1、Designation: D2655 12Standard 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. Scope1.1 This specification covers a crosslinked polyethyleneinsulation for electrical wires and cables in conductor siz
3、es 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 temperatur
4、es 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.1
5、.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 are
6、 presented, in differentunits, the values in the first set are the standard, while 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 Extrusio
7、nMaterials 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 Insulations33. Terminology3.1 Defini
8、tions: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 Properties4.1 The requirements for the insulation are listed in Table 1.5. Ele
9、ctrical Requirements5.1 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 TestSubject wires and cables to an ac testvoltage for a period of 5 min. Unless
10、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. Conduct the tests in accordancewith Test Methods D470.5.3 Insulatio
11、n ResistanceThe insulated 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
12、the correction factors. Each insulationmanufacturer can furnish the 1F coefficient for the insulationmaterial by using the procedure given in Test Methods D470.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct respo
13、nsibility ofSubcommittee D09.07 on Electrical Insulating Materials.Current edition approved Jan. 1, 2012. Published February 2012. Originallyapproved in 1967. Last previous edition approved in 2006 as D2655 00 (2006).DOI: 10.1520/D2655-12.2For 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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Multiply the measured value by the correction factor to obtainthe insulation-resistance value corrected to 60F.5.3.1 Where a nonconducting
16、separator is applied betweenthe 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 insul
17、ation based on the nominalthickness 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 te
18、st if the ac voltage test described in 5.2 has beenperformed.5.5 Accelerated Water Absorption RequirementsThe insu-lation shall meet the requirements of Table 2 when tested inaccordance with theAccelerated WaterAbsorption Tests in TestMethods D470. Conduct the Electrical Method Test at 60 Hzwith the
19、 water temperature at 75 6 1C.6. Heat Distortion6.1 The requirements for heat distortion are given in Table1 of this specification. The test is conducted in accordance withTest Methods D470.7. Percent Hot Creep and Percent Hot Set7.1 Determine the percent hot creep for 15 min at 150C302F as follows:
20、 Meet the filled or unfilled values specifiedin Table 1. Conduct this test in accordance with Practice ICEAT-28-562.7.2 Determine the percent hot set for 5 min at 150C302F as follows: Meet the filled or unfilled values specifiedin Table 1. Conduct this test in accordance with Practice ICEAT-28-562.7
21、.3 In case of dispute, the solvent extraction test in TestMethod D2765 is to be the referee method. The extractables,after a drying time of 20 h, shall be no more than 30 %.8. Test Applicable for Sunlight and Weather ResistantMaterials8.1 For insulations requiring sunlight- and weather-resistance te
22、sting, test in accordance with “Weatherability forColored Materials (including white and black)” in Specifica-tion D1248. Prepare the specimens in accordance with TestMethods D470 for physical tests of insulations and jackets.9. Sampling9.1 Unless otherwise instructed, sample the insulation inaccord
23、ance with Test Methods D470.10. Test Methods10.1 Unless otherwise instructed, test the insulation inaccordance with Test Methods D470.11. Keywords11.1 ac voltage; crosslinked polyethylene; dc voltage; heatdistortion; hot creep; hot set; insulation resistance; waterabsorption; weather resistantASTM I
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28、610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Physical Properti
29、es for Crosslinked PolyethyleneInsulationUnaged Requirements:Tensile strength, min, psi MPa 1800 12.4Elongation at rupture, min, % 250Aged Requirements:After Air Oven Test at 121 1C for 168 h:Tensile strength, min, % of unaged value 75Elongation at rupture, min, % of unaged value 75Heat Distortion:A
30、t 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) 15Percent Hot CreepFilledUnfilled100175Percent Hot SetFilled 5Unfilled 10TABLE 2 Accelerated Water Absorption Test RequirementsElectrical Method:Permittivity 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 122
