ASTM B942-10(2015)

Standard Guide for Specification and Quality Assurance for the Electrical Contact Performance of Crimped Wire Terminations

SIGNIFICANCE AND USE
4.1 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.  
4.2 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 Safety Data Sheet (SDS) 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2015
• ICS: 29.120.20 - Connecting devices
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.11 - Electrical Contact Test Methods

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:B942 −10 (Reapproved 2015)
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 B542 Terminology Relating to Electrical Contacts and Their
Use
1.1 This guide contains practices for specifying and evalu-
B827 Practice for Conducting Mixed Flowing Gas (MFG)
ating the electrical contact performance of crimped-type ter-
Environmental Tests
minations with solid or stranded conductors.
B845 Guide for Mixed Flowing Gas (MFG) Tests for Elec-
1.2 This guide provides information relevant to the electri-
trical Contacts
cal contact performance of a crimped wire termination. It does
B868 Practice for Contact Performance Classification of
3
not cover other aspects of selection and use of crimped
Electrical Connection Systems (Withdrawn 2017)
terminals.
B913 Test Method for Evaluation of Crimped Electrical
Connections to 16-Gauge and Smaller Diameter Stranded
1.3 The methods discussed in this guide apply only to the
wire termination, which is the electrical contact interface and Solid Conductors
E122 Practice for Calculating Sample Size to Estimate,With
between the conductor(s) and the terminal. Other aspects
important to terminal evaluation, such as the properties and Specified Precision, the Average for a Characteristic of a
Lot or Process
performance of electrical insulation, the effectiveness of strain
4
relief features, and the quality of contact between the terminal 2.2 Other References:
and other electrical circuit elements, are not included. UL486-A WireconnectorsandSolderingLugsforUseWith
Copper Conductors
1.4 The values stated in SI units are to be regarded as
UL-310 Electrical Quick-Connect Terminals
standard. No other units of measurement are included in this
standard.
3. Terminology
1.5 This standard does not purport to address all of the
3.1 Many terms related to electrical contacts used in this
safety concerns, if any, associated with its use. It is the
guide are defined in Terminology B542.
responsibility of the user of this standard to become familiar
3.2 Definitions of Terms Specific to This Standard:
with all hazards including those identified in the appropriate
3.2.1 connection resistance, n—the electrical resistance at-
Safety Data Sheet (SDS) for this product/material as provided
tributable to a wire termination over and above that of an
by the manufacturer, to establish appropriate safety and health
identical solid metallic structure without pressure contact
practices, and determine the applicability of regulatory limi-
interfaces. For crimped terminations that are the subject of this
tations prior to use.
guide, the connection resistance results from the resistance of
amultitudeofcontactregionshavingbothfilmandconstriction
2. Referenced Documents
2 resistance, plus, where stranded wire is involved, an additional
2.1 ASTM Standards:
amount due to unequal current distribution among the wire
B539 Test Methods for Measuring Resistance of Electrical
strands at the termination.
Connections (Static Contacts)
3.2.2 crimp, v—to establish an electrical and mechanical
attachmentbetweenthetwomembersbymechanicallydeform-
1
ing one contact member around another. In most cases, one
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
member is a stranded or solid wire, or a group of wires, the
Electrical Contact Test Methods.
other is a hollow cylinder or partial cylinder that is deformed
Current edition approved Oct. 1, 2015. Published October 2015. Originally
ɛ1
around the wire(s).
approved in 2005. Last previous edition approved in 2010 as B972 10 . DOI:
10.1520/B0942-10R15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM The last approved version of this historical standard is referenced on
Standards volume information, refer to the standard’s Document Summary page on www.astm.org.
4
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 ----------------------
B942−10 (2015)
3.2.3 crimp barrel, crimp tab, n—the portion of the crimp 5.3 In many applications, substantial connection deteriora-
terminal that is deformed in the crimping
...

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.
´1
Designation: B942 − 10 B942 − 10 (Reapproved 2015)
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
ε NOTE—A Summary of Changes was added editorially in January 2011.
1. Scope*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)(SDS) 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:
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 Oct. 1, 2010Oct. 1, 2015. Published October 2010October 2015. Originally approved in 2005. Last previous edition approved in 20052010 as
ɛ1
B972 - 05.B972 10 . DOI: 10.1520/B0942-10E01.10.1520/B0942-10R15.
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
Available from Underwriters Laboratories Inc. (UL), http://www.ul.com.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B942 − 10 (2015)
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
connection resistance results from the resistance of a multitude of contact regions having both film and constriction resistance, plus,
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 mechan
...