1、Designation:D424614(Reapproved 2020)Standard Specification forOzone-Resistant Thermoplastic Elastomer Insulation forWire and Cable,90 C Operation1This standard is issued under the fixed designation D4246;the number immediately following the designation indicates the year oforiginal adoption or,in th
2、e 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.1.Scope1.1 This specification covers an ozone-resistant insulatingcompound for electrical wire and cabl
3、es 14 AWG and larger.This compound consists substantially of a thermoplastic elas-tomer.1.2 This type of insulation is considered suitable for con-tinuous operation at conductor temperatures not exceeding90 C in dry locations.Operating voltages are not to exceed2000 V.The minimum installation temper
4、ature is 40 C.1.3 In many instances the insulation material cannot betested unless it has been formed around a conductor or cable.Therefore,tests are done on insulated wire or cable in thisspecification solely to determine the relevant property of theinsulation material and not to test the conductor
5、 or completedcable.1.4 Whenever two sets of values are presented,in differentunits,the values in the first set are to be regarded as standard.The values given in parentheses are mathematical conversionsthat are provided for information only and are not consideredstandard.1.5 This international stand
6、ard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Refere
7、nced Documents2.1 ASTM Standards:2D470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and CableD1711 Terminology Relating to Electrical InsulationD2633 Test Methods for Thermoplastic Insulations andJackets for Wire and Cable3.Terminology3.1 Definitions:3.1.1 For definitions of terms us
8、ed in this specification referto Terminology D1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging(act of),nthe exposure of materials to air at121 C for 168 h.4.Physical Properties4.1 Requirements for physical properties are listed in Table1.4.2 Thickness of InsulationTable 1(a)(Condu
9、ctor Sizes,Insulation Thicknesses,and AC Test Voltages for RubberInsulations)of Test Methods D470 lists the minimum averagethickness for the insulation.The required minimum thicknessis 90%of the specified average thickness.5.Electrical Requirements5.1 Order of TestingPerform the ac voltage,insulatio
10、nresistance,and dc voltage tests in that order when any of thesetests are specified.The sequence of other testing is notspecified.5.2 AC Voltage TestUnless otherwise specified,omit thistest if the dc voltage test described in 5.4 is to be performed.Test each insulated conductor for 5 min at the ac v
11、oltage givenin Table 1(a)(Conductor Sizes,Insulation Thicknesses,andAC Test Voltages for Rubber Insulations)of Test MethodsD470,under the columns labeled“Ozone-resisting Insula-tions.”5.3 Insulation ResistanceThe insulated conductor shallhave an insulation resistance value of at least that correspon
12、d-ing to a constant of 10 000 at 60 F(15.6 C).5.3.1 If the water temperature at the time measurement wasmade differs from 60 F(15.6 C),correct the insulationresistance to 60 F.Table 2(Temperature Correction Factorsfor Insulation Resistance at 60 F)of Test Methods D470contains the correction factors.
13、Each insulation manufacturer1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Electrical Insulating Materials.Current edition approved Aug.1,2020.Published September 2020.Orig
14、inallyapproved in 1983.Last previous edition approved in 2014 as D4246 14.DOI:10.1520/D4246-14R20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document
15、Summary page onthe ASTM website.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 Principles
16、for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1can furnish the 1 F coefficient for the insulation material byusing the procedure given in Test Methods D470.Multiply themeasured value by the correction factor to obtain the insulationresistance value corrected to 60 F.5.3.2 If the insulated conductor is covered with a non-metallic sheath so that the insulation resistance can be mea-sured onl
