ASTM B942-10
(Guide)Standard Guide for Specification and Quality Assurance for the Electrical Contact Performance of Crimped Wire Terminations
Standard Guide for Specification and Quality Assurance for the Electrical Contact Performance of Crimped Wire Terminations
SIGNIFICANCE AND USE
The purpose of this guide is to provide end-product manufacturers and other users with technical information and methods recommended towards the achievement of successful application of crimped wire terminals.
For any given use, there is generally a choice of terminal types available, employing different mechanical design, materials, and installation tooling. Although terminals available to choose from may be similarly rated, typically according to wire sizes and combinations, their electrical contact performance in the end product may vary substantially. For many applications, the end-product reliability and user safety is substantially influenced by the choice of terminal and the quality of the completed termination. This guidance document contains specialized information on selection, assembly, and quality control of crimped wire terminals, covering aspects considered to be necessary to achieve reliable long-term operation in the intended application. This information is not generally found in commercial literature or textbooks. The methods discussed utilize connection resistance as the primary measure of termination quality, and change of connection resistance with time as the measure of termination deterioration. The methods are based on a foundation of modern electrical contact theory and practice.
SCOPE
1.1 This guide contains practices for specifying and evaluating the electrical contact performance of crimped-type terminations with solid or stranded conductors.
1.2 This guide provides information relevant to the electrical contact performance of a crimped wire termination. It does not cover other aspects of selection and use of crimped terminals.
1.3 The methods discussed in this guide apply only to the wire termination, which is the electrical contact interface between the conductor(s) and the terminal. Other aspects important to terminal evaluation, such as the properties and performance of electrical insulation, the effectiveness of strain relief features, and the quality of contact between the terminal and other electrical circuit elements, are not included.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
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Designation: B942 – 10
Standard Guide for
Specification and Quality Assurance for the Electrical
1
Contact Performance of Crimped Wire Terminations
This standard is issued under the fixed designation B942; 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.
1. Scope B827 Practice for Conducting Mixed Flowing Gas (MFG)
Environmental Tests
1.1 This guide contains practices for specifying and evalu-
B845 Guide for Mixed Flowing Gas (MFG) Tests for
ating the electrical contact performance of crimped-type ter-
Electrical Contacts
minations with solid or stranded conductors.
B868 Practice for Contact Performance Classification of
1.2 This guide provides information relevant to the electri-
Electrical Connection Systems
cal contact performance of a crimped wire termination. It does
B913 Test Method for Evaluation of Crimped Electrical
not cover other aspects of selection and use of crimped
Connections to 16-Gauge and Smaller Diameter Stranded
terminals.
and Solid Conductors
1.3 The methods discussed in this guide apply only to the
E122 Practice for Calculating Sample Size to Estimate,
wire termination, which is the electrical contact interface
With Specified Precision, the Average for a Characteristic
between the conductor(s) and the terminal. Other aspects
of a Lot or Process
important to terminal evaluation, such as the properties and
3
2.2 Other References:
performance of electrical insulation, the effectiveness of strain
UL 486-A Wire connectors and Soldering Lugs for Use
relief features, and the quality of contact between the terminal
With Copper Conductors
and other electrical circuit elements, are not included.
UL-310 Electrical Quick-Connect Terminals
1.4 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
3. Terminology
standard.
3.1 Many terms related to electrical contacts used in this
1.5 This standard does not purport to address all of the
guide are defined in Terminology B542.
safety concerns, if any, associated with its use. It is the
3.2 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to become familiar
3.2.1 connection resistance, n—the electrical resistance at-
with all hazards including those identified in the appropriate
tributable to a wire termination over and above that of an
Material Safety Data Sheet (MSDS) for this product/material
identical solid metallic structure without pressure contact
as provided by the manufacturer, to establish appropriate
interfaces. For crimped terminations that are the subject of this
safety and health practices, and determine the applicability of
guide, the connection resistance results from the resistance of
regulatory limitations prior to use.
amultitudeofcontactregionshavingbothfilmandconstriction
2. Referenced Documents resistance, plus, where stranded wire is involved, an additional
2
amount due to unequal current distribution among the wire
2.1 ASTM Standards:
strands at the termination.
B539 Test Methods for Measuring Resistance of Electrical
3.2.2 crimp, v—to establish an electrical and mechanical
Connections (Static Contacts)
attachmentbetweenthetwomembersbymechanicallydeform-
B542 Terminology Relating to Electrical Contacts and
ing one contact member around another. In most cases, one
Their Use
member is a stranded or solid wire, or a group of wires, the
other is a hollow cylinder or partial cylinder that is deformed
around the wire(s).
1
This guide is under the jurisdiction of ASTM Committee B02 on Nonferrous
3.2.3 crimp barrel, crimp tab, n—the portion of the crimp
Metals and Alloys and is the direct responsibility of Subcommittee B02.11 on
terminal that is deformed in the crimping operation.
Electrical Contact Test Methods.
Current edition approved Oct. 1, 2010. Published October 2010. Originally
3.2.4 crimped termination, n—a mechanical and electrical
approved in 2005. Last previous edition approved in 2005 as B972 - 05. DOI:
connection between a conductor, generally a wire, and a
10.1520/B0942-10.
2 component, typically a terminal specifically made for the
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’s Document Summary page on
3
the ASTM website. Available from Underwriters Laboratories Inc. (UL), http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
B942
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:B942–05 Designation: B942 – 10
Standard Guide for
Specification and Quality Assurance for the Electrical
1
Contact Performance of Crimped Wire Terminations
This standard is issued under the fixed designation B942; 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.
1. Scope
1.1 This guide contains practices for specifying and evaluating the electrical contact performance of crimped-type terminations
with solid or stranded conductors.
1.2 This guide provides information relevant to the electrical contact performance of a crimped wire termination. It does not
cover other aspects of selection and use of crimped terminals.
1.3 The methods discussed in this guide apply only to the wire termination, which is the electrical contact interface between
the conductor(s) and the terminal. Other aspects important to terminal evaluation, such as the properties and performance of
electrical insulation, the effectiveness of strain relief features, and the quality of contact between the terminal and other electrical
circuit elements, are not included.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 become familiar with all hazards including those identified in the appropriate Material Safety Data
Sheet (MSDS) for this product/material as provided by the manufacturer, 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:
B539 Test Methods for Measuring Resistance of Electrical Connections (Static Contacts)
B542 Terminology Relating to Electrical Contacts and Their Use
B827 Practice for Conducting Mixed Flowing Gas (MFG) Environmental Tests
B845 Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
B868 Practice for Contact Performance Classification of Electrical Connection Systems
B913 Test Method for Evaluation of Crimped Electrical Connections to 16-Gauge and Smaller Diameter Stranded and Solid
Conductors
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or
Process
3
2.2 Other References:
UL 486-A Wire connectors and Soldering Lugs for Use With Copper Conductors
UL-310 Electrical Quick-Connect Terminals
3. Terminology
3.1 Many terms related to electrical contacts used in this guide are defined in Terminology B542.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 connection resistance, n—the electrical resistance attributable to a wire termination over and above that of an identical
solid metallic structure without pressure contact interfaces. For crimped terminations that are the subject of this guide, the
connectionresistanceresultsfromtheresistanceofamultitudeofcontactregionshavingbothfilmandconstrictionresistance,plus,
1
This guide is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.11 on Electrical
Contact Test Methods.
Current edition approved Nov. 1, 2005. Published December 2005. DOI: 10.1520/B0942-05.
Current edition approved Oct. 1, 2010. Published October 2010. Originally approved in 2005. Last previous edition approved in 2005 as B972 - 05. DOI:
10.1520/B0942-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Underwriters Laboratories (UL), Corporate Progress, 333 Pfingsten Rd., Northbrook, IL 60062.
3
Available from Underwriters Laboratories Inc. (UL), http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
B942 – 10
where stranded wire is involved, an additional amount due to unequal current distribution among the wire strands at the
termination.
3.2.2 crimp, v—to establish an electrical and mechanical attachment between the two members by mechanically deformi
...
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