1、Designation:D230807(Reapproved 2013)Standard Specification forThermoplastic Polyethylene Jacket for Electrical Wire andCable1This standard is issued under the fixed designation D2308;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,th
2、e 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 a thermoplastic jacketing com-pound for 2 to 35 kV wire and cable,of at least 0.030 in.
3、(0.76mm)nominal thickness,consisting substantially of pigmentedpolyethylene.1.2 In many instances the jacket material cannot be testedunless it has been formed around a conductor or cable.Therefore,tests done on jacketed wire and cable in thisspecification are solely to determine the relevant proper
4、ty ofthe jacket material and not to test the jacketed conductor orcompleted cable.1.3 Whenever two sets of values are 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:2D1248 Specificat
5、ion for Polyethylene Plastics ExtrusionMaterials for Wire and CableD1693 Test Method for Environmental Stress-Cracking ofEthylene PlasticsD1711 Terminology Relating to Electrical InsulationD2633 Test Methods for Thermoplastic Insulations andJackets for Wire and CableD3349 Test Method for Absorption
6、Coefficient of EthylenePolymer Material Pigmented with Carbon Black3.Terminology3.1 Definitions:3.1.1 Refer to Terminology D1711 for definitions of termsused in this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging,(act of),nexposure of materials to air at 100C for either
7、 24 or 48 h.4.Physical Properties4.1 The polyethylene before application to the wire or cableshall comply with the requirements for Type I,Class C,Category 4 or 5,Grade E5 or J3 of Specification D1248,orClass B with equivalent weathering requirements to Class Cmaterials.The requirements of Specifica
8、tion D1248 shall notapply to the jacket removed from the wire or cable.Thecompound is suitable for exposure to sunlight and otheratmospheric environments at temperatures between 55and+75 C,and a minimum installation temperature of 40C.4.2 Specimens removed from the wire or cable and tested at20 to 2
9、8 C(68 to 82 F)shall conform to the requirements forphysical properties specified in Table 1.Alternatively,thejacket shall be air-oven aged without removal from theconductor.4.3 Environmental Stress-Cracking TestThe jacket shallconform to the requirements for Grade E5 as specified inTable 3 of Speci
10、fication D1248.4.4 Absorption CoeffcientSee Test Method D3349.In-stead of testing the jacket removed from the conductors,acertification by the polyethylene compound manufacturer thatthis requirement has been complied with shall suffice.5.Electrical Properties5.1 The polyethylene jacket shall conform
11、 to the require-ments for electrical properties specified in Table 2.6.Sampling6.1 Unless otherwise instructed,sample the jacket in accor-dance with Test Methods D2633.7.Test Methods7.1 Unless otherwise instructed,test the jacket in accor-dance with Test Methods D2633.7.2 Environmental Stress-Cracki
12、ng Test Test in accor-dance with Test Method D1693,Condition A,using undilutedIgepal CO 630 as specified in Specification D1248.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.18
13、on Solid Insulations,Non-Metallic Shieldings and Coveringsfor Electrical and Telecommunication Wires and Cables.Current edition approved March 1,2013.Published March 2013.Originallyapproved in 1964.Last previous edition approved in 2007 as D2308 07.DOI:10.1520/D2308-07R13.2For referenced ASTM standa
14、rds,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 Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-295
15、9.United States1 7.3 Absorption CoeffcientTest in accordance with TestMethod D3349.8.Retest8.1 If all of the specimens pass the test described,the lot ofcable that they represent shall be considered to meet therequirements of this specification.8.2 If any specimen fails to pass these tests,the lengt
16、h ofcable from which the specimen was taken shall be consideredas not meeting the requirements of this specification.Retestnew specimens from each of two other lengths of cable fromthe lot of cable under test.If either of the second specimensfails to pass the test,consider the lot of cable as not meeting therequirements of this specification.If both such second speci-mens pass the test,consider the lot of cable(except the lengthrepresented by the first specimen)to meet the requirements ofthis sp
