ASTM B193-16

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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Mar-2016
• ICS: 29.050 - Superconductivity and conducting materials
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.02 - Methods of Test and Sampling Procedure

Relations

• Replaces: ASTM B193-02(2014) - Standard Test Method for Resistivity of Electrical Conductor Materials
• Effective Date: 01-Apr-2016
• Referred By: ASTM B1005-17 - Standard Specification for Copper-Clad Aluminum Bar for Electrical Purposes (Bus Bar)
• Effective Date: 01-Apr-2016
• Referred By: ASTM B961-13(2019) - Standard Specification for Silver Coated Copper and Copper Alloy Stranded Conductors for Electronic Space Application
• Effective Date: 01-Apr-2016
• Referred By: ASTM B249/B249M-22 - Standard Specification for General Requirements for Wrought Copper and Copper-Alloy Rod, Bar, Shapes and Forgings
• Effective Date: 01-Apr-2016
• Referred By: ASTM B624-07(2017) - Standard Specification for High-Strength, High-Conductivity Copper-Alloy Wire for Electronic Application
• Effective Date: 01-Apr-2016
• Referred By: ASTM B5-22 - Standard Specification for High Conductivity Tough-Pitch Copper Refinery Shapes
• Effective Date: 01-Apr-2016
• Referred By: ASTM B173-17 - Standard Specification for Rope-Lay-Stranded Copper Conductors Having Concentric-Stranded Members, for Electrical Conductors
• Effective Date: 01-Apr-2016
• Referred By: ASTM B802/B802M-22 - Standard Specification for Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors, Steel Reinforced (ACSR)
• Effective Date: 01-Apr-2016
• Referred By: ASTM B441-22 - Standard Specification for Copper-Cobalt-Beryllium Alloy, Copper-Nickel-Beryllium Alloy, Copper-Nickel-Lead-Beryllium Alloy, and Copper-Nickel-Cobalt Alloy Rod and Bar
• Effective Date: 01-Apr-2016
• Referred By: ASTM B559-12(2017) - Standard Specification for Nickel-Coated, Copper-Clad Steel Wire for Electronic Application
• Effective Date: 01-Apr-2016
• Referred By: ASTM B75/B75M-20 - Standard Specification for Seamless Copper Tube
• Effective Date: 01-Apr-2016
• Referred By: ASTM B941-22 - Standard Specification for Heat Resistant Aluminum-Zirconium Alloy Wire for Electrical Purposes
• Effective Date: 01-Apr-2016
• Referred By: ASTM E543-21 - Standard Specification for Agencies Performing Nondestructive Testing
• Effective Date: 01-Apr-2016
• Referred By: ASTM B115-10(2021) - Standard Specification for Electrolytic Copper Cathode
• Effective Date: 01-Apr-2016
• Referred By: ASTM B901-04(2021) - Standard Specification for Compressed Round Stranded Aluminum Conductors Using Single Input Wire Construction
• Effective Date: 01-Apr-2016

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 − 16
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 Steel Core Wire for Use in Overhead Electrical Conduc-
tors
1.1 This test method covers the determination of the elec-
B566 Specification for Copper-Clad Aluminum Wire
trical resistivity of metallic electrical conductor material. It
B606 Specification for High-Strength Zinc-Coated (Galva-
provides for an accuracy of 60.30 % on test specimens having
nized) Steel Core Wire for Aluminum and Aluminum-
a resistance of 0.00001 Ω (10 µΩ) or more. Weight resistivity
Alloy Conductors, Steel Reinforced
accuracy may be adversely affected by possible inaccuracies in
B800 Specification for 8000 Series Aluminum Alloy Wire
the assumed density of the conductor.
for Electrical Purposes—Annealed and Intermediate Tem-
1.2 This standard does not purport to address all of the
pers
safety concerns, if any, associated with its use. It is the
B802 Specification for Zinc-5% Aluminum-Mischmetal
responsibility of the user of this standard to establish appro-
Alloy-Coated Steel Core Wire forAluminum Conductors,
priate safety and health practices and determine the applica-
Steel Reinforced (ACSR)[Metric](Discontinued 1998-
bility of regulatory limitations prior to use.
Replaced by B 802/B802M) B0802_B0802M
B803 Specification for High-Strength Zinc–5 %Aluminum-
2. Referenced Documents
Mischmetal Alloy-Coated Steel Core Wire for Use in
2
2.1 ASTM Standards: Overhead Electrical Conductors
A111 Specification for Zinc-Coated (Galvanized) “Iron” B957 Specification for Extra-High-Strength and Ultra-High-
Telephone and Telegraph Line Wire Strength Zinc-Coated (Galvanized) Steel Core Wire for
A326 Specification for Zinc-Coated (Galvanized) High Ten- Overhead Electrical Conductors
sile Steel Telephone and Telegraph Line Wire (Withdrawn B958 Specification for Extra-High-Strength and Ultra-High-
3
1990) Strength Class A Zinc–5% Aluminum-Mischmetal Alloy-
B9 Specification for Bronze Trolley Wire Coated Steel Core Wire for Use in Overhead Electrical
Conductors
B105 Specification for Hard-Drawn CopperAlloy Wires for
Electric Conductors 2.2 NIST Document:
4
B298 Specification for Silver-Coated Soft orAnnealed Cop- NBS Handbook 100 —Copper Wire Tables
per Wire
3. Resistivity
B355 SpecificationforNickel-CoatedSoftorAnnealedCop-
per Wire
3.1 Resistivity (Explanatory Note 1) is the electrical resis-
B415 Specification for Hard-Drawn Aluminum-Clad Steel tance of a body of unit length, and unit cross-sectional area or
Wire
unit weight.
B498/B498M Specification for Zinc-Coated (Galvanized)
3.2 VolumeResistivity is commonly expressed in ohms for a
theoretical conductor of unit length and cross-sectional area; in
inch-pound units in Ω·cmil/ft and in acceptable metric units in
2
1
This test method is under the jurisdiction of ASTM Committee B01 on
Ω·mm /m. It may be calculated by the following equation:
Electrical Conductors and is the direct responsibility of Subcommittee B01.02 on
ρ 5 A/L R
~ !
Methods of Test and Sampling Procedure. v
Current edition approved April 1, 2016. Published April 2016. Originally
where:
approved in 1944. Last previous edition approved in 2014 as B193 – 02 (2014).
2
DOI: 10.1520/B0193-16.
ρ = volume resistivity, Ω·cmil/ft or Ω·mm /m,
v
2
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
A = cross-sectional area, cmil or mm ,
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 − 16
where:
L = gage length, used to determine R,ftorm,and
3
R = measured resistance, Ω.
δ = density of the specimen, g/cm ;
W = weight of the specimen in air, g;
a
3.3 Weight Resistivity is commonly expressed in ohms for a
W = weight of the specimen in the liquid, g; and
l
theoretical conductor of unit length and weight. The method
3
d = density of the liquid at the test temperature, g/cm .
for calculating weight resistivit
...

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 − 02 (Reapproved 2014) B193 − 16
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 and health practices and determine the applicability of regulatory
limitations prior to use.
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
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.
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, 2014April 1, 2016. Published April 2014April 2016. Originally approved in 1944. Last previous edition approved in 20082014 as
B193 – 02 (2008).(2014). DOI: 10.1520/B0193-02R14.10.1520/B0193-16.
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.
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 − 16
3.2 Volume Resistivity is commonly expressed in ohms for a theoretical conductor of unit length and cross-sectional area; in
2
inch-pound units in Ω·cmil/ft and in acceptable metric units in Ω· mm /m. It may be calculated by the following equation:
ρ 5 A/L R
~ !
v
where:
2
ρ = volume resistivity, Ω·cmil/ft or Ω·mm /m,
v
2
A = cross-sectional area, cmil or mm ,
L = gage length, used to determine R, ft or m, and
R = measured re
...