1、Designation: D 2308 07An American National StandardStandard Specification forThermoplastic Polyethylene Jacket for Electrical Wire andCable1This standard is issued under the fixed designation D 2308; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers a thermoplastic jacketing com-pound for 2 to 35 kV wire and c
3、able, 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 thisspecification are solely t
4、o 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. Referenced Documents2
5、.1 ASTM Standards:2D 1248 Specification for Polyethylene Plastics ExtrusionMaterials for Wire and CableD 1693 Test Method for Environmental Stress-Cracking ofEthylene PlasticsD 1711 Terminology Relating to Electrical InsulationD 2633 Test Methods for Thermoplastic Insulations andJackets for Wire and
6、 CableD 3349 Test Method for Absorption Coefficient of EthylenePolymer Material Pigmented with Carbon Black3. Terminology3.1 Definitions:3.1.1 Refer to Terminology D 1711 for definitions of termsused in this specification.3.2 Definition of Term Specific to This Standard:3.2.1 aging, (act of), nexpos
7、ure 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 D 1248,orClass B with equivalent weathering requirements to
8、Class Cmaterials. The requirements of Specification D 1248 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
9、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 Test The jacket shallconform to the r
10、equirements for Grade E5 as specified inTable 3 of Specification D 1248.4.4 Absorption CoeffcientSee Test Method D 3349. 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. E
11、lectrical 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 D 2633.7. Test Methods7.1 Unless otherwise instructed, test the jacket in a
12、ccor-dance with Test Methods D 2633.7.2 Environmental Stress-Cracking TestTest in accor-dance with Test Method D 1693, Condition A, using undilutedIgepal CO 630 as specified in Specification D 1248.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insula
13、ting 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 May 1, 2007. Published June 2007. Originallyapproved in 1964. Last previous edition approved
14、 in 2002 as D 2308 02.2For 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.1*A Summary of Changes section appears
15、at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.3 Absorption CoeffcientTest in accordance with TestMethod D 3349.8. Retest8.1 If all of the specimens pass the test described, the lot ofcable that they rep
16、resent shall be considered to meet therequirements 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
17、 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
18、) to meet the requirements ofthis specification.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 resi
19、stance; ther-moplastics PE jacket; U-bend dischargeSUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this specification since the last issue,D 2308 02, that may impact the use of this specification. (Approved May 1, 2007)(1) Revised Sections 1, 3, and 4, and Table 1.
20、ASTM 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 such rights, are
21、 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 additional standar
22、dsand 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 ASTM Committ
23、ee 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 aboveaddress
24、or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Physical PropertiesUnaged Requirements:Tensile Strength, min, psi (MPa) 1400 (9.7)Elongation at Rupture, min, % 350Aged Requirements:After Air oven aging at 100 6 1Cfor48h(G
25、rade 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 6 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 cracksD2308072
