ASTM B193-19

Standard Test Method for Resistivity of Electrical Conductor Materials

ABSTRACT
This test method covers the determination of the electrical resistivity of metallic electrical conductor material. Weight resistivity accuracy may be adversely affected by possible inaccuracies in the assumed density of the conductor. The definition of resistivity and the equations for calculating volume resistivity and weight resistivity are given. Resistance shall be measured using an apparatus with a circuit configuration and instrumentation that has a resistance measurement capability of the prescribed accuracy. The test specimen requirements and the test procedure including: (1) determination of dimensions (such as length and cross-section), weight, and density, and (2) resistance measurement are detailed. The formula for calculating the corrected resistance, when the measurement is made at any temperature other than a reference temperature, is given. No statement of precision has been made and no work has been planned to develop such a statement. This test method has no bias because the value for resistivity is determined solely in terms of this test method.
SCOPE
1.1 This test method covers the determination of the electrical resistivity of metallic electrical conductor material. It provides for an accuracy of ±0.30 % on test specimens having a resistance of 0.00001 Ω (10 μΩ) or more. Weight resistivity accuracy may be adversely affected by possible inaccuracies in the assumed density of the conductor.  
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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: 30-Sep-2019
• ICS: 29.050 - Superconductivity and conducting materials
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.02 - Methods of Test and Sampling Procedure

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B193 − 19
Standard Test Method for
1
Resistivity of Electrical Conductor Materials
This standard is issued under the fixed designation B193; 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 B355 SpecificationforNickel-CoatedSoftorAnnealedCop-
per Wire
1.1 This test method covers the determination of the elec-
B498/B498M Specification for Zinc-Coated (Galvanized)
trical resistivity of metallic electrical conductor material. It
Steel Core Wire for Use in Overhead Electrical Conduc-
provides for an accuracy of 60.30 % on test specimens having
tors
a resistance of 0.00001 Ω (10 µΩ) or more. Weight resistivity
B566 Specification for Copper-Clad Aluminum Wire
accuracy may be adversely affected by possible inaccuracies in
B606 Specification for High-Strength Zinc-Coated (Galva-
the assumed density of the conductor.
nized) Steel Core Wire for Aluminum and Aluminum-
1.2 This standard does not purport to address all of the
Alloy Conductors, Steel Reinforced
safety concerns, if any, associated with its use. It is the
B800 Specification for 8000 Series Aluminum Alloy Wire
responsibility of the user of this standard to establish appro-
for Electrical Purposes—Annealed and Intermediate Tem-
priate safety, health, and environmental practices and deter-
pers
mine the applicability of regulatory limitations prior to use.
B802 Specification for Zinc-5% Aluminum-Mischmetal
1.3 This international standard was developed in accor-
Alloy-Coated Steel Core Wire forAluminum Conductors,
dance with internationally recognized principles on standard-
Steel Reinforced (ACSR)[Metric](Discontinued 1998-
ization established in the Decision on Principles for the
Replaced by B 802/B802M) B0802_B0802M
Development of International Standards, Guides and Recom-
B803 Specification for High-Strength Zinc–5 % Aluminum-
mendations issued by the World Trade Organization Technical
Mischmetal Alloy-Coated Steel Core Wire for Use in
Barriers to Trade (TBT) Committee.
Overhead Electrical Conductors
B957 Specification for Extra-High-Strength and Ultra-High-
2. Referenced Documents
Strength Zinc-Coated (Galvanized) Steel Core Wire for
2
2.1 ASTM Standards:
Overhead Electrical Conductors
A111 Specification for Zinc-Coated (Galvanized) “Iron”
B958 Specification for Extra-High-Strength and Ultra-High-
Telephone and Telegraph Line Wire
Strength Class A Zinc–5% Aluminum-Mischmetal Alloy-
A326 Specification for Zinc-Coated (Galvanized) High Ten-
Coated Steel Core Wire for Use in Overhead Electrical
sile Steel Telephone and Telegraph Line Wire (Withdrawn
Conductors
3
1990)
2.2 NIST Document:
B9 Specification for Bronze Trolley Wire
4
NBS Handbook 100 —Copper Wire Tables
B105 Specification for Hard-Drawn CopperAlloy Wires for
Electric Conductors
3. Resistivity
B298 Specification for Silver-Coated Soft orAnnealed Cop-
3.1 Resistivity (Explanatory Note 1) is the electrical resis-
per Wire
tance of a body of unit length, and unit cross-sectional area or
unit weight.
1
This test method is under the jurisdiction of ASTM Committee B01 on
3.2 VolumeResistivity is commonly expressed in ohms for a
Electrical Conductors and is the direct responsibility of Subcommittee B01.02 on
theoretical conductor of unit length and cross-sectional area; in
Methods of Test and Sampling Procedure.
Current edition approved Oct. 1, 2019. Published October 2019. Originally
inch-pound units in Ω·cmil/ft and in acceptable metric units in
approved in 1944. Last previous edition approved in 2016 as B193 – 16. DOI: 2
Ω·mm /m. It may be calculated by the following equation:
10.1520/B0193-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ρ 5 A/L R
~ !
v
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 4
The last approved version of this historical standard is referenced on Available from National Institute of Standards and Technology (NIST), 100
www.astm.org. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B193 − 19
where: removing all air bubbles from the specimen when weighing it
2
in the liquid. Calculate the density from the following equa-
ρ = volume resistivity, Ω·cmil/ft or Ω·mm /m,
v
2
tion:
A = cross-sectional area, cmil or mm ,
L = gage leng
...

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: B193 − 16 B193 − 19
Standard Test Method for
1
Resistivity of Electrical Conductor Materials
This standard is issued under the fixed designation B193; 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 test method covers the determination of the electrical resistivity of metallic electrical conductor material. It provides
for an accuracy of 60.30 % on test specimens having a resistance of 0.00001 Ω (10 μΩ) or more. Weight resistivity accuracy may
be adversely affected by possible inaccuracies in the assumed density of the conductor.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
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:
A111 Specification for Zinc-Coated (Galvanized) “Iron” Telephone and Telegraph Line Wire
3
A326 Specification for Zinc-Coated (Galvanized) High Tensile Steel Telephone and Telegraph Line Wire (Withdrawn 1990)
B9 Specification for Bronze Trolley Wire
B105 Specification for Hard-Drawn Copper Alloy Wires for Electric Conductors
B298 Specification for Silver-Coated Soft or Annealed Copper Wire
B355 Specification for Nickel-Coated Soft or Annealed Copper Wire
B415 Specification for Hard-Drawn Aluminum-Clad Steel Wire
B498/B498M Specification for Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
B566 Specification for Copper-Clad Aluminum Wire
B606 Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-Alloy
Conductors, Steel Reinforced
B800 Specification for 8000 Series Aluminum Alloy Wire for Electrical Purposes—Annealed and Intermediate Tempers
B802 Specification for Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors, Steel
Reinforced (ACSR)[Metric](Discontinued 1998-Replaced by B 802/B802M) B0802_B0802M
B803 Specification for High-Strength Zinc–5 % Aluminum-Mischmetal Alloy-Coated 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
2.2 NIST Document:
4
NBS Handbook 100 —Copper Wire Tables
1
This test method 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, 2016Oct. 1, 2019. Published April 2016October 2019. Originally approved in 1944. Last previous edition approved in 20142016 as
B193 – 02 (2014).B193 – 16. DOI: 10.1520/B0193-16.10.1520/B0193-19.
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
The last approved version of this historical standard is referenced on www.astm.org.
4
Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B193 − 19
3. Resistivity
3.1 Resistivity (Explanatory Note 1) is the electrical resistance of a body of unit length, and unit cross-sectional area or unit
weight.
3.2 Volume Resistivity is commonly expressed in ohms for a theoretical conductor of unit length and cros
...