ASTM B779-18

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. (A) Code words shown in this column are obtained from Specification B1006. They are provided for information only.(B) Mass per unit length is based on Class A zinc-coated steel. To convert to kg/km, multiply the lb/1000 ft value × 1.4887.(C) Rated strengths were calculated in accordance with 9.1 using steel stresses at 1 % for Class A coating in accordance with Specification B498/B498M (1 kip = 1000 lbf = 4.448 kN).(D) To convert the diameter (inches) to mm, multiply the inch value × 25.4.(E) To convert from kcmil to mm2 area, multiply the kcmil value × 5.067 × 10-4.(F) For 795 kcmil Type 10 (Puffin ACSR TW) conductor the indicated 0.1108 in. steel wire size does not correspond with the concentric round wire 795 kcmil 22/7 Puffin ACSR conductor. The round wire construction utilizes a 0.1056” diameter steel core wire. The industry accepted dimension for the Puffin ACSR 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.  (A) Code words shown in this column are obtained from Specification B1006. They are provided for information only.(B) To convert from kcmil to mm2 area, multiply the kcmil value x 5.067 x 10-4.(C) Mass per unit length is based on Class A zinc-coated steel. To convert to kg/km, multiply the lb/1000 ft value x 1.4887.(D) Rated strength was calculated in accordance with 9.1 using steel stresses at 1 % for Class A coating in accordance with Specification B498/B498M (1 kip = 1000 lbf = 4.445 kN).(E) To convert the diameter (inches) to mm, multiply the inch value x 25.4.    
1.3 This international standard was developed in accordance with interna...

General Information

• Status: Historical
• Publication Date: 28-Feb-2018
• 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)

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 −18
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
B263Test Method for Determination of Cross-Sectional
concentric-lay-stranded aluminum conductor, steel-reinforced
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)
B502Specification forAluminum-Clad Steel Core Wire for
surrounded by two or more layers of trapezoidal aluminum 1350-H19
Use in Overhead Electrical Aluminum Conductors
wires. Different strandings of the same size of conductor are identified by
B549Specification for Concentric-Lay-Stranded Aluminum
type, which is the approximate ratio of steel area to aluminum area
Conductors, Aluminum-Clad Steel Reinforced for Use in
expressedinpercent(Table1,Table2andTable3).Forthepurposeofthis
specification, the sizes listed in Table 1 and Table 2 are tabulated on the
Overhead Electrical Conductors
basisofthefinishedconductorhavinganareaoroutsidediameterequalto
B606Specification for High-Strength Zinc-Coated (Galva-
that of specific sizes of standard ACSR so as to facilitate conductor
nized) Steel Core Wire for Aluminum and Aluminum-
selection.
Alloy Conductors, Steel Reinforced
NOTE 2—The aluminum and temper designations conform to ANSI
Standard H35.1. Aluminum 1350 corresponds to Unified Numbering B802/B802M Specification for Zinc–5 % Aluminum-
System (UNS) A91350 in accordance with Practice E527.
MischmetalAlloy-Coated Steel Core Wire forAluminum
Conductors, Steel Reinforced (ACSR)
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard- B803Specification for High-Strength Zinc–5%Aluminum-
Mischmetal Alloy-Coated Steel Core Wire for Use in
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- Overhead Electrical Conductors
B1006Specification for Electrical Overhead Conductor
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. Code Word Names
E29Practice for Using Significant Digits in Test Data to
2. Referenced Documents
Determine Conformance with Specifications
2
E527Practice for Numbering Metals and Alloys in the
2.1 ASTM Standards:
Unified Numbering System (UNS)
B230/B230MSpecification for Aluminum 1350–H19 Wire
for Electrical Purposes
2.2 Other Documents:
ANSIH35.1AmericanNationalStandardAlloyandTemper
3
Designation Systems for Aluminum
1
This specification is under the jurisdiction of ASTM Committee B01 on
NBS Handbook 100— Copper Wire Tables of the National
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on
4
Bureau of Standards
Conductors of Light Metals.
Current edition approved March 1, 2018. Published March 2018. Originally
approved in 1987. Last previous edition approved in 2014 as B779– 14. DOI:
10.1520/B0779-18.
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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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 − 14 B779 − 18
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)
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
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)
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 April 1, 2014March 1, 2018. Published April 2014March 2018. Originally approved in 1987. Last previous edition approved in 20122014 as
B779 – 12.14. DOI: 10.1520/B0779-14.10.1520/B0779-18.
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’sstandard’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
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B779 − 18
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TABLE 1 Construction Requir
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