1、Designation:D265613Standard 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 sizes
3、8AWG(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 to 25 000V at the 133%insulation level
5、as listed in Table 1C of TestMethods 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 presented,in differentunits,the values in the first set are the standard,while
7、 those inparentheses are for information only.2.Referenced Documents2.1 ASTM Standards:2D470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and CableD1248 Specification for Polyethylene Plastics ExtrusionMaterials for Wire and CableD1711 Terminology Relating to Electrical InsulationD27
8、65 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene Plastics2.2 ICEA Standard:ICEA T-28-562 Test Method for Measurement of Hot Creepof Polymeric Insulation33.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification referto Terminology D
9、1711.4.Physical Properties4.1 The requirements for the insulation are listed in Table 1.5.Electrical Requirements5.1 Order of TestingPerform the partial-discharge,acvoltage,insulation resistance,and dc voltage tests in that orderwhen any of these tests are specified.The sequence for othertesting is
10、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.Conduct the tests in accordance with Test Methods D470.5.3 AC Voltage TestSubject the wires and cables to an actest voltag
11、e 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 accordancewith Test
12、 Methods D470.5.4 Insulation ResistanceThe insulated conductor shallhave an insulation resistance equal to or greater than thatcorresponding to a constant of 20 000 at 60 F(15.6 C).When the temperature of the water in which the insulation istested differs from 60 F,apply a correction factor.Table 2
13、of1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.18 on Solid Insulations,Non-Metallic Shieldings and Coveringsfor Electrical and Telecommunication Wires and Cables.Current editio
14、n approved Nov.1,2013.Published November 2013.Originallyapproved in 1967.Last previous edition approved in 2006 as D2656 06.DOI:10.1520/D2656-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volu
15、me information,refer to the standards Document Summary page onthe ASTM website.3Available from The Insulated Cable Engineers Association,Inc.(ICEA),P.O.Box 1568,Carrollton,GA 30112,http:/.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Dr
16、ive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Test Methods D470 contains the correction factors.Eachinsulation manufacturer can furnish the 1 F coefficient for theinsulation material by using the procedure given in TestMethods D470.Multiply the measured value by the correctionfactor to obtain the insulation-resistance value corrected to 60F.5.4.1 Where a nonconducting separator is applied betweenthe conductor and insulation or where an insulated conductor iscovered with a nonmet
