ASTM B1008-18

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.
Designation: B1008 − 18
Standard Test Method for
1
Stress-Strain Testing for Overhead Electrical Conductors
This standard is issued under the fixed designation B1008; 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.
3
1. Scope 2.2 Aluminum Association Document:
Aluminum Association Guide for Stress-Strain and Creep
1.1 This test method covers the measurement of the elastic
Testing of Conductors, 1999
andshort-termcreepcharacteristicsofconductorsforoverhead
4
2.3 IEC Document:
power lines.
IEC 61089:1991Appendix B, Stress-strain Test Method
1.2 Stress-strain data from tests performed in accordance
with IEC 61089 are compliant with this standard.
3. Terminology
1.3 Stress-strain data from prior Aluminum Association
3.1 Definitions:
testing procedures are compliant with this standard.
3.1.1 banding clamps, n—any of several means for locking
1.4 The values stated in either SI units or inch-pound units
together all strands of a conductor or core sample.
are to be regarded separately as standard. The values stated in
3.1.2 composite conductor, n—a conductor made of two
each system may not be exact equivalents; therefore, each
distinct elements, a single wire or stranded core primarily used
system shall be used independently of the other. Combining
for reinforcement or support and an outer stranded component
values from the two systems may result in non-conformance
of a second, more conductive material.
with the standard.
3.1.3 conductor stress-strain, n—elastic and short-term
1.5 This standard does not purport to address all of the
creep behavior of a conductor.
safety concerns, if any, associated with its use. It is the
3.1.4 creep, n—permanent elongation of a material under
responsibility of the user of this standard to establish appro-
stress, for a given temperature and time.
priate safety, health, and environmental practices and deter-
3.1.5 elastic strain, n—elongation caused by stress that is
mine the applicability of regulatory limitations prior to use.
completely recovered when the stress is released.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.1.6 final modulus, n—a linear relationship between stress
ization established in the Decision on Principles for the
and strain after the conductor has experienced its maximum
Development of International Standards, Guides and Recom-
strain.
mendations issued by the World Trade Organization Technical
3.1.7 gauge length (gauge section), n—the distance over
Barriers to Trade (TBT) Committee.
which the strain is measured.
3.1.8 gauge rod, n—the rigid frame used to set the gauge
2. Referenced Documents
length.
2
2.1 ASTM Standards:
3.1.9 homogeneous conductor, n—a conductor made of a
E4Practices for Force Verification of Testing Machines
single wire or stranded using strands of the same material.
E83Practice for Verification and Classification of Exten-
3.1.10 initial modulus, n—a fitted curve through test data
someter Systems
that describes the expected behavior of the conductor during
E220Test Method for Calibration of Thermocouples By
loading.
Comparison Techniques
3.1.11 modulus of elasticity (MOE, elastic modulus, E),
n—the slope of the linear, elastic portions of the stress-strain
1
This test method is under the jurisdiction of ASTM Committee B01 on
data for a conductor or conductor component.
Electrical Conductors and is the direct responsibility of Subcommittee B01.02 on
Methods of Test and Sampling Procedure.
Current edition approved Nov. 1, 2018. Published January 2019. DOI: 10.1520/
3
B1008-18. Available fromAluminumAssociation, 1400 Crystal Dr., Suite 430,Arlington,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or VA 22202, http://www.aluminum.org.
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Electrotechnical Commission (IEC), 3, rue de
Standards volume information, refer to the standard’s Document Summary page on Varembé, 1st Floor, P.O. Box 131, CH-1211, Geneva 20, Switzerland, http://
the ASTM website. www.iec.ch.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B1008 − 18
3.1.11.1 virtual stress (for composite conductors), n—stress mined. The most accurate method for determination of these
in a conductor component mu
...