1、Designation: D2308 07 (Reapproved 2013) An American National StandardStandard 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 adop
2、tion or, in the case of revision, the 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 3
3、5 kV wire and cable, of at least 0.030 in. (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 thisspecificati
4、on are solely to determine the relevant property 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. Refere
5、nced Documents2.1 ASTM Standards:2D1248 Specification 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 f
6、or Wire and CableD3349 Test Method for Absorption 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
7、of), nexposure of materials to air at 100C for either 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 requir
8、ements to Class Cmaterials. The requirements of Specification 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 S
9、pecimens removed from the wire or cable and tested at20 to 28 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
10、to the requirements for Grade E5 as specified inTable 3 of Specification 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 suffic
11、e.5. Electrical Properties5.1 The polyethylene jacket shall conform 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
12、 in accor-dance with Test Methods D2633.7.2 Environmental Stress-Cracking 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 Ins
13、ulating Materials and is the direct responsibility ofSubcommittee D09.18 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 ap
14、proved in 2007 as D2308 07. DOI:10.1520/D2308-07R13.2For 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 the standards Document Summary page onthe ASTM website.Copyright
15、 ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.3 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 the
16、requirements of this specification.8.2 If any specimen fails to pass these tests, the length 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
17、. 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 spec
18、ification.8.3 Failure of any specimen shall not preclude resamplingand retesting the length of cable from which the originalspecimen was taken.9. Keywords9.1 absorption coefficient; environmental stress-cracking;heat distortion; polyethylene jacket; surface resistance; ther-moplastics PE jacket; U-b
19、end dischargeASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of suc
20、h rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for addit
21、ional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the
22、 ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the
23、aboveaddress or at 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 ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Physical PropertiesUnaged Requirements:Tensile
24、Strength, min, psi (MPa) 1400 (9.7)Elongation at Rupture, min, % 350Aged Requirements:After Air oven aging at 1001Cfor48h(Grade E5) or 24 h (Grade J3):Tensile Strength, min, psi (MPa) 1050 (7.3)Elongation at Rupture, min, % 265Absorption Coefficient, min, absorbance/m 320Heat Distortion at 90 1 C, max, % 25TABLE 2 Requirements for Surface Resistivity and U-BendDischargeSurface Resistivity, min, MQ 200 000U-Bend discharge at 125 V/mil (4.9 kV/mm) No failures or cracksD2308 07 (2013)2
