1、Designation:D265620Standard Specification forCrosslinked Polyethylene Insulation for Wire andCable Rated 2001 to 35 000 V1This standard is issued under the fixed designation D2656;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y
2、ear 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.Scope*1.1 This specification covers a crosslinked polyethyleneinsulation for electrical wires and cables for conductor sizes8
3、 AWG(8.37 mm2)and larger.The base polymer of thisinsulation consists substantially of polyethylene.1.2 This type of insulation is suitable for use on powercables in wet and dry locations at conductor temperatures notexceeding 90 C for continuous operation,130 C for emer-gency overload conditions,and
4、 250 C for short-circuit con-ditions.It is considered suitable for all sizes and voltageclassifications of single-and multiple-conductor power cablesat voltage ratings of 2001 to 35 000 V phase-to-phase at the100%insulation level and at voltage ratings of 2001 to25 000 V at the 133%insulation level
5、as listed in Table 1C ofTest Methods D470.1.3 Materials covered by this specification are not sunlight-and weather-resistant unless they are carbon black pigmentedor contain an additive system designed for this protection.1.4 In many instances the insulation cannot be tested unlessit has been formed
6、 around a conductor.Therefore,tests aredone on insulated wire in this standard solely to determine therelevant property of the insulation and not to test the conductoror completed cable.1.5 Whenever two sets of values are stated,in differentunits,the values in the first set are regarded as standard,
7、whilethe values in parentheses are provided for information only andare not considered standard.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International St
8、andards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and CableD1248 Specification for Polyethylene Plastics ExtrusionMaterials fo
9、r Wire and CableD1711 Terminology Relating to Electrical InsulationD2765 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene Plastics2.2 ICEA Standard:3ICEA T-28-562 Test Method for Measurement of Hot Creepof Polymeric Insulation2.3 UL Standard:4UL 2556 Wire and Cabl
10、e Test Methods3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification referto Terminology D1711.4.Physical Properties4.1 The requirements for the insulation are listed in Table 1.5.Electrical Requirements5.1 Order of TestingPerform the partial-discharge,acvoltage,insul
11、ation resistance,and dc voltage tests in that orderwhen any of these tests are specified.The sequence for othertesting is not specified.5.2 Partial Discharge(Corona)Extinction VoltageEachlength of completed power cable with shielded conductorsshall comply with the minimum level specified in Table 2.
12、Conduct the tests in accordance with Test Methods D470.1This 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 Oct.1,2020.Pu
13、blished October 2020.Originallyapproved in 1967.Last previous edition approved in 2013 as D2656 13.DOI:10.1520/D2656-20.2For 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 t
14、he standards Document Summary page onthe ASTM website.3Available from The Insulated Cable Engineers Association,Inc.(ICEA),P.O.Box 1568,Carrollton,GA 30112,http:/.4Available from Underwriters Laboratories(UL),2600 N.W.Lake Rd.,Camas,WA 98607-8542,http:/.*A Summary of Changes section appears at the e
15、nd of this standardCopyright 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 for theDevelo
16、pment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.15.3 AC Voltage TestSubject the wires and cables to an actest voltage for a period of 5 min.Unless otherwise specified,omit this test if the dc voltage test described in 5.5 is to beperformed.Test at a voltage of 125 V/mil(5 kV/mm)based onthe specified nominal thickness of insulation for the ratedcircuit voltage,phase to phase.Conduct the test in accordance
