ASTM B193-00

Standard Test Method for Resistivity of Electrical Conductor Materials

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 [omega] (10 µ[omega]) 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: 09-Apr-2002
• ICS: 29.050 - Superconductivity and conducting materials
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.02 - Methods of Test and Sampling Procedure

Relations

• Replaced By: ASTM B193-01 - Standard Test Method for Resistivity of Electrical Conductor Materials
• Effective Date: 10-Apr-2002
• Referred By: ASTM B372-22 - Standard Specification for Seamless Copper and Copper-Alloy Rectangular Waveguide Tube
• Effective Date: 10-Apr-2002
• Referred By: ASTM B2-13(2018) - Standard Specification for Medium-Hard-Drawn Copper Wire
• Effective Date: 10-Apr-2002
• Referred By: ASTM D1676-17 - Standard Test Methods for Film-Insulated Magnet Wire
• Effective Date: 10-Apr-2002
• Referred By: ASTM B258-18 - Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors
• Effective Date: 10-Apr-2002
• Referred By: ASTM A947M-16 - Standard Specification for Textured Stainless Steel Sheet [Metric]
• Effective Date: 10-Apr-2002
• Referred By: ASTM B738-13(2018) - Standard Specification for Fine-Wire Bunch-Stranded and Rope-Lay Bunch-Stranded Copper Conductors for Use as Electrical Conductors
• Effective Date: 10-Apr-2002
• Referred By: ASTM B187/B187M-20 - Standard Specification for Copper, Bus Bar, Rod, and Shapes and General Purpose Rod, Bar, and Shapes
• Effective Date: 10-Apr-2002
• Referred By: ASTM B901-04(2021) - Standard Specification for Compressed Round Stranded Aluminum Conductors Using Single Input Wire Construction
• Effective Date: 10-Apr-2002
• Referred By: ASTM B606/B606M-22 - Standard Specification for High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Aluminum and Aluminum-Alloy Conductors, Steel Reinforced
• Effective Date: 10-Apr-2002
• Referred By: ASTM B49-20 - Standard Specification for Copper Rod for Electrical Purposes
• Effective Date: 10-Apr-2002
• Referred By: ASTM B5-22 - Standard Specification for High Conductivity Tough-Pitch Copper Refinery Shapes
• Effective Date: 10-Apr-2002
• Referred By: ASTM B976-21 - Standard Specification for Fiber Reinforced Aluminum Matrix Composite (AMC) Core Wire for Aluminum Conductors Aluminum Matrix Composite Reinforced (ACAMCR) (formerly known as ACCR)
• Effective Date: 10-Apr-2002
• Referred By: ASTM B502/B502M-19 - Standard Specification for Aluminum-Clad Steel Core Wire for Use in Overhead Electrical Aluminum Conductors
• Effective Date: 10-Apr-2002
• Referred By: ASTM B231/B231M-16(2021) - Standard Specification for Concentric-Lay-Stranded Aluminum 1350 Conductors
• Effective Date: 10-Apr-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 193 – 00
Standard Test Method for
1
Resistivity of Electrical Conductor Materials
This standard is issued under the fixed designation B 193; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Resistivity
1.1 This test method covers the determination of the elec- 3.1 Resistivity (Explanatory Note 1) is the electrical resis-
trical resistivity of metallic electrical conductor material. It tance of a body of unit length, and unit cross-sectional area or
provides for an accuracy of 60.30 % on test specimens having unit weight.
a resistance of 0.00001 V (10 μV) or more. Weight resistivity 3.2 Volume Resistivity is commonly expressed in ohms for
accuracy may be adversely affected by possible inaccuracies in a theoretical conductor of unit length and cross-sectional area;
the assumed density of the conductor. in inch-pound units in V·cmil/ft and in acceptable metric units
2
1.2 This standard does not purport to address all of the inV·mm /m. It may be calculated by the following equation:
safety concerns, if any, associated with its use. It is the
r 5 ~A/L!R
v
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
where:
2
r = volume resistivity, V·cmil/ft or V·mm /m,
2. Referenced Documents
v
2
A = cross-sectional area, cmil or mm ,
2.1 ASTM Standards:
L = gage length, used to determine R,ftorm,and
A 111 Specification for Zinc-Coated (Galvanized) “Iron”
R = measured resistance, V .
2
Telephone and Telegraph Line Wire
3.3 Weight Resistivity is commonly expressed in ohms for a
A 326 Specification for Zinc-Coated (Galvanized) High
theoretical conductor of unit length and weight. The method
2
Tensile Steel Telephone and Telegraph Line Wire
for calculating weight resistivity, based on resistance, length,
3
B 9 Specification for Bronze Trolley Wire
and weight measurements, of a test specimen is given in
B 105 Specification for Hard-Drawn Copper Alloy Wires
Explanatory Note 2.
3
for Electric Conductors
B 298 Specification for Silver-Coated Soft or Annealed
4. Apparatus
3
Copper Wire
4.1 Resistance shall be measured with a Kelvin-type double
B 355 Specification for Nickel-Coated Soft or Annealed
bridge or a potentiometer if the resistance of the specimen is
3
Copper Wire
below 1 V.Ifitis1 V or more, a Wheatstone bridge may be
B 415 Specification for Hard-Drawn Aluminum-Clad Steel
used. Where applicable, a Hoopes conductivity bridge may be
3
Wire
used.
3
B 566 Specification for Copper-Clad Aluminum Wire
B 800 Specification for 8000 Series Aluminum Alloy Wire
5. Test Specimen
for Electrical Purposes—Annealed and Intermediate Tem-
5.1 The test specimen may be in the form of a wire, strip,
3
pers
rod, bar, tube, or shape. It shall be of uniform cross section
2.2 NIST Document:
throughout its length within 60.75 % of the cross-sectional
4
NBS Handbook 100— Copper Wire Tables
area. Wherever possible it shall be the full cross section of the
material it represents, if the full cross section is such that the
uniformity of the cross-sectional area can be accurately deter-
1
This test method is under the jurisdiction of ASTM Committee B01 on
mined.
Electrical Conductors and is the direct responsibility of Subcommittee B01.02on
Methods of Test and Sampling Procedure.
5.2 The test specimen shall have the following characteris-
Current edition approved Oct. 10, 2000. Published December 2000. Originally
tics:
published as B 193 – 44 T. Last previous edition B 193 – 95.
2 5.2.1 A resistance of at least 0.00001 V (10 μV) in the test
Annual Book of ASTM Standards, Vol 01.06.
3
length between potential contacts,
Annual Book of ASTM Standards, Vol 02.03.
4
Available from the National Institute of Standards and Technology (NIST),
5.2.2 A test length of at least 1 ft or 300 mm,
Gaithersburg, MD 20899.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
1

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B 193
5.2.3 A diameter, thickness, width, or other dimension current reversed, in direct succession. Check tests are recom-
suitable to the limitations of the resistance measuring instru- mended whereby the specimen is turned end for end, and the
ment, test repeated. Surface cleaning of the specimen at current and
5.2.4 No surface cracks or defects visible to the unaided potential contact points may be necessary to obtain good
electrical contact.
normal eye, and substantiall
...