ASTM B779-14

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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2014
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.07 - Conductors of Light Metals

Relations

• Replaces: ASTM B779-12 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
• Effective Date: 01-Apr-2014
• Referred By: ASTM B1006-17 - Standard Specification for Electrical Overhead Conductor Code Word Names
• Effective Date: 01-Apr-2014

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B779 −14
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 B498/B498MSpecification for Zinc-Coated (Galvanized)
Steel Core Wire for Use in Overhead Electrical Conduc-
1.1 This specification covers shaped wire compact
tors
concentric-lay-stranded aluminum conductor, steel-reinforced
B500/B500MSpecification for Metallic Coated or Alumi-
(ACSR/TW) and its component wires for use as overhead
num Clad Stranded Steel Core for Use in Overhead
electrical conductors (Explanatory Note 1 and Note 2).
Electrical Conductors
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
B502Specification forAluminum-Clad Steel Core Wire for
as standard. The values given in parentheses are mathematical
Use in Overhead Electrical Aluminum Conductors
conversions to SI units that are provided for information only
B549Specification for Concentric-Lay-Stranded Aluminum
and are not considered standard.
Conductors, Aluminum-Clad Steel Reinforced for Use in
Overhead Electrical Conductors
NOTE 1—ACSR/TW is designed to increase the aluminum area for a
given diameter of conductor by the use of trapezoidally shaped wires B606Specification for High-Strength Zinc-Coated (Galva-
(TW). The conductors consist of a central core of round steel wire(s)
nized) Steel Core Wire for Aluminum and Aluminum-
surrounded by two or more layers of trapezoidal aluminum 1350-H19
Alloy Conductors, Steel Reinforced
wires. Different strandings of the same size of conductor are identified by
B802/B802M Specification for Zinc–5 % Aluminum-
type, which is the approximate ratio of steel area to aluminum area
MischmetalAlloy-Coated Steel Core Wire forAluminum
expressedinpercent(Table1,Table2andTable3).Forthepurposeofthis
specification, the sizes listed in Table 1 and Table 2 are tabulated on the
Conductors, Steel Reinforced (ACSR)
basisofthefinishedconductorhavinganareaoroutsidediameterequalto
B803Specification for High-Strength Zinc–5 %Aluminum-
that of specific sizes of standard ACSR so as to facilitate conductor
Mischmetal Alloy-Coated Steel Core Wire for Use in
selection.
Overhead Electrical Conductors
NOTE 2—The aluminum and temper designations conform to ANSI
Standard H35.1. Aluminum 1350 corresponds to Unified Numbering E29Practice for Using Significant Digits in Test Data to
System (UNS) A91350 in accordance with Practice E527.
Determine Conformance with Specifications
E527Practice for Numbering Metals and Alloys in the
2. Referenced Documents
Unified Numbering System (UNS)
2
2.1 ASTM Standards:
2.2 Other Documents:
B230/B230MSpecification for Aluminum 1350–H19 Wire ANSIH35.1AmericanNationalStandardAlloyandTemper
3
for Electrical Purposes
Designation Systems for Aluminum
B232/B232M Specification for Concentric-Lay-Stranded NBS Handbook 100— Copper Wire Tables of the National
4
Aluminum Conductors, Coated-Steel Reinforced (ACSR)
Bureau of Standards
B263Test Method for Determination of Cross-Sectional
3. Terminology
Area of Stranded Conductors
B354Terminology Relating to Uninsulated Metallic Electri-
3.1 Definitions of Terms Specific to This Standard:
cal Conductors
3.1.1 ACSR/TWcoveredbythisspecificationhasfivetypes
of coated core wire and one type of aluminum-clad core wire
whicharedesignatedbyabbreviationsasfollows(Explanatory
1
This specification is under the jurisdiction of ASTM Committee B01 on
Note 2 and Note 8):
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on
3.1.2 ACSR/TW/AW2—ACSR/TW using aluminum-clad
Conductors of Light Metals.
steel wire, normal strength (Specification B502).
Current edition approved April 1, 2014. Published April 2014. Originally
approved in 1987. Last previous edition approved in 2012 as B779– 12. DOI:
10.1520/B0779-14.
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, PO Box C700, West Conshohocken, PA 19428-2959. United States
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B779−14
TABLE 1 Construction Requirements
...

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 − 12 B779 − 14
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.
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)
B263 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
B502 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
B606 Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-Alloy
Conductors, Steel Reinforced
B802/B802M Specification for Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors,
Steel Reinforced (ACSR)
B803 Specification for High-Strength Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in Overhead
Electrical Conductors
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)
2.2 Other Documents:
3
ANSI H35.1 American National Standard Alloy and Temper Designation Systems for Aluminum
4
NBS Handbook 100 Handbook 100—Copper — Copper Wire Tables of the National 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 Conductors
of Light Metals.
Current edition approved June 1, 2012April 1, 2014. Published October 2012April 2014. Originally approved in 1987. Last previous edition approved in 20092012 as
B779 – 03 (2009).B779 – 12. DOI: 10.1520/B0779-12.10.1520/B0779-14.
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.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.B01
4
Available from National Technical Information Service (NTIS), 5285 Port Royal Rd., Springfield, VA 22161, http://www.ntis.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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