for finished conductors.
- Requirements for welds and joints in aluminum wires are detailed to promote reliability.
Testing and Quality Assurance:
- Outlines test procedures for electrical resistivity, tensile strength, elongation, and overall conductor dimensions.
- Provides criteria for inspection, packaging, and marking to ensure traceability and quality control.
Applications
ACSS/TW conductors standardized by ASTM B857-22 are primarily used in:
- High-voltage Overhead Transmission Lines:
Their strength and compact design make them suitable for long spans, heavy loads, and challenging installations. - Power Distribution Systems:
Enhanced aluminum area for a given diameter improves current-carrying capabilities, supporting network efficiency. - Upgrades of Existing Infrastructure:
ACSS/TW enables capacity increases without major changes to tower or pole structures, leveraging backward compatibility with standard conductor types such as ACSR and ACSS. - Extreme Environmental Conditions:
The robust steel core and suitable coatings confer durability under high tensions, elevated temperatures, and adverse weather.
Related Standards
ASTM B857-22 references and aligns with several key standards for consistent performance and compatibility in the field of electrical conductors, including:
- ASTM B232/B232M: Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Reinforced (ACSR)
- ASTM B609/B609M: Aluminum 1350 Round Wire for Electrical Purposes
- ASTM B498/B498M: Zinc-Coated Steel Core Wire for Use in Overhead Conductors
- ASTM B500/B500M: Stranded Steel Core for Overhead Electrical Conductors
- ASTM B549, B606, B802, B803, B857, B958: Additional specifications for various core wire coatings and strengths
- ASTM B354: Terminology Relating to Uninsulated Metallic Electrical Conductors
These standards, together with ASTM B857-22, form a comprehensive foundation for specifying, manufacturing, and installing reliable, high-performance ACSS/TW aluminum conductors.
Keywords: aluminum conductors, shaped wire, concentric-lay stranded, steel supported, ACSS/TW, overhead electrical conductors, ASTM B857-22, power transmission, compact aluminum conductor, ACSS, ACSR.
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Frequently Asked Questions
ASTM B857-22 is a technical specification published by ASTM International. Its full title is "Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW)". This standard covers: 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.
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.
ASTM B857-22 is classified under the following ICS (International Classification for Standards) categories: 29.060.10 - Wires. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM B857-22 has the following relationships with other standards: It is inter standard links to ASTM B500/B500M-24, ASTM B232/B232M-24, ASTM B957/B957M-23, ASTM B606/B606M-23, ASTM B502/B502M-23, ASTM B1006-17(2023), ASTM B802/B802M-23, ASTM B958/B958M-23, ASTM B263/B263M-14(2020), ASTM B502/B502M-19, ASTM B502/B502M-10(2017), ASTM B1006-17, ASTM B957/B957M-16, ASTM B958/B958M-16, ASTM B803/B803M-08(2016). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM B857-22 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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
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 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)
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. 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 service@astm.org. 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
B857 − 22
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 16.3 18.2 19.1 14.2 14.8 0.69
477.0 13 Flicker/ACSS/TW 477.0 24/7 18 2 7 0.0940 612 13.0 14.2 15.7 16.4 12.5 13.0 0.78
477.0 16 Hawk/ACSS/TW 477.0 26/7 18 2 7 0.1053 655 15.6 17.1 18.9 19.8 14.9 15.6 0.79
477.0 23 Hen/ACSS/TW 477.0 30/7 17 2 7 0.1261 746 21.0 22.7 25.4 26.7 20.1 20.5 0.83
556.5 13 Parakeet/ACSS/TW 556.5 24/7 18 2 7 0.1015 714 15.2 16.6 18.3 19.1 14.6 15.2 0.84
556.5 16 Dove/ACSS/TW 556.5 26/7 20 2 7 0.1138 764 18.2 19.9 22.1 23.1 17.5 18.2 0.85
636.0 13 Rook/ACSS/TW 636.0 24/7 18 2 7 0.1085 818 17.3 19.0 20.9 21.9 16.7 17.3 0.89
636.0 16 Grosbeak/ACSS/TW 636.0 26/7 20 2 7 0.1216 873 20.7 22.4 24.8 26.0 19.9 20.3 0.91
795.0 7 Tern/ACSS/TW 795.0 45/7 17 2 7 0.0886 891 14.2 15.2 16.6 17.5 13.5 14.2 0.96
D D
795.0 10 Puffin /ACSS/TW 795.0 22/7 18 2 7 0.1108 974 18.9 20.6 22.6 23.7 18.3 18.9 0.98
795.0 13 Condor/ACSS/TW 795.0 54/7 20 2 7 0.1213 1020 21.7 23.3 25.7 26.9 20.9 21.3 0.99
795.0 16 Drake/ACSS/TW 795.0 26/7 20 2 7 0.1360 1091 25.9 28.0 31.0 32.5 24.4 25.4 1.01
795.0 23 Mallard/ACSS/TW 795.0 30/19 22 2 19 0.0977 1234 34.3 37.9 42.1 44.3 32.9 34.3 1.05
954.0 5 Phoenix/ACSS/TW 954.0 42/7 30 3 7 0.0837 1028 14.2 15.2 16.3 17.1 13.6 14.2 1.05
954.0 7 Rail/ACSS/TW 954.0 45/7 32 3 7 0.0971 1074 16.7 18.0 19.6 20.4 16.2 16.7 1.06
954.0 13 Cardinal/ACSS/TW 954.0 54/7 20 2 7 0.1329 1227 26.0 28.0 30.9 32.3 24.6 25.5 1.08
1033.5 5 Snowbird/ACSS/TW 1033.5 42/7 30 3 7 0.0871 1114 15.4 16.4 17.7 18.5 14.8 15.4 1.09
1033.5 7 Ortolan/ACSS/TW 1033.5 45/7 32 3 7 0.1010 1163 18.1 19.5 21.2 22.0 17.6 18.1 1.10
1033.5 13 Curlew/ACSS/TW 1033.5 54/7 21 2 7 0.1383 1326 28.2 30.3 33.4 35.0 26.1 27.7 1.13
1113.0 5 Avocet/ACSS/TW 1113.0 42/7 30 3 7 0.0904 1199 16.3 17.5 18.8 19.5 15.9 16.3 1.13
1113.0 7 Bluejay/ACSS/TW 1113.0 45/7 33 3 7 0.1049 1253 19.5 21.0 22.9 23.8 18.9 19.5 1.14
1113.0 13 Finch/ACSS/TW 1113.0 54/19 38 3 19 0.0862 1427 30.4 33.2 36.5 38.7 28.8 30.4 1.19
1192.5 5 Oxbird/ACSS/TW 1192.5 42/7 30 3 7 0.0936 1285 17.5 18.7 20.2 20.9 17.0 17.5 1.17
1192.5 7 Bunting/ACSS/TW 1192.5 45/7 33 3 7 0.1085 1342 20.9 22.5 24.5 25.5 20.3 20.9 1.18
1192.5 13 Grackle/ACSS/TW 1192.5 54/19 38 3 19 0.0892 1529 32.6 35.5 39.1 41.5 30.8 32.6 1.22
1272.0 5 Scissortail/ACSS/TW 1272.0 42/7 30 3 7 0.0967 1371 18.7 20.0 21.5 22.3 18.2 18.7 1.20
1272.0 7 Bittern/ACSS/TW 1272.0 45/7 35 3 7 0.1121 1432 22.3 24.0 26.1 27.2 21.6 22.3 1.22
1272.0 13 Pheasant/ACSS/TW 1272.0 54/19 39 3 19 0.0921 1630 34.1 37.3 41.1 43.0 32.8 34.1 1.26
1351.5 7 Dipper/ACSS/TW 1351.5 45/7 35 3 7 0.1155 1521 23.7 25.5 27.7 28.8 23.0 23.7 1.26
1351.5 13 Martin/ACSS/TW 1351.5 54/19 39 3 19 0.0949 1732 36.2 39.6 43.6 45.6 34.9 36.2 1.30
1431.0 7 Bobolink/ACSS/TW 1431.0 45/7 36 3 7 0.1189 1611 25.1 27.0 29.4 30.5 24.3 25.1 1.29
1431.0 13 Plover/ACSS/TW 1431.0 54/19 39 3 19 0.0977 1834 38.4 41.9 46.2 48.3 36.9 38.4 1.34
1590.0 7 Lapwing/ACSS/TW 1590.0 45/7 36 3 7 0.1253 1790 27.9 29.6 32.2 33.5 27.0 27.5 1.36
1590.0 13 Falcon/ACSS/TW 1590.0 54/19 42 3 19 0.1030 2038 42.6 46.6 51.3 53.7 41.1 42.6 1.41
1780.0 8 Chukar/ACSS/TW 1780.0 84/19 37 3 19 0.0874 2061 35.3 38.2 41.6 43.9 33.6 35.3 1.45
2156.0 8 Bluebird/ACSS/TW 2156.0 84/19 64 4 19 0.0961 2512 42.1 45.5 49.6 51.7 40.7 42.1 1.61
A
Conversion factors:
1 kcmil = 0.5067 mm
1 in. = 25.4 mm
1 lb ⁄1000 ft = 1.4882 kg ⁄km
1 ft = 0.3048 m
1 lb = 0.4536 kg
1 kip = 1000 lbf = 4.448 kN
B
Code Words shown in this column are obtained from Specification B1006. They are provided for information only.
C
See Explanatory Note 3.
D
For 795 kcmilType 10 (PuffinACSSTW) conductor the indicated 0.1108 in. steel wire size does not correspond with the concentric round wire 795 kcmil 22/7 PuffinACSS conductor.The round wire construction utilizes
a 0.1056 in. diameter steel core wire.The industry accepted dimension for the PuffinACSSTW steel wire is 0.1108 in.Technically this renders the construction as aType 11 conductor.The conductor mass, rated strength
and diameter values correspond to the 0.1108 in. diameter steel core.
B857 − 22
A
TABLE 2 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Supported
NOTE 1—Sized to have a diameter equal to a concentric round ACSR or ACSS, Class AA conductor.
Size and
Stranding
of ACSS Nominal Nominal
ACSS/TW Aluminum ACSS/TW Conductor Rated Strength
with Equal Steel Core Stranding Mass Outside
Conductor Size Stranding (by type of steel core wire)
Overall ACSS/TW Diameter
B
Conductor
Code Word
Diameter
Number Individual GAX Core
Number
of Number of Strand Wire lb/1000 ft GA2/MA2 GA3/MA3 GA4 / MA4 GA5 / MA5 AW2 AW3
C
kcmil Type kcmil Stranding of in.
Aluminum Wires Diameter, KIPS KIPS KIPS KIPS KIPS KIPS
Layers
Wires in.
571.7 13 Mohawk/ACSS/TW 477.0 24/7 18 2 7 0.1030 734 15.6 17.1 18.8 19.7 15.0 15.6 0.85
565.3 16 Calumet/ACSS/TW 477.0 26/7 20 2 7 0.1146 776 18.4 20.2 22.4 23.5 17.7 18.4 0.86
666.6 13 Mystic/ACSS/TW 556.5 24/7 20 2 7 0.1111 856 18.2 19.9 21.9 22.9 17.5 18.2 0.91
664.8 16 Oswego/ACSS/TW 556.5 26/7 20 2 7 0.1244 913 21.7 23.4 26.0 27.2 20.9 21.3 0.93
768.2 13 Maumee/ACSS/TW 636.0 24/7 20 2 7 0.1195 987 21.0 23.0 25.3 26.5 20.2 21.0 0.98
762.8 16 Wabash/ACSS/TW 636.0 26/7 20 2 7 0.1331 1047 24.9 26.8 29.7 31.2 23.4 24.4 0.99
957.2 7 Kettle/ACSS/TW 795.0 45/7 32 3 7 0.0973 1078 16.8 18.1 19.7 20.4 16.3 16.8 1.06
946.7 10 Fraser/ACSS/TW 795.0 22/7 35 3 7 0.1154 1140 21.1 22.9 25.1 26.2 20.3 21.1 1.08
966.2 13 Columbia/ACSS/TW 795.0 54/7 21 2 7 0.1338 1240 26.4 28.3 31.3 32.8 24.9 25.9 1.09
959.6 16 Suwannee/ACSS/TW 795.0 26/7 22 2 7 0.1493 1317 30.7 33.1 36.8 38.6 28.2 30.0 1.11
1080.0 7 . . . 900.0 45/7 20 2 7 0.1033 1211 18.9 20.4 22.2 23.1 18.4 18.9 1.13
1168.1 5 Cheyenne/ACSS/TW 954.0 42/7 30 3 7 0.0926 1259 17.2 18.3 19.7 20.4 16.7 17.1 1.16
1158.0 7 Genesee/ACSS/TW 954.0 45/7 33 3 7 0.1078 1307 20.5 22.1 24.0 25.0 19.9 20.5 1.17
1158.4 13 Hudson/ACSS/TW 954.0 54/7 25 2 7 0.1467 1488 31.1 33.5 37.0 38.8 28.7 30.5 1.20
1272.0 5 Catawba/ACSS/TW 1033.5 42/7 30 3 7 0.0967 1371 18.7 20.0 21.5 22.3 18.2 18.7 1.20
1257.1 7 Nelson/ACSS/TW 1033.5 45/7 35 3 7 0.1115 1416 22.1 23.8 25.8 26.9 21.4 22.1 1.21
1233.6 13 Yukon/ACSS/TW 1033.5 54/7 38 3 19 0.0910 1584 33.2 36.3 40.0 41.9 32.0 33.2 1.25
1372.5 5 Truckee/ACSS/TW 1113.0 42/7 30 3 7 0.1004 1479 20.2 21.5 23.2 24.0 19.6 20.2 1.25
1359.7 7 Mackenzie/ACSS/TW 1113.0 45/7 36 3 7 0.1159 1531 23.9 25.7 27.9 29.0 23.1 23.8 1.26
1334.6 13 Thames/ACSS/TW 1113.0 54/19 39 3 19 0.0944 1711 35.8 39.1 43.1 45.1 34.5 35.8 1.29
1467.8 5 St. Croix/ACSS/TW 1192.5 42/7 33 3 7 0.1041 1583 21.6 23.1 24.9 25.8 21.0 21.6 1.29
1455.3 7 Miramichi/ACSS/TW 1192.5 45/7 36 3 7 0.1200 1639 25.6 27.1 29.5 30.7 24.8 25.2 1.30
1433.6 13 Merrimack/ACSS/TW 1192.5 54/19 39 3 19 0.0978 1838 38.4 42.0 46.3 48.4 37.0 38.4 1.34
1569.0 5 Platte/ACSS/TW 1272.0 42/7 33 3 7 0.1074 1691 23.1 24.6 26.5 27.5 22.4 23.1 1.33
1557.4 7 Potomac/ACSS/TW 1272.0 45/7 36 3 7 0.1241 1754 27.3 29.0 31.6 32.8 26.5 26.9 1.35
1533.3 13 Rio Grande/ACSS/TW 1272.0 54/19 39 3 19 0.1012 1966 41.2 45.0 49.6 51.9 39.6 41.2 1.38
1657.4 7 Schuylkill/ACSS/TW 1351.5 45/7 36 3 7 0.1280 1866 29.1 30.9 33.6 34.9 28.2 28.6 1.39
1622.0 13 Pecos/ACSS/TW 1351.5 54/19 39 3 19 0.1064 2105 45.0 49.3 54.3 56.9 43.3 45.0 1.42
1758.6 7 Pee Dee/ACSS/TW 1431.0 45/7 37 3 7 0.1319 1980 30.9 32.8 35.7 37.1 29.4 30.4 1.43
1730.6 13 James/ACSS/TW 1431.0 54/19 39 3 19 0.1075 2219 46.4 50.8 55.9 58.5 44.7 46.4 1.47
1949.6 7 Athabaska/ACSS/TW 1590.0 45/7 42 3 7 0.1392 2197 34.3 36.5 39.3 40.8 31.7 33.5 1.50
1926.9 13 Cumberland/ACSS/TW 1590.0 54/19 42 3 19 0.1133 2469 51.6 56.4 62.2 65.0 49.7 51.6 1.55
2153.8 8 Powder/ACSS/TW 1780.0 84/19 64 4 19 0.0961 2510 42.1 45.5 49.6 51.7 40.7 42.1 1.60
2627.3 8 Santee/ACSS/TW 2156.0 84/19 64 4 19 0.1062 3063 51.3 55.6 60.6 63.1 49.7 51.3 1.76
A
Conversion factors:
1 kcmil = 0.5067 mm
1 in. = 25.4 mm
1 lb ⁄1000 ft = 1.4882 kg ⁄km
1 ft = 0.3048 m
1 lb = 0.4536 kg
1 kip = 1000 lbf = 4.448 kN
B
Code Words shown in this column are obtained from Specification B1006. They are provided for information only.
C
See Explanatory Note 3.
B857 − 22
TABLE 3 Comparison of ACSS/TW With Equivalent Stranding of
3.3.3 ACSS/TW/AW3—ACSS using high-strength
A B
ACSR and ACSS
aluminum-clad core wires in accordance with Specification
C D
ACSS/TW Type Number Conventional ACSR and ACSS Stranding
B502/B502M.
5 42/7
3.3.4 ACSS/TW/GA2—ACSS using Class A zinc-coated
7 45/7
8 84/19
regular strength steel core wires in accordance with Specifica-
10 22/7
tion B498/B498M.
13 54/7
13 24/7
3.3.5 ACSS/TW/GA3—ACSS using Class A zinc-coated
16 26/7
high-strength steel core wires in accordance with Specification
23 30/7
B606/B606M.
23 30/19
A
The equivalent stranding is that stranding of conventional ACSR that has the 3.3.6 ACSS/TW/GA4—ACSS using Class A zinc-coated
same area of aluminum and steel as a given ACSS/TW type.
extra-high-strength steel core wires in accordance with Speci-
B
The equivalent stranding is that stranding of conventional ACSS that has the
fication B957/B957M.
same area of aluminum and steel as a given ACSS/TW type.
C
ACSS ⁄TW type number is the approximate ratio of the steel area to the
3.3.7 ACSS/TW/GA5—ACSS using Class A zinc-coated
aluminum area in percent.
D ultra-high-strength steel core wires in accordance with Speci-
See Specifications B232/B232M and B856.
fication B957/B957M.
3.3.8 ACSS/TW/GC2—ACSS using Class C zinc-coated
regular strength steel core wires in accordance with Specifica-
B957/B957M Specification for Extra-High-Strength and
tion B498/B498M.
Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core
3.3.9 ACSS/TW/MA2—ACSS using Class A Zn-5A1-MM
Wire for Overhead Electrical Conductors
coated regular strength steel core wires in accordance with
B958/B958M Specification for Extra-High-Strength and
Specification B802/B802M.
Ultra-High-Strength Class A Zinc–5% Aluminum-
3.3.10 ACSS/TW/MA3—ACSS using Class A Zn-5A1-MM
Mischmetal Alloy-Coated Steel Core Wire for Use in
coated high-strength steel core wires in accordance with
Overhead Electrical Conductors
Specification B803/B803M.
B1006 Specification for Electrical Overhead Conductor
Code Word Names
3.3.11 ACSS/TW/MA4—ACSS using Class A Zn-5A1-MM
E29 Practice for Using Significant Digits in Test Data to
coated extra-high-strength steel core wires in accordance with
Determine Conformance with Specifications
Specification B958/B958M.
E527 Practice for Numbering Metals and Alloys in the
3.3.12 ACSS/TW/MA5—ACSS using Class A Zn-5A1-MM
Unified Numbering System (UNS)
coated ultra-high-strength steel core wires in accordance with
2.3 Other Standards:
Specification B958/B958M.
NBS Handbook 100 — Copper Wire Tables of the National
Bureau of Standards
4. Ordering Information
Aluminum Association Publication 50 Code Words for
4.1 Orders for material under this specification shall include
Overhead Aluminum Electrical Conductors
the following information:
4.1.1 Quantity of each size,
3. Terminology
4.1.2 Conductor size, kcmil area and diameter,
3.1 Definitions—For definitions of terms relating to
4.1.3 Conductor type and number of wires, aluminum and
conductors, also refer to definitions found in Specification
steel, (Table 1 and Table 2),
B354.
4.1.4 Type of steel core wire and class (if applicable) of
3.2 Definitions of Terms Specific to This Standard: coating (see 5.2),
3.2.1 aluminum-clad—aluminum bonded. 4.1.5 Direction of lay of outer layer of aluminum wires if
other than right-hand (see 7.6),
3.2.2 galvanized—zinc coated.
4.1.6 Special tension test, if desired (see 14.3),
3.2.3 Zn-5A1-MM—zinc-5 % aluminum-mischmetal alloy
4.1.7 Package size and type (see 16.1),
coated.
4.1.8 Special package markings, if required (see 16.4),
3.3 Abbreviations:
4.1.9 Heavy wood lagging, if requ
...
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
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 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
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.
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
B857 − 22
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 16.3 18.2 19.1 14.2 14.8 0.69
477.0 13 Flicker/ACSS/TW 477.0 24/7 18 2 7 0.0940 612 13.0 14.2 15.7 16.4 12.5 13.0 0.78
477.0 16 Hawk/ACSS/TW 477.0 26/7 18 2 7 0.1053 655 15.6 17.1 18.9 19.8 14.9 15.6 0.79
477.0 23 Hen/ACSS/TW 477.0 30/7 17 2 7 0.1261 746 21.0 22.7 25.4 26.7 20.1 20.5 0.83
556.5 13 Parakeet/ACSS/TW 556.5 24/7 18 2 7 0.1015 714 15.2 16.6 18.3 19.1 14.6 15.2 0.84
556.5 16 Dove/ACSS/TW 556.5 26/7 20 2 7 0.1138 764 18.2 19.9 22.1 23.1 17.5 18.2 0.85
636.0 13 Rook/ACSS/TW 636.0 24/7 18 2 7 0.1085 818 17.3 19.0 20.9 21.9 16.7 17.3 0.89
636.0 16 Grosbeak/ACSS/TW 636.0 26/7 20 2 7 0.1216 873 20.7 22.4 24.8 26.0 19.9 20.3 0.91
795.0 7 Tern/ACSS/TW 795.0 45/7 17 2 7 0.0886 891 14.2 15.2 16.6 17.5 13.5 14.2 0.96
D D
795.0 10 Puffin /ACSS/TW 795.0 22/7 18 2 7 0.1108 974 18.9 20.6 22.6 23.7 18.3 18.9 0.98
795.0 13 Condor/ACSS/TW 795.0 54/7 20 2 7 0.1213 1020 21.7 23.3 25.7 26.9 20.9 21.3 0.99
795.0 16 Drake/ACSS/TW 795.0 26/7 20 2 7 0.1360 1091 25.9 28.0 31.0 32.5 24.4 25.4 1.01
795.0 23 Mallard/ACSS/TW 795.0 30/19 22 2 19 0.0977 1234 34.3 37.9 42.1 44.3 32.9 34.3 1.05
954.0 5 Phoenix/ACSS/TW 954.0 42/7 30 3 7 0.0837 1028 14.2 15.2 16.3 17.1 13.6 14.2 1.05
954.0 7 Rail/ACSS/TW 954.0 45/7 32 3 7 0.0971 1074 16.7 18.0 19.6 20.4 16.2 16.7 1.06
954.0 13 Cardinal/ACSS/TW 954.0 54/7 20 2 7 0.1329 1227 26.0 28.0 30.9 32.3 24.6 25.5 1.08
1033.5 5 Snowbird/ACSS/TW 1033.5 42/7 30 3 7 0.0871 1114 15.4 16.4 17.7 18.5 14.8 15.4 1.09
1033.5 7 Ortolan/ACSS/TW 1033.5 45/7 32 3 7 0.1010 1163 18.1 19.5 21.2 22.0 17.6 18.1 1.10
1033.5 13 Curlew/ACSS/TW 1033.5 54/7 21 2 7 0.1383 1326 28.2 30.3 33.4 35.0 26.1 27.7 1.13
1113.0 5 Avocet/ACSS/TW 1113.0 42/7 30 3 7 0.0904 1199 16.3 17.5 18.8 19.5 15.9 16.3 1.13
1113.0 7 Bluejay/ACSS/TW 1113.0 45/7 33 3 7 0.1049 1253 19.5 21.0 22.9 23.8 18.9 19.5 1.14
1113.0 13 Finch/ACSS/TW 1113.0 54/19 38 3 19 0.0862 1427 30.4 33.2 36.5 38.7 28.8 30.4 1.19
1192.5 5 Oxbird/ACSS/TW 1192.5 42/7 30 3 7 0.0936 1285 17.5 18.7 20.2 20.9 17.0 17.5 1.17
1192.5 7 Bunting/ACSS/TW 1192.5 45/7 33 3 7 0.1085 1342 20.9 22.5 24.5 25.5 20.3 20.9 1.18
1192.5 13 Grackle/ACSS/TW 1192.5 54/19 38 3 19 0.0892 1529 32.6 35.5 39.1 41.5 30.8 32.6 1.22
1272.0 5 Scissortail/ACSS/TW 1272.0 42/7 30 3 7 0.0967 1371 18.7 20.0 21.5 22.3 18.2 18.7 1.20
1272.0 7 Bittern/ACSS/TW 1272.0 45/7 35 3 7 0.1121 1432 22.3 24.0 26.1 27.2 21.6 22.3 1.22
1272.0 13 Pheasant/ACSS/TW 1272.0 54/19 39 3 19 0.0921 1630 34.1 37.3 41.1 43.0 32.8 34.1 1.26
1351.5 7 Dipper/ACSS/TW 1351.5 45/7 35 3 7 0.1155 1521 23.7 25.5 27.7 28.8 23.0 23.7 1.26
1351.5 13 Martin/ACSS/TW 1351.5 54/19 39 3 19 0.0949 1732 36.2 39.6 43.6 45.6 34.9 36.2 1.30
1431.0 7 Bobolink/ACSS/TW 1431.0 45/7 36 3 7 0.1189 1611 25.1 27.0 29.4 30.5 24.3 25.1 1.29
1431.0 13 Plover/ACSS/TW 1431.0 54/19 39 3 19 0.0977 1834 38.4 41.9 46.2 48.3 36.9 38.4 1.34
1590.0 7 Lapwing/ACSS/TW 1590.0 45/7 36 3 7 0.1253 1790 27.9 29.6 32.2 33.5 27.0 27.5 1.36
1590.0 13 Falcon/ACSS/TW 1590.0 54/19 42 3 19 0.1030 2038 42.6 46.6 51.3 53.7 41.1 42.6 1.41
1780.0 8 Chukar/ACSS/TW 1780.0 84/19 37 3 19 0.0874 2061 35.3 38.2 41.6 43.9 33.6 35.3 1.45
2156.0 8 Bluebird/ACSS/TW 2156.0 84/19 64 4 19 0.0961 2512 42.1 45.5 49.6 51.7 40.7 42.1 1.61
A
Conversion factors:
2 32
1 cmil = 5.067E−04 mm 1 kcmil = 0.5067 (0.0005067 mm )
1 in. = 2.54E+01 mm (25.4 mm) 1 in. = 25.4 mm
1 lb ⁄1000ft = 1.488 kg⁄1000 ft = 1.4882 kg ⁄km
1 ft = 3.048E−01 m (0.3048 1 ft = 0.3048 m
m) 1 lb = 0.4536 kg
1 lb = 4.536E−01 kg
(0.4536 kg) 1 kip
1 lbf = 4.448E−03 kN (0.0044448 kN) = 1000 lbf = 4.448 kN
B
Code Words shown in this column are obtained from Specification B1006. They are provided for information only.
C
See Explanatory Note 43.
B857 − 22
D
For 795 kcmil Type 10 (Puffin ACSS TW) conductor the indicated 0.1108 in. steel wire size does not correspond with the concentric round wire 795 kcmil 22/7 Puffin ACSS conductor. The round wire construction utilizes
a 0.1056 in. diameter steel core wire. The industry accepted dimension for the Puffin ACSS TW steel wire is 0.1108 in. Technically this renders the construction as a Type 11 conductor. The conductor mass, rated strength
and diameter values correspond to the 0.1108 in. diameter steel core.
B857 − 22
A
TABLE 2 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Supported
NOTE 1—Sized to have a diameter equal to a concentric round ACSR or ACSS, Class AA conductor.
Size and
Stranding
of ACSS Nominal Nominal
ACSS/TW Aluminum ACSS/TW Conductor Rated Strength
with Equal Steel Core Stranding Mass Outside
Conductor Size Stranding (by type of steel core wire)
Overall ACSS/TW Diameter
B
Conductor
Code Word
Diameter
Number Individual GAX Core
Number
of Number of Strand Wire lb/1000 ft GA2/MA2 GA3/MA3 GA4 / MA4 GA5 / MA5 AW2 AW3
C
kcmil Type kcmil Stranding of in.
Aluminum Wires Diameter, KIPS KIPS KIPS KIPS KIPS KIPS
Layers
Wires in.
571.7 13 Mohawk/ACSS/TW 477.0 24/7 18 2 7 0.1030 734 15.6 17.1 18.8 19.7 15.0 15.6 0.85
565.3 16 Calumet/ACSS/TW 477.0 26/7 20 2 7 0.1146 776 18.4 20.2 22.4 23.5 17.7 18.4 0.86
666.6 13 Mystic/ACSS/TW 556.5 24/7 20 2 7 0.1111 856 18.2 19.9 21.9 22.9 17.5 18.2 0.91
664.8 16 Oswego/ACSS/TW 556.5 26/7 20 2 7 0.1244 913 21.7 23.4 26.0 27.2 20.9 21.3 0.93
768.2 13 Maumee/ACSS/TW 636.0 24/7 20 2 7 0.1195 987 21.0 23.0 25.3 26.5 20.2 21.0 0.98
762.8 16 Wabash/ACSS/TW 636.0 26/7 20 2 7 0.1331 1047 24.9 26.8 29.7 31.2 23.4 24.4 0.99
957.2 7 Kettle/ACSS/TW 795.0 45/7 32 3 7 0.0973 1078 16.8 18.1 19.7 20.4 16.3 16.8 1.06
946.7 10 Fraser/ACSS/TW 795.0 22/7 35 3 7 0.1154 1140 21.1 22.9 25.1 26.2 20.3 21.1 1.08
966.2 13 Columbia/ACSS/TW 795.0 54/7 21 2 7 0.1338 1240 26.4 28.3 31.3 32.8 24.9 25.9 1.09
959.6 16 Suwannee/ACSS/TW 795.0 26/7 22 2 7 0.1493 1317 30.7 33.1 36.8 38.6 28.2 30.0 1.11
1080.0 7 . . . 900.0 45/7 20 2 7 0.1033 1211 18.9 20.4 22.2 23.1 18.4 18.9 1.13
1168.1 5 Cheyenne/ACSS/TW 954.0 42/7 30 3 7 0.0926 1259 17.2 18.3 19.7 20.4 16.7 17.1 1.16
1158.0 7 Genesee/ACSS/TW 954.0 45/7 33 3 7 0.1078 1307 20.5 22.1 24.0 25.0 19.9 20.5 1.17
1158.4 13 Hudson/ACSS/TW 954.0 54/7 25 2 7 0.1467 1488 31.1 33.5 37.0 38.8 28.7 30.5 1.20
1272.0 5 Catawba/ACSS/TW 1033.5 42/7 30 3 7 0.0967 1371 18.7 20.0 21.5 22.3 18.2 18.7 1.20
1257.1 7 Nelson/ACSS/TW 1033.5 45/7 35 3 7 0.1115 1416 22.1 23.8 25.8 26.9 21.4 22.1 1.21
1233.6 13 Yukon/ACSS/TW 1033.5 54/7 38 3 19 0.0910 1584 33.2 36.3 40.0 41.9 32.0 33.2 1.25
1372.5 5 Truckee/ACSS/TW 1113.0 42/7 30 3 7 0.1004 1479 20.2 21.5 23.2 24.0 19.6 20.2 1.25
1359.7 7 Mackenzie/ACSS/TW 1113.0 45/7 36 3 7 0.1159 1531 23.9 25.7 27.9 29.0 23.1 23.8 1.26
1334.6 13 Thames/ACSS/TW 1113.0 54/19 39 3 19 0.0944 1711 35.8 39.1 43.1 45.1 34.5 35.8 1.29
1467.8 5 St. Croix/ACSS/TW 1192.5 42/7 33 3 7 0.1041 1583 21.6 23.1 24.9 25.8 21.0 21.6 1.29
1455.3 7 Miramichi/ACSS/TW 1192.5 45/7 36 3 7 0.1200 1639 25.6 27.1 29.5 30.7 24.8 25.2 1.30
1433.6 13 Merrimack/ACSS/TW 1192.5 54/19 39 3 19 0.0978 1838 38.4 42.0 46.3 48.4 37.0 38.4 1.34
1569.0 5 Platte/ACSS/TW 1272.0 42/7 33 3 7 0.1074 1691 23.1 24.6 26.5 27.5 22.4 23.1 1.33
1557.4 7 Potomac/ACSS/TW 1272.0 45/7 36 3 7 0.1241 1754 27.3 29.0 31.6 32.8 26.5 26.9 1.35
1533.3 13 Rio Grande/ACSS/TW 1272.0 54/19 39 3 19 0.1012 1966 41.2 45.0 49.6 51.9 39.6 41.2 1.38
1657.4 7 Schuylkill/ACSS/TW 1351.5 45/7 36 3 7 0.1280 1866 29.1 30.9 33.6 34.9 28.2 28.6 1.39
1622.0 13 Pecos/ACSS/TW 1351.5 54/19 39 3 19 0.1064 2105 45.0 49.3 54.3 56.9 43.3 45.0 1.42
1758.6 7 Pee Dee/ACSS/TW 1431.0 45/7 37 3 7 0.1319 1980 30.9 32.8 35.7 37.1 29.4 30.4 1.43
1730.6 13 James/ACSS/TW 1431.0 54/19 39 3 19 0.1075 2219 46.4 50.8 55.9 58.5 44.7 46.4 1.47
1949.6 7 Athabaska/ACSS/TW 1590.0 45/7 42 3 7 0.1392 2197 34.3 36.5 39.3 40.8 31.7 33.5 1.50
1926.9 13 Cumberland/ACSS/TW 1590.0 54/19 42 3 19 0.1133 2469 51.6 56.4 62.2 65.0 49.7 51.6 1.55
2153.8 8 Powder/ACSS/TW 1780.0 84/19 64 4 19 0.0961 2510 42.1 45.5 49.6 51.7 40.7 42.1 1.60
2627.3 8 Santee/ACSS/TW 2156.0 84/19 64 4 19 0.1062 3063 51.3 55.6 60.6 63.1 49.7 51.3 1.76
A
Conversion factors:
2 2
1 cmil = 5.067E−04 mm 1 kcmil = 0.5067 (0.0005067 mm )
1 in. = 2.54E+01 mm (25.4 mm) 1 in. = 25.4 mm
1 lb ⁄1000 ft = 1.488 kgft = 1.4882 kg ⁄km
1 ft = 3.048E−01 m (0.3048 m) 1 ft = 0.3048 m
1 lb = 4.536E−01 kg (0.4536 kg) 1 lb = 0.4536 kg
1 lbf = 4.448E−03 kN (0.004448 kN) 1 kip = 1000 lbf = 4.448 kN
B
Code Words shown in this column are obtained from Specification B1006. They are provided for information only.
C
See Explanatory Note 43.
B857 − 22
TABLE 3 Comparison of ACSS/TW With Equivalent Stranding of
A B
ACSR and ACSS
C D
ACSS/TW Type Number Conventional ACSR and ACSS Stranding
5 42/7
7 45/7
8 84/19
10 22/7
13 54/7
13 24/7
16 26/7
23 30/7
23 30/19
A
The equivalent stranding is that stranding of conventional ACSR that has the
same area of aluminum and steel as a given ACSS/TW type.
B
The equivalent stranding is that stranding of conventional ACSS that has the
same area of aluminum and steel as a given ACSS/TW type.
C
ACSS ⁄TW type number is the approximate ratio of the steel area to the
aluminum area in percent.
D
See Specifications B549B232/B232M and B856.
B354 Terminology Relating to Uninsulated Metallic Electrical Conductors
B498/B498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
B500/B500M Specification for Metallic Coated or Aluminum Clad Stranded Steel Core for Use in Overhead Electrical
Conductors
B502B502/B502M Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
B549 Specification for Concentric-Lay-Stranded Aluminum Conductors, Aluminum-Clad Steel Reinforced for Use in Overhead
Electrical Conductors
B606B606/B606M Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-
Alloy Conductors, Steel Reinforced
B609/B609M Specification for Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical Purposes
B802/B802M Specification for Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors,
Steel Reinforced (ACSR)
B803B803/B803M Specification for High-Strength Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in
Overhead Electrical Conductors
B856 Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Supported (ACSS)
B957B957/B957M Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire
for Overhead Electrical Conductors
B958B958/B958M Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc–5% Aluminum-Mischmetal
Alloy-Coated Steel Core Wire for Use in Overhead Electrical Conductors
B1006 Specification for Electrical Overhead Conductor Code Word Names
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.3 Other Standards:
NBS Handbook 100 — Copper Wire Tables of the National Bureau of Standards
Aluminum Association Publication 50 Code Words for Overhead Aluminum Electrical Conductors
3. Terminology
3.1 Definitions—For definitions of terms relating to conductors, also refer to definitions found in Specification B354.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 aluminum-clad—aluminum bonded.
3.2.2 galvanized—zinc coated.
3.2.3 Zn-5A1-MM—zinc-5 % aluminum-mischmetal alloy coated.
3.3 Abbreviations:
Available from National Technical Information Service (NTIS), 5301 Shawnee Rd., Alexandria, VA 22312, http://www.ntis.gov.
Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600, Arlington, VA 22209, http://www.aluminum.org.
B857 − 22
3.3.1 ACSS/TW—shaped wire aluminum conductor, steel supported.
3.3.2 ACSS/TW/AW2—supported withACSS using regular strength aluminum-clad core wires in accordance with Specification
B502B502/B502M.
3.3.3 ACSS/TW/AW3—supported withACSS using high-strength aluminum-clad core wires in accordance with Specification
B502B502/B502M.
3.3.4 ACSS/TW/GA2—ACSS using Class A zinc-coated regular strength steel core wires in accordance with Specification
B498/B498M.
3.3.5 ACSS/TW/GA3—ACSS using Class A zinc-coated high-strength steel core wires in accordance with Specification
B606B606/B606M.
3.3.6 ACSS/TW/GA4—ACSS using Class A zinc-coated extra-high-strength steel core wires in accordance with Specification
B957B957/B957M.
3.3.7 ACSS/TW/GA5—ACSS using Class A zinc-coated ultra-high-strength steel core wires in accordance with Specification
B957B957/B957M.
3.3.8 ACSS/TW/GC2—ACSS using Class C zinc-coated regular strength steel core wires in accordance with Specification
B498/B498M.
3.3.9 ACSS/TW/MA2—ACSS using Class A Zn-5A1-MM coated regular strength steel core wires in accordance with Specification
B802/B802M.
3.3.10 ACSS/TW/MA3—ACSS using Class A Zn-5A1-MM coated high strength high-strength steel core wires in accordance with
Specification B803B803/B803M.
3.3.11 ACSS/TW/MA4—ACSS using Class A Zn-5A1-MM coated extra-high-strength steel core wires in accordance with
Specification B958B958/B958M.
3.3.12 ACSS/TW/MA5—ACSS using Class A Zn-5A1-MM coated ultra-high-strength steel core wires in accordance with
Specification B958B958/B958M.
4. Ordering Information
4.1 Orders for material under this specification shall include the following information:
4.1.1 Quantity of each size,
4.1.2 Conductor size, kcmil area and diameter,
4.1.3 Conductor type and number of wires, aluminum and steel, (Table 1 and Table 2),
4.1.4 Type of steel core wire and class (if applicable) of coating (see 5.2),
4.1.5 Direction of lay of outer layer of aluminum wires if other than right-hand (see 7.77.6),
4.1.6 Special tension test, if desired (see 14.3),
4.1.7 Package size and type (see 16.1),
4.1.8 Special package markings, if required (see 16.4),
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4.1.9 Heavy wood lagging, if required (see 16.3), and
4.1.10 Place of inspection (see Section 15).
5. Requirement for Wires
5.1 After stranding, the
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