ASTM B779-22

Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)

ABSTRACT
This specification covers shaped wire compact concentric-lay-stranded aluminum conductor, steel-reinforced (ACSR/TW) and its component wires for use as overhead electrical conductors. Requirements for (1) wire stranding (2) tensile strength and elongation, (3) joints such as electric-butt welds, electric-butt cold-upset welds, or cold-pressure welds, and (4) lay length, diameter, direction, and factor are detailed. The construction requirements include: nominal aluminum cross sectional area, conductor type, nominal number of aluminum wires, number of layers, number and diameter of the steel core wire, mass per unit length, rated strength, and outside diameter of the shaped wire compact. The methods of determining mass per unit length, cross-section, and electrical resistance of the stranded conductor are given. Mechanical and electrical tests shall be performed before stranding.
SCOPE
1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductor, steel-reinforced (ACSR/TW) and its component wires for use as overhead electrical conductors (Explanatory Note 1 and Note 2).  
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.
Note 1: ACSR/TW is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidally 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-H19 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 (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 specific sizes of standard ACSR so as to facilitate conductor selection.
Note 2: The aluminum and temper designations conform to ANSI Standard H 35.1. Aluminum 1350 corresponds to Unified Numbering System (UNS) A91350 in accordance with Practice E527.    
1.3 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: 29.240.20 - Power transmission and distribution lines
• 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: B779 −22
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
1
Conductors, Steel-Reinforced (ACSR/TW)
This standard is issued under the fixed designation B779; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope B232/B232M Specification for Concentric-Lay-Stranded
Aluminum Conductors, Coated-Steel Reinforced (ACSR)
1.1 This specification covers shaped wire compact
B263/B263MTest Method for Determination of Cross-
concentric-lay-stranded aluminum conductor, steel-reinforced
Sectional Area of Stranded Conductors
(ACSR/TW) and its component wires for use as overhead
B354Terminology Relating to Uninsulated Metallic Electri-
electrical conductors (Explanatory Note 1 and Note 2).
cal Conductors
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
B498/B498MSpecification for Zinc-Coated (Galvanized)
as standard. The values given in parentheses are mathematical
Steel Core Wire for Use in Overhead Electrical Conduc-
conversions to SI units that are provided for information only
tors
and are not considered standard.
B500/B500MSpecification for Metallic Coated or Alumi-
num Clad Stranded Steel Core for Use in Overhead
NOTE 1—ACSR/TW is designed to increase the aluminum area for a
given diameter of conductor by the use of trapezoidally shaped wires Electrical Conductors
(TW). The conductors consist of a central core of round steel wire(s)
B502/B502MSpecification for Aluminum-Clad Steel Core
surrounded by two or more layers of trapezoidal aluminum 1350-H19
Wire for Use in Overhead Electrical Aluminum Conduc-
wires. Different strandings of the same size of conductor are identified by
tors
type, which is the approximate ratio of steel area to aluminum area
B606/B606MSpecification for High-Strength Zinc-Coated
expressedinpercent(Table1,Table2andTable3).Forthepurposeofthis
specification, the sizes listed in Table 1 and Table 2 are tabulated on the
(Galvanized) Steel Core Wire for Aluminum and
basisofthefinishedconductorhavinganareaoroutsidediameterequalto
Aluminum-Alloy Conductors, Steel Reinforced
that of specific sizes of standard ACSR so as to facilitate conductor
B802/B802M Specification for Zinc–5 % Aluminum-
selection.
MischmetalAlloy-Coated Steel Core Wire forAluminum
NOTE 2—The aluminum and temper designations conform to ANSI
Standard H35.1. Aluminum 1350 corresponds to Unified Numbering Conductors, Steel Reinforced (ACSR)
System (UNS) A91350 in accordance with Practice E527.
B803/B803M Specification for High-Strength Zinc–5 %
Aluminum-MischmetalAlloy-Coated Steel Core Wire for
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard- Use in Overhead Electrical Conductors
B1006Specification for Electrical Overhead Conductor
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- Code Word Names
E29Practice for Using Significant Digits in Test Data to
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. Determine Conformance with Specifications
E527Practice for Numbering Metals and Alloys in the
2. Referenced Documents
Unified Numbering System (UNS)
2
2.2 Other Documents:
2.1 ASTM Standards:
ANSIH35.1AmericanNationalStandardAlloyandTemper
B230/B230MSpecification for Aluminum 1350–H19 Wire
3
Designation Systems for Aluminum
for Electrical Purposes
NBS Handbook 100— Copper Wire Tables of the National
4
Bureau of Standards
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on
3. Terminology
Conductors of Light Metals.
3.1 Definitions of Terms Specific to This Standard:
Current edition approved Dec. 1, 2022. Published January 2023. Originally
approved in 1987. Last previous edition approved in 2018 as B779– 18. DOI:
10.1520/B0779-22.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from National Technical Information Service (NTIS), 5285 Port
the ASTM website. Royal Rd., Springfield, VA 22161, http://www.ntis.gov.
Copyright © ASTM International, 100 Barr Harbor Drive,
...

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: B779 − 18 B779 − 22
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
1
Conductors, Steel-Reinforced (ACSR/TW)
This standard is issued under the fixed designation B779; 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 conductor, steel-reinforced (ACSR/TW) and
its component wires for use as overhead electrical conductors (Explanatory Note 1 and Note 2).
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.
NOTE 1—ACSR/TW is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidally 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-H19 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 (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 specific sizes of standard ACSR so as to facilitate conductor selection.
NOTE 2—The aluminum and temper designations conform to ANSI Standard H 35.1. Aluminum 1350 corresponds to Unified Numbering System (UNS)
A91350 in accordance with Practice E527.
1.3 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
2.1 ASTM Standards:
B230/B230M Specification for Aluminum 1350–H19 Wire for Electrical Purposes
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
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
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 1987. Last previous edition approved in 20142018 as
B779 – 14.18. DOI: 10.1520/B0779-18.10.1520/B0779-22.
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

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B779 − 22
2
TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Reinforced Size to Have Area Equal to ACSR,
Class AA
ACSR/TW Conductor Size and Stranding of ACSR with
A
Mass per
Code Word Steel Core Stranding
Number of Rated Nominal
Size Equal Area
Number of
Unit
Aluminum Strength, Outside
B
Layers
Number of Diameter, Length, C E
D
Wires 1000 lb Diameter, in.
kcmil Type kcmil Stranding
lb/1000 ft
Wires in.
Merlin TW 336.4 6 336.4 18/1 14 2 1 0.1367 365 8.6 0.63
Flicker TW 477.0 13 477.0 24/7 18 2 7 0.0940 613 17.2 0.78
Hawk TW 477.0 16 477.0 26/7 18 2 7 0.1053 655 19.4 0.79
Parakeet TW 556.5 13 556.5 24/7 18 2 7 0.1
...