1、Designation: D2655 17Standard Specification forCrosslinked Polyethylene Insulation for Wire and CableRated 0 to 2000 V1This standard is issued under the fixed designation D2655; 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 in conductor si
3、zes 14AWG 2.08 mm2 and larger. The base polymer of thisinsulation consists substantially of polyethylene or a polyeth-ylene copolymer.1.2 This type of insulation is suitable for continuous use onpower cables in wet and dry locations, for voltage ratings notexceeding 2000 V and at conductor temperatu
4、res not exceeding90C for normal operation. For copper conductors, the insula-tion can be applied over the uncoated metal.1.3 Materials covered by this specification are not sunlightand weather resistant unless they are carbon black pigmentedor contain an additive system designed for this protection.
5、1.4 In many instances the insulation cannot be tested unlessit has been formed 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 ar
6、e presented, in differentunits, the values in the first set are the standard, while those inparentheses are for information only.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for t
7、heDevelopment of International Standards, 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 Polyet
8、hylene Plastics ExtrusionMaterials for Wire and CableD1711 Terminology Relating to Electrical InsulationD2765 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 Insulations3
9、3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification referto Terminology D1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging (act of), nexposure of materials to air at121C for 168 h.4. Physical Properties Requirements4.1 The requirements for the in
10、sulation are listed in Table 1.4.2 Tensile Strength and Percent Elongation at Rupture:4.2.1 The test is conducted in accordance with Test MethodD470. The requirements for tensile strength and elongation aregiven in Table 1 of this Specification.4.3 Heat Distortion:4.3.1 The test is conducted in acco
11、rdance with Standard TestMethods D0470. The requirements for heat distortion are givenin Table 1 of this specification.4.4 Percent Hot Creep and Percent Hot Set:4.4.1 Conduct these test in accordance with Test MethodICEA T-28-562.4.4.2 Determine the percent hot creep for 15 min at 150C(302F). Meet t
12、he filled or unfilled values specified in Table 1.4.4.3 Determine the percent hot set for 5 min at 150C(302F). Meet the filled or unfilled values specified in Table 1.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direc
13、t responsibility ofSubcommittee D09.07 on Electrical Insulating Materials.Current edition approved Nov. 1, 2017. Published November 2017. Originallyapproved in 1967. Last previous edition approved in 2012 as D2655 12. DOI:10.1520/D2655-17.2For referenced ASTM standards, visit the ASTM website, www.a
14、stm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Insulated Cable Engineers Association, P. O. Box 440, SouthYarmouth, MA 02664 or Global Engineering Docume
15、nts, 15 Inverness Way East,Englewood, CO 80112.*A Summary of Changes section appears at the end 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 internationall
16、y recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.14.4.4 Determination of gel content is the reference TestM
17、ethod in case of a dispute, and the test is conducted inaccordance with Standard Test Method D2765. Meet thepercent extractable requirements specified in Table 1.4.5 Test Applicable for Sunlight and Weather ResistantMaterials:4.5.1 Test in accordance with “Weatherability for ColoredMaterials (includ
18、ing white and black)” in Specification D1248.Prepare the specimens in accordance with Test Methods D0470for physical tests of insulations and jackets (physical testprocedures section). THE SPECIMENS SHALL MEET THEREQUIREMENTS FOR CLASS C OR CLASS D IN SPECI-FICATION D1248.5. Electrical Requirements5
19、.1 Order of TestingPerform the ac voltage, insulationresistance, and dc voltage tests in that order when any of thesetests are required. The sequence for other testing is notspecified.5.2 AC Voltage TestConduct the tests in accordance withTest Methods D470. Subject wires and cables to an ac testvolt
20、age for a period of 5 min. Unless otherwise specified, omitthis test if the dc voltage test described in 5.4 is to beperformed. Test at a voltage of 100 V/mil 4 kV/mm based onthe specified nominal thickness of insulation for the ratedcircuit voltage, phase to phase.5.3 Insulation ResistanceThe insul
21、ated conductor shallhave an insulation resistance equal to or greater than thatcorresponding to a constant of 10 000 at 60F 15.6C. Whenthe temperature of the water in which the insulation is testeddiffers from 60F, apply a correction factor. Table 2 of TestMethods D470 contains the correction factor
22、s. Each insulationmanufacturer can furnish the 1F coefficient for the insulationmaterial by using the procedure given in Test Methods D470.Multiply the measured value by the correction factor to obtainthe insulation-resistance value corrected to 60F.5.3.1 Where a nonconducting separator is applied b
23、etweenthe conductor and insulation or where an insulated conductor iscovered with a nonmetallic jacket so that the insulationresistance can be measured only on the completed assembly,the required insulation resistance shall be at least 60 % of thatrequired for the primary insulation based on the nom
24、inalthickness of that insulation.5.4 DC Voltage TestUpon completion of the insulationresistance test, each unshielded insulated conductor shallwithstand for 5 min a dc test voltage which is three times theac test voltage specified in 5.2. Unless otherwise specified,omit this test if the ac voltage t
25、est described in 5.2 has beenperformed.5.5 Accelerated Water Absorption RequirementsTest inaccordance with theAccelerated WaterAbsorption Tests in TestMethods D0470. Conduct the Electrical Method Test at 60 Hzwith the water temperature at 75 6 1C. The insulation shallmeet the requirements of Table 2
26、.6. Sampling6.1 Unless otherwise instructed, sample the insulation inaccordance with Test Methods D470.7. Test Methods7.1 Unless otherwise instructed, test the insulation in accor-dance with Test Methods D470.8. Keywords8.1 ac voltage; crosslinked polyethylene; dc voltage; heatdistortion; hot creep;
27、 hot set; insulation resistance; sunlight andweather resistant; water absorptionTABLE 1 Physical Properties for Crosslinked PolyethyleneInsulationUnaged Tensile Properties Requirements:Tensile strength, min, psi MPa 1800 12.4Elongation at rupture, min, % 250Aged Tensile Properties Requirements:After
28、 Air Oven Test at 121 1C for 168 h:Tensile strength, min, % of unaged value 75Elongation at rupture, min, % of unaged value 75Heat Distortion Requirements:At 121 1C, max, % of unaged value:4/0 Awg 107 mm2 and smaller (insulation on cable) 30Larger than 4/0 AWG 107 mm2 (buffed sample of insulation) 1
29、5Percent Hot Creep Requirements:Filled (max %)Unfilled (max %)100175Percent Hot Set Requirements:Filled (max %) 5Unfilled (max %) 10Percent Extractable Requirement:After drying for 20 h (* referee test only *) (max) 30TABLE 2 Accelerated Water Absorption Test RequirementsElectrical Method:Permittivi
30、ty after one day, max 6.0Increase in capacitance, max, %From 1 to 14 days 3.0From 7 to 14 days 1.5Stability factor after 14 days, max 1.0D2655 172SUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this standard since the last issue(D2655 12) that may impact the use of
31、 this standard. (Approved Nov. 1, 2017.)(1) Revised Table 1.(2) Added new Subsections 4.2 4.5.(3) Revised 5.2 and 5.5.(4) Removed previous Sections68andrenumbered subse-quent sections accordingly.ASTM International takes no position respecting the validity of any patent rights asserted in connection
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