ASTM B500/B500M-12(2018)

Standard Specification for Metallic Coated or Aluminum Clad Stranded Steel Core for Use in Overhead Electrical Conductors

ABSTRACT
This specification covers zinc-coated (galvanized), zinc-aluminum-mischmetal alloy-coated, and aluminum-coated (aluminized) stranded steel wire core inserted for use in aluminum conductors, steel reinforced (ACSR). Prior to stranding, the metallic coated steel wire to be used in the production of the stranded core shall meet all of the requirements of the appropriate specification. Requirements for (1) coated steel wire joints, (2) stranding of the core such as lay length and lay direction, (3) construction of ACSR, and (4) tensile properties of stranded core are detailed. The standard stranded core lengths and methods of determining rated strength and calculating loads are given.
SCOPE
1.1 This specification covers 7-wire, 19-wire, 37-wire, and 61-wire zinc-coated (galvanized), zinc-5 % aluminum-mischmetal alloy-coated or aluminum clad stranded steel core intended for use in overhead electrical conductors.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
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: Historical
• Publication Date: 28-Feb-2018
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.05 - Conductors of Ferrous 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B500/B500M −12 (Reapproved 2018)
Standard Specification for
Metallic Coated or Aluminum Clad Stranded Steel Core for
Use in Overhead Electrical Conductors
This standard is issued under the fixed designation B500/B500M; 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 Alloy Conductors, Steel Reinforced
B802/B802M Specification for Zinc–5 % Aluminum-
1.1 This specification covers 7-wire, 19-wire, 37-wire, and
MischmetalAlloy-Coated Steel Core Wire forAluminum
61-wire zinc-coated (galvanized), zinc-5 % aluminum-
Conductors, Steel Reinforced (ACSR)
mischmetal alloy-coated or aluminum clad stranded steel core
B803Specification for High-Strength Zinc–5%Aluminum-
intended for use in overhead electrical conductors.
Mischmetal Alloy-Coated Steel Core Wire for Use in
1.2 The values stated in either SI units or inch-pound units
Overhead Electrical Conductors
are to be regarded separately as standard. The values stated in
E83Practice for Verification and Classification of Exten-
each system may not be exact equivalents; therefore, each
someter Systems
system shall be used independently of the other. Combining
B502Specification for Aluminum-Clad Steel Core Wire for
values from the two systems may result in non-conformance
Use in Overhead Electrical Aluminum Conductors
with the standard.
3. Terminology
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.1 Definitions of Terms Specific to This Standard:
ization established in the Decision on Principles for the
3.1.1 lot—unless otherwise specified in the contract or
Development of International Standards, Guides and Recom-
order, a lot shall consist of all coils or reels of strand of the
mendations issued by the World Trade Organization Technical
same diameter and unit lengths submitted for inspection at the
Barriers to Trade (TBT) Committee.
same time.
3.1.2 production lot—all of the wire spools loaded into a
2. Referenced Documents
stranding machine that are used to produce a completed strand
2.1 ASTM Standards:
cable.
B498/B498MSpecification for Zinc-Coated (Galvanized)
Steel Core Wire for Use in Overhead Electrical Conduc-
4. Ordering Information
tors
4.1 Ordersformaterialunderthisspecificationshallinclude
B957Specification for Extra-High-Strength and Ultra-High-
the following information:
Strength Zinc-Coated (Galvanized) Steel Core Wire for
4.1.1 Length of each construction,
Overhead Electrical Conductors
4.1.2 Constructional description of stranded core (for
B958Specification for Extra-High-Strength and Ultra-High-
example, 7 × 0.0943 in. or 19 × 0.0977 in.) (8.1 and 8.2),
Strength Class A Zinc–5% Aluminum-Mischmetal Alloy-
4.1.3 The multiple length of stranded core and the total
Coated Steel Core Wire for Use in Overhead Electrical
numberofmultiplelengthsperreel,ifallowed(8.3andSection
Conductors
15),
B606Specification for High-Strength Zinc-Coated (Galva-
4.1.4 Strength and coating type or aluminum clad (Section
nized) Steel Core Wire for Aluminum and Aluminum-
8),
4.1.5 Direction of lay of outer layer (Section 7),
1 4.1.6 Packaging (Section 15), and
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on
4.1.7 Place of inspection (Section 13).
Conductors of Ferrous Metals.
Current edition approved March 1, 2018. Published March 2018. Originally
5. Material
approved in 1969. Last previous edition approved in 2012 as B500/B500M–12.
DOI: 10.1520/B0500_B0500M-12R18.
5.1 The coated or aluminum clad steel wire used in the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
production of the stranded core shall, prior to stranding, meet
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
all of the requirements of the appropriate specification that
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. follows:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B500/B500M−12 (2018)
5.1.1 Specification B498/B498M, 8.3 Recommended standard unit-stranded-core multiple
5.1.2 Specification B606, lengths are given in respective ASTM Conductor Standards.
5.1.3 Specification B802/B802M, and
9. Length Tolerance
5.1.4 Specification B803.
9.1 All lengths of stranded core shall be furnished to a
5.1.5 Specification B957.
length tolerance of 62%.
5.1.6 Specification B958.
5.1.7 Specification B502.
10. Tensile Properties
6. Joints
10.1 The rated ultimate strength or strength at 1% exten-
sion of stranded core for overhead electrical conductors shall
6.1 Thereshallbenojointsofanykindmadeinthefinished
be taken as that percentage according to the number of wires,
zinc-coated, zinc-5% aluminum-mischmetal alloy-coated or
indicated below, of the sum of the strengths of the steel wires,
aluminum clad steel wires.
calculated from their specified nominal wire diameter and the
appropriate specified minimum stress at 1% extension or
7. Stranding
ultimate strength given in Specifications B498/B498M, B606,
7.1 The lay length of the 6-wire layer of 7 and 19-wire
B802/B802M, B803, B957, B958 or B502:
stranded core shall be not less than 16 or more than 26 times
7 2 wirestrand 2 96% ofsumofcomponents
the outside diameter of the 6-wire layer. (Outside diameter is
three times nominal wire diameter.)
19 2 wirestrand 2 93% ofsumofcomponents
7.2 Thelaylengthofthe12-wirelayerofa19-wirestranded
37 2 wirestrand 2 91% ofsumofcomponents
coreshallbenotlessthan14ormorethan22timestheoutside
61 2 wirestrand 2 90% ofsumofcomponents
diameter of the 12-wire layer. (Outside diameter is five times
10.2 Strandedsteelcoresamplesshallsustainloadsequalto
nominal wire diameter.)
or greater than the values computed by the method of 10.1.
7.3 Thelaylengthofthe18-wirelayerofa37-wirestranded
Compliance can be shown either by testing the completed
coreshallbenotlessthan14ormorethan20timestheoutside
strand or by calculation using the strand’s individual wire
diameterofthe18-wirelayer.(Outsidediameterisseventimes
properties (e.g., ultimate strength or stress at 1% extension).
nominal wire diameter.)
When calculating the strand strengths using the strand’s
individual wire properties, it shall be computed as the percent-
7.4 Thelaylengthofthe24-wirelayerofa61-wirestranded
coreshallbenotlessthan14ormorethan18timestheoutside age of the sum of the actual wire strengths as indicated below:
diameter of the 24-wire layer. (Outside diameter is nine times
7 2 wirestrand 2 96% ofsumo
...

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: B500/B500M − 12 B500/B500M − 12 (Reapproved 2018)
Standard Specification for
Metallic Coated or Aluminum Clad Stranded Steel Core for
Use in Overhead Electrical Conductors
This standard is issued under the fixed designation B500/B500M; 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*Scope
1.1 This specification covers 7-wire, 19-wire, 37-wire, and 61-wire zinc-coated (galvanized), zinc-5 % aluminum-mischmetal
alloy-coated or aluminum clad stranded steel core intended for use in overhead electrical conductors.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
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
2.1 ASTM Standards:
B498/B498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
B957 Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Overhead
Electrical Conductors
B958 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
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
E83 Practice for Verification and Classification of Extensometer Systems
B502 Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 lot—unless otherwise specified in the contract or order, a lot shall consist of all coils or reels of strand of the same diameter
and unit lengths submitted for inspection at the same time.
3.1.2 production lot—all of the wire spools loaded into a stranding machine that are used to produce a completed strand cable.
4. Ordering Information
4.1 Orders for material under this specification shall include the following information:
4.1.1 Length of each construction,
4.1.2 Constructional description of stranded core (for example, 7 × 0.0943 in. or 19 × 0.0977 in.) (8.1 and 8.2),
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on Conductors
of Ferrous Metals.
Current edition approved April 1, 2012March 1, 2018. Published May 2012March 2018. Originally approved in 1969. Last previous edition approved in 20102012 as
B500/B500M – 10.B500/B500M – 12. DOI: 10.1520/B0500_B0500M-12. 10.1520/B0500_B0500M-12R18.
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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B500/B500M − 12 (2018)
4.1.3 The multiple length of stranded core and the total number of multiple lengths per reel, if allowed (8.3 and Section 15),
4.1.4 Strength and coating type or aluminum clad (Section 8),
4.1.5 Direction of lay of outer layer (Section 7),
4.1.6 Packaging (Section 15), and
4.1.7 Place of inspection (Section 13).
5. Material
5.1 The coated or aluminum clad steel wire used in the production of the stranded core shall, prior to stranding, meet all of the
requirements of the appropriate specification that follows:
5.1.1 Specification B498/B498M,
5.1.2 Specification B606,
5.1.3 Specification B802/B802M, and
5.1.4 Specification B803.
5.1.5 Specification B957.
5.1.6 Specification B958.
5.1.7 Specification B502.
6. Joints
6.1 There shall be no joints of any kind made in the finished zinc-coated, zinc-5 % aluminum-mischmetal alloy-coated or
aluminum clad steel wires.
7. Stranding
7.1 The lay length of the 6-wire layer of 7 and 19-wire stranded core shall be not less than 16 or more than 26 times the outside
diameter of the 6-wire layer. (Outside diameter is three times nominal wire diameter.)
7.2 The lay length of the 12-wire layer of a 19-wire stranded core shall be not less than 14 or more than 22 times the outside
diameter of the 12-wire layer. (Outside diameter is five times nominal wire diameter.)
7.3 The lay length of the 18-wire layer of a 37-wire stranded core shall be not less than 14 or more than 20 times the outside
diameter of the 18-wire layer. (Outside diameter is seven times nominal wire diameter.)
7.4 The lay length of the 24-wire layer of a 61-wire stranded core shall be not less than 14 or more than 18 times the outside
diameter of the 24-wire layer. (Outside diameter is nine times nominal wire diameter.)
7.5 The steel wires shall be so stranded that when the stranded core is cut the individual wires can be readily regrouped and
then held in place by one hand.
7.6 For construction containing 19 or more wires, the direction of lay will alternate with each layer.
7.7 The direction of lay of the outer layer shall be as specified by the purchaser at the time of placing the order.
8. Construction and Recommended Standard Stranded-Core Lengths
8.1 Overhead Electrical Conductors may be constructed using steel core wire with any one of the protective coatings or
aluminum clad and associated strength grades. The acceptable core wires are produced to ASTM Specifications shown in Section
5 of this standard.
8.2 The number and diameters of the steel wires shall conform to the requirements in respective ASTM Conductor Standards.
8.3 Recommended standard unit-stranded-core multiple lengths are given in respective ASTM Conductor Standards.
9. Length Tolerance
9.1 All lengths of stranded core shall be furnished to a length tolerance of 62 %.
10. Tensile Properties
10.1 The rated ultimate strength or strength at 1 % extension of stranded core for overhead electrical conductors shall be taken
as that percentage according to the number of wires, indicated below, of the sum of the strengths of the steel wires, calculated from
their specified nominal wire diameter and the appropriate specified minimum stress at 1 % extension or ultimate strength given in
Specifications B498/B498M, B606, B802/B802M, B803, B957, B958 or B502:
72 wire strand 2 96
...