1、Designation:B81218Standard Test Method forResistance to Environmental Degradation of ElectricalPressure Connections Involving Aluminum and Intended forResidential Applications1This standard is issued under the fixed designation B812;the number immediately following the designation indicates the year
2、 oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONElectrical pressure connection systems involving aluminum are
3、those in which one or more of thecomponents of the system in the direct electrical path or carrying any electrical current is fabricatedof aluminum,including aluminum wires,aluminum bus bars,aluminum bolts,aluminum terminations,or any other aluminum current-carrying member.Included are systems which
4、 must carry current forsafety purposes such as ground shields or straps attached to aluminum framing or other structuralmembers.Pressure connection systems can be evaluated by this test method.Such systems arecomprised of the wire or other structure being connected and the means of connection,any el
5、ementof which is made of aluminum.Connection systems tested are exposed sequentially to ambients of high relative humidity andtemperature cycles of 75C,such as may be encountered by some connections in actual residentialapplications.Periodic observation of the potential drop across the connection in
6、terfaces while carryingrated current provides a measurement of connection performance.1.Scope1.1 This test method covers all residential pressure connec-tion systems.Detailed examples of application to specific typesof connection systems,set-screw neutral bus connectors andtwist-on wire-splicing con
7、nectors,are provided in AppendixX1 and Appendix X2.1.2 The purpose of this test method is to evaluate theperformance of residential electrical pressure connection sys-tems under conditions of cyclic temperature change(withinrating)and high humidity.1.3 The limitations of the test method are as follo
8、ws:1.3.1 This test method shall not be considered to confirm aspecific lifetime in application environments.1.3.2 The applicability of this test method is limited topressure connection systems rated at or below 600 V d-c or a-cRMS.1.3.3 This test method is limited to temperature and watervapor expos
9、ure in addition to electrical current as required tomeasure connection resistance.1.3.4 This test method does not evaluate degradation whichmay occur in residential applications due to exposure of theelectrical connection system to additional environmental con-stituents such as(but not limited to)th
10、e following examples:1.3.4.1 Household chemicals(liquid or gaseous)such asammonia,bleach,or other cleaning agents.1.3.4.2 Chemicals as may occur due to normal hobby orprofessional activities such as photography,painting,sculpture,or similar activities.1.3.4.3 Environments encountered during construc
11、tion orremodeling such as direct exposure to rain,uncured wetconcrete,welding or soldering fluxes and other agents.1.3.5 This test method is limited to evaluation of pressureconnection systems.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It i
12、s theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateSafety Data Sheet(SDS)for this product/material as providedby the manufacturer,to establish appropriate safety,health,and environmental practices,and determine the applica
13、bilityof regulatory limitations prior to use.1.5 This standard should be used to measure and describethe properties of materials,products,or assemblies in responseto electrical current flow under controlled laboratory condi-tions and should not be used to describe or appraise the fire1This test meth
14、od is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.11 on Electrical Contact Test Methods.Current edition approved Nov.1,2018.Published December 2018.Originallyapproved in 1990.Last previous edition approved in 2013 as
15、 B812 96(2013).DOI:10.1520/B0812-18.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Princip
16、les for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 hazard or fire risk of materials,products,or assemblies underactual installation conditions or under actual fire conditions.However,results of this test may be used as elements of a firerisk assessment which takes into account all of the factorswhich are pertinent to an assessment of the fire hazard of aparticular end use.1.6 This interna