ASTM B258-18

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of the standard as published by ASTM is to be considered the official document.
Designation: B258 − 14 B258 − 18
Standard Specification for
Standard Nominal Diameters and Cross-Sectional Areas of
AWG Sizes of Solid Round Wires Used as Electrical
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Conductors
This standard is issued under the fixed designation B258; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This specification prescribes standard nominal diameters and cross-sectional areas of American Wire Gage (AWG) sizes of
solid round wires, used as electrical conductors, and gives equations and rules for the calculation of standard nominal mass and
lengths, resistances, and breaking strengths of such wires (Explanatory Note 1).
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 of the two systems may result in nonconformance with the specification. For
conductor sizes designated by AWG or kcmil sizes, the requirements in SI units have been numerically converted from the
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.
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
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2.1 ASTM Standards:
A111 Specification for Zinc-Coated (Galvanized) “Iron” Telephone and Telegraph Line Wire
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A326 Specification for Zinc-Coated (Galvanized) High Tensile Steel Telephone and Telegraph Line Wire (Withdrawn 1990)
B1 Specification for Hard-Drawn Copper Wire
B2 Specification for Medium-Hard-Drawn Copper Wire
B3 Specification for Soft or Annealed Copper Wire
B9 Specification for Bronze Trolley Wire
B33 Specification for Tin-Coated Soft or Annealed Copper Wire for Electrical Purposes
B47 Specification for Copper Trolley Wire
B105 Specification for Hard-Drawn Copper Alloy Wires for Electric Conductors
B189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes
B193 Test Method for Resistivity of Electrical Conductor Materials
B227 Specification for Hard-Drawn Copper-Clad Steel Wire
B230/B230M Specification for Aluminum 1350–H19 Wire for Electrical Purposes
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B314 Specification for Aluminum 1350 Wire for Communication Cable (Withdrawn 1994)
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B396 Specification for Aluminum-Alloy 5005-H19 Wire for Electrical Purposes (Withdrawn 2003)
B398/B398M Specification for Aluminum-Alloy 6201-T81 and 6201-T83 Wire for Electrical Purposes
B415 Specification for Hard-Drawn Aluminum-Clad Steel Wire
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This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.02 on Methods of
Test and Sampling Procedure.
Current edition approved April 1, 2014Oct. 1, 2018. Published April 2014October 2018. Originally approved in 1951. Last previous edition approved in 20082014 as
B258 – 02 (2008).B258 – 14. DOI: 10.1520/B0258-14.10.1520/B0258-18.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
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The last approved version of this historical standard is referenced on www.astm.org.
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B258 − 18
B498/B498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
B502 Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
B606 Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-Alloy
Conductors, Steel Reinforced
B609/B609M Specification for Aluminum 1350 Round Wire, Annealed and Intermed
...