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ASTM B779-03

(Specification)

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

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 2).
1.2 The values stated in inch-pound units are to be regarded as the standard with the exception of temperature, density, and resistivity. The SI equivalents of inch-pound units may be approximate.
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 Table3). For the purpose of this specification, the sizes listed in Table1 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 E 527.

General Information

Status
Historical
Publication Date
09-Apr-2003
ICS
29.240.20 - Power transmission and distribution lines
Technical Committee
B01 - Electrical Conductors
Drafting Committee
B01.07 - Conductors of Light Metals
Current Stage
Ref Project

Relations

Replaces
ASTM B779-96 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
Effective Date
10-Apr-2003
Replaced By
ASTM B779-03(2009) - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
Effective Date
01-Apr-2009
Referred By
ASTM B1006-17 - Standard Specification for Electrical Overhead Conductor Code Word Names
Effective Date
10-Apr-2003

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ASTM B779-03 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)ASTM B779-03 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
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ASTM B779-03 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
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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: B 779 – 03
Standard Specification for
Shaped Wire Compact Concentric-Lay-Stranded Aluminum
1
Conductors, Steel-Reinforced (ACSR/TW)
This standard is issued under the fixed designation B 779; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Core Wire for Aluminum Conductors, Steel Reinforced
2
(ACSR)
1.1 This specification covers shaped wire compact
B500 Specification for Metallic Coated Stranded Steel
concentric-lay-stranded aluminum conductor, steel-reinforced
Core for Aluminum Conductors, Steel Reinforced
(ACSR/TW) and its component wires for use as overhead
2
(ACSR)
electrical conductors (Explanatory Note 1 and Note 2).
B502 SpecificationforAluminum-CladSteelCoreWirefor
1.2 The values stated in inch-pound units are to be regarded
2
AluminumConductors,Aluminum-CladSteelReinforced
as the standard with the exception of temperature, density, and
B549 Specification for Concentric-Lay-Stranded Alumi-
resistivity. The SI equivalents of inch-pound units may be
num Conductors, Aluminum-Clad Steel Reinforced
approximate.
2
(ACSR/AW)
NOTE 1—ACSR/TW is designed to increase the aluminum area for a
B606 Specification for High-Strength Zinc-Coated (Galva-
given diameter of conductor by the use of trapezoidally shaped wires
nized)SteelCoreWireforAluminumandAluminumAlloy
(TW). The conductors consist of a central core of round steel wire(s)
2
Conductors, Steel Reinforced
surrounded by two or more layers of trapezoidal aluminum 1350-H19
B802 Specification for Zinc-5% Aluminum-Mischmetal
wires. Different strandings of the same size of conductor are identified by
type, which is the approximate ratio of steel area to aluminum area Alloy-Coated Steel Core Wire for Aluminum Conductors,
2
expressedinpercent(Table1,Table2andTable3).Forthepurposeofthis
Steel Reinforced (ACSR)
specification, the sizes listed in Table 1 and Table 2 are tabulated on the
B 803 Specification for High-Strength Zinc-5 %
basisofthefinishedconductorhavinganareaoroutsidediameterequalto
Aluminum-Mischmetal Alloy-Coated Steel Core Wire for
that of specific sizes of standard ACSR so as to facilitate conductor
Aluminum and Aluminum-Alloy Conductors, Steel Rein-
selection.
2
forced
NOTE 2—The aluminum and temper designations conform to ANSI
E29 Practice for Using Significant Digits in Test Data to
Standard H35.1. Aluminum 1350 corresponds to Unified Numbering
3
System (UNS) A91350 in accordance with Practice E527. Determine Conformance with Specifications
4
E527 Practice for Numbering Metals and Alloys (UNS)
2. Referenced Documents
2.2 Other Documents:
2.1 ASTM Standards:
ANSI H35.1 American National Standard Alloy and Tem-
5
B230 SpecificationforAluminum1350-H19WireforElec-
per Designation Systems for Aluminum
2
trical Purposes
NBS Handbook 100—Copper Wire Tables of the National
6
B232 Specification for Concentric-Lay-Stranded Alumi-
Bureau of Standards
2
num Conductors, Coated Steel-Reinforced (ACSR)
3. Terminology
B263 Test Method for Determination of Cross-Sectional
2
Area of Stranded Conductors
3.1 Definitions of Terms Specific to This Standard:
B341 Specification for Aluminum-Coated (Aluminized) 3.1.1 ACSR/TWcoveredbythisspecificationhasfivetypes
Steel Core Wire for Aluminum Conductors, Steel Rein-
of coated core wire and one type of aluminum-clad core wire
2
forced (ACSR/AZ) which are designated by abbreviations as follows (Explanatory
B354 Terminology Relating to Uninsulated Metallic Elec-
Note 2):
2
trical Conductors 3.1.1.1 ACSR/TW/AW—ACSR/TW using aluminum-clad
B498 Specification for Zinc-Coated (Galvanized) Steel
steel wire (Specification B502).
1 3
This specification is under the jurisdiction of ASTM Committee B01 on Annual Book of ASTM Standards, Vol 14.02.
4
Electrical Conductors and is the direct responsibility of Subcommittee B01.07 on Annual Book of ASTM Standards, Vol 01.01.
5
Conductors of Light Metals. Available from American National Standards Institute, 11 West 42nd Street,
Current edition approved April 10, 2003. Published June 2003. Originally New York, NY 10036.
6
approved in 1987. Last previous edition approved in 1996 as B779–96. AvailablefromNationalTechnicalInformationService,5285PortRoyalRoad,
2
Annual Book of ASTM Standards, Vol 02.03. Springfield, VA 22161.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B 779–03
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
...

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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.
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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.
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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.

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Standard Specification for Concentric-Lay-Stranded Self-Damping Aluminum Conductors, Steel Reinforced (ACSR/SD)

ABSTRACT
This specification covers concentric-lay-stranded self-damping aluminum conductors, steel-reinforced, and its component wires for use as overhead electrical conductors. The tensile strength and elongation requirements of the round and trapezoidal wires shall be the same except for the shape and diameter tolerance. Joints shall not be made in the finished steel wires. The lay factor and direction are specified. The strength and electrical resistance of a complete conductor are calculated. Tests for mechanical and electrical properties of aluminum and steel core wires shall be made before stranding. Gap dimensions shall be measured during fabrication of the conductor.
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1.1 This specification covers concentric-lay-stranded self-damping aluminum conductor, steel-reinforced (ACSR/SD), and its component wires for use as overhead electrical conductors (Explanatory Notes 1 and 2).  
1.2 The values stated in inch-pound or SI units are to be regarded separately as standard. Each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification. For conductor sizes designated by AWG or kcmil, the requirements in SI units have been numerically converted from corresponding values stated or derived in inch-pound units. For conductor sizes designated by SI units only, the requirements are stated or derived in SI units.  
1.2.1 For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.
Note 1: ACSR/SD is designed to control aeolian vibration by integral damping. The conductors consist of a central core of a round steel wire or wires surrounded by two layers of trapezoidal aluminum 1350-H19 wires or two layers of trapezoidal aluminum 1350-H19 wires and one layer of round aluminum 1350-H19 wires (Fig. 1). The trapezoidal-wire layers are separated from each other and from the steel core by two small annular gaps that provide the conductors self-damping characteristics. The round aluminum wires are in tight layer contact between themselves and the underlying trapezoidal wire layer. 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 and Table 2).  
FIG. 1 Illustrations of Typical ACSR/SD Strandings
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Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors (AAC/TW)

ABSTRACT
This specification covers shaped wire compact concentric-lay-stranded aluminum conductor (AAC/TW) and its component wires for use as overhead electrical conductors. The trapezoidal aluminum wires shall meet the prescribed tensile strength and elongation requirements. Electric-butt welds, electric-butt cold-upset welds, or cold-pressure welds may be made in the individual aluminum wires during the stranding process. Requirements for the lay and construction of the conductor are detailed. The methods of determining the rated strength, breaking strength, mass, and electrical resistance are given. Tests for mechanical and electrical properties of aluminum wires shall be made before stranding. For the purpose of calculating mass per unit length, cross-sections, and the like, the density of aluminum to be taken is specified.
SCOPE
1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductor (AAC/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 the standard with the exception of temperature and resistivity. The SI equivalents of inch-pound units may be approximate.  
Note 1: AAC/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 one round aluminum wire or a seven-strand compact round core surrounded by two or more layers of trapezoidal aluminum 1350-H19 wires. For the purposes of this specification, the sizes listed are tabulated on the basis of the finished conductor having an area equal to that of specific sizes of standard AAC (Table 1) or in fixed diameter increments (Table 2) 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.

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  • Technical specification
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    English language
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