ASTM B868-1996(2008) Standard Practice for Contact Performance Classification of Electrical Connection Systems《电气连接系统的接触性能分类的标准实施规程》.pdf
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1、Designation: B 868 96 (Reapproved 2008)Standard Practice forContact Performance Classification of Electrical ConnectionSystems1This standard is issued under the fixed designation B 868; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice provides a uniform method of specifyingperformance requirements for (or reporting test r
3、esults of)electrical contact and connection systems. Both conductor andconnector system performance may be specified by this prac-tice, separately or in combination.1.2 This practice may be used for separable or permanentcontacts employing metallic conductors and contacts.1.3 This practice provides
4、methods for both signal andpower applications.1.4 This practice does not specify the sample preparation ortest sequences required for determining contact performance. Itis the responsibility of the user of this practice to determine theapplied test sequence(s) appropriate for the application.1.5 Thi
5、s standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet (MSDS) for this product/materialas provid
6、ed by the manufacturer, to establish appropriatesafety and health practices, and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 539 Test Methods for Measuring Resistance of ElectricalConnections (Static Contacts)B 542 Terminology Relati
7、ng to Electrical Contacts andTheir UseB 812 Test Method for Resistance to Environmental Deg-radation of Electrical Pressure Connections InvolvingAluminum and Intended for Residential Applications2.2 UL Standard:UL 486B Wire Connectors for Use with Aluminum Con-ductors, Third Edition, 199133. Termino
8、logy3.1 Terms used in this practice are defined in TerminologyB 542 except as noted in 3.2.3.2 Definitions of Terms Specific to This Standard:3.2.1 conductor, nelectrically conductive member carry-ing current to a contact interface. Examples are wire and cable,busbar, and conductive paths on an etch
9、ed printed circuitboard.3.2.2 contact performance, ncontact interface behavior asindicated by initial electrical resistance and resistance changeunder the applied test conditions.4. Summary of Practice4.1 The prescribed performance specification (or reporting)statement consists of three sections, as
10、 follows:4.1.1 Performance Classification, in accordance with thispractice (Section 6).4.1.2 Variability Index, determined by sample size anddistribution of resistance values measured at end of test, inaccordance with this practice (Section 7).4.1.3 Statement of test method employed to determineperf
11、ormance classification.4.2 The format for the performance specification (or report-ing) statement is as follows:1This practice is under the jurisdiction of ASTM Committee B02 on NonferrousMetals and Alloys and is the direct responsibility of Subcommittee B02.11 onElectrical Contact Test Methods.Curr
12、ent edition approved March 1, 2008. Published March 2008. Originallyapproved in 1996. Last previous edition approved in 2002 as B 868 96 (2002)e3.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards
13、 volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Underwriters Laboratories (UL), 333 Pfingsten Rd., North-brook, IL 60062-2096, http:/.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United State
14、s.5. Significance and Use5.1 This practice is based on the use of electrical resistanceas an indicator of contact performance.5.2 Existing standards, such as those referenced in Section 2as representative examples, provide the basis for applied testconditions. Modifications in procedure or sample si
15、ze, or both,of existing standards may have to be made to provide forresistance measurement and to meet variability index require-ments that a user may specify.5.3 This practice accommodates the use of multiple testmethods, as may be required to assure satisfactory performancein a given application.6
16、. Performance Classification6.1 The performance classification statement consists ofthree letters in sequence indicating, respectively, category ofcontact (signal or power), average initial contact resistance,and change of average contact resistance as a consequence ofthe applied test conditions.6.2
17、 For this standard classification method, the performanceof a connection system for power applications is expressed asthe ratio of the contact resistance to the equivalent resistance ofthe attached conductor. The equivalent resistance of the con-ductor is the resistance of a length of solid circular
18、 conductorexactly one diameter in length. The conductor size used for theevaluation shall be that which is normally specified or utilizedwith the particular connection system being evaluated.6.2.1 For connection systems involving solid circular con-ductors, the equivalent resistance Rdis calculated
19、according tothe formula:Rd5 R 3 Dwhere:Rd= equivalent resistance,R = resistance per unit length, V, andD = diameter of conductor (in same length unit).6.2.1.1 Appendix X1 provides representative nominal datafor some common sizes of copper and aluminum conductors ofcircular cross section for the purp
20、ose of establishing instru-mentation requirements.6.2.2 For conductors with other than solid circular crosssection, equivalent diameter based on actual conductive cross-section area shall be used. For example: a conductor ofrectangular cross section 0.5 by 6 mm has a cross-section areaequal to that
21、of a solid circular conductor 1.95 mm in diameter,and therefore D in the equation in 6.2.1 is 1.95 mm.6.2.3 For contacts incorporating or connecting conductorsof different materials or cross section, or both, the Rdvalueused for contact performance determination shall be based onthe conductor of min
22、imum resistance per unit length.6.2.4 For contacts involving a connector, the conductormaterial and cross section used for determination of the Rdvalue to be used shall be the wire, busbar, circuit boardconductive strip, or other, as appropriate for the rating orrepresentative application of the con
23、nector. The conductor sizemay be determined according to the connector manufacturersspecification, current rating, or conventional application prac-tice.6.2.5 Conductor resistance per unit length is preferablydetermined by measurements incorporating the same instru-mentation used for contact resista
24、nce measurements, at thesame ambient temperature and current as for the contactperformance test being applied.6.2.6 When conductor resistance is determined at the sametime as contact performance in accordance with 6.2.5, and theconductor is solid with circular cross section, potential dropmeasuremen
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