1、Designation: D 4246 02An American National StandardStandard Specification forOzone-Resistant Thermoplastic Elastomer Insulation ForWire and Cable, 90C Operation1This standard is issued under the fixed designation D 4246; the number immediately following the designation indicates the year oforiginal
2、adoption or, in the case 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. Scope1.1 This specification covers an ozone-resistant insulatingcompound for
3、 electrical wire and cables 14 AWG and larger.This compound consists substantially of a thermoplastic elas-tomer.1.2 This type of insulation is considered suitable for con-tinuous operation at conductor temperatures not exceeding90C in dry locations. Operating voltages are not to exceed2000 V. The m
4、inimum installation temperature is 40C.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.1.4 In many instances the insulation material cannot betested unless it has been formed around a c
5、onductor or cable.Therefore, tests are done on insulated wire or cable in thisspecification solely to determine the relevant property of theinsulation material and not to test the conductor or completedcable.2. Referenced Documents2.1 ASTM Standards:D 470 Test Methods for Crosslinked Insulations and
6、 Jacketsfor Wire and Cable2D 1711 Terminology Relating to Electrical Insulation2D 2633 Methods of Testing Thermoplastic Insulations andJackets for Wire and Cable33. Terminology3.1 Definitions: For definitions of terms used in this speci-fication refer to Terminology D 1711.3.2 Definition of Term Spe
7、cific to This Standard.3.2.1 aging (act of), nthe exposure of materials to air at121C for 168 h.4. Physical Properties4.1 Requirements for physical properties are listed in Table1.4.2 Thickness of InsulationTable number 1(a), (Conduc-tor Sizes, Insulation Thicknesses, and AC Test Voltages forRubber
8、Insulations) of Test Methods D 470 lists the minimumaverage thickness for the insulation. The required minimumthickness is 90 % of the specified average thickness.5. Electrical Requirements5.1 Order of TestingPerform the ac voltage, insulationresistance, and dc voltage tests in that order when any o
9、f thesetests are specified. The sequence of other testing is notspecified.5.2 AC Voltage TestUnless otherwise specified, omit thistest if the dc voltage test described in 5.4 is to be performed.Test each insulated conductor for 5 min at the ac voltage givenin Table number 1(a) (Conductor Sizes, Insu
10、lation Thick-nesses, and AC Test Voltages, for Rubber Insulations) ofMethods D 470 under the columns labelled “Ozone-ResistingInsulations.”5.3 Insulation ResistanceThe insulated conductor shallhave an insulation resistance value of at least that correspond-ing to a constant of 10 000 at 60F (15.6C).
11、5.3.1 If the water temperature at the time measurement wasmade differs from 60F (15.6C), correct the insulation resis-tance to 60F. Table number 2, (Temperature CorrectionFactors for Insulation Resistance at 60F) of Test MethodsD 470 contains the correction factors. Each insulation manu-facturer can
12、 furnish the 1F coefficient for the insulationmaterial by using the procedure given in Test Methods D 470.Multiply the measured value by the correction factor to obtainthe insulation resistance value corrected to 60F.5.3.2 If the insulated conductor is covered with a non-metallic sheath so that the
13、insulation resistance can be mea-sured only on the completed assembly, the required insulationresistance shall be at least 60 % of that required for the primaryinsulation based on the thickness of that insulation.5.4 DC Voltage TestUnless otherwise specified, omit thistest if the ac voltage test des
14、cribed in 5.2 has been performed.After completion of the insulation resistance test, test eachinsulated conductor for 5 min at the dc test voltage given in1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibi
15、lity ofSubcommittee D09.18 on Solid Insulations, Non-Metallic Shieldings, and Cover-ings for Electrical and Telecommunications Wires and Cables.Current edition approved March 10, 2002. Published June 2002. Originallypublished as D 4246 83. Last previous edition D 4246 97.2Annual Book of ASTM Standar
16、ds , Vol 10.01.3Annual Book of ASTM Standards, Vol 10.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Table number 1(b) (Conductor Sizes, and DC Test Voltages forRubber Insulations) of Test Methods D 470 under the columnslabelled
17、“Ozone-Resisting Insulations.”6. Cold Bend6.1 The insulation shall not show any cracks when tested ata temperature of 55C in accordance with the procedure andTable number 7 (Mandrel Diameters for Cold Bend Test) inTest Methods D 470.7. Ozone7.1 The insulation shall show no cracking or surface check-
18、ing visible to the unaided eye after exposure to an ozoneconcentration of not less than 0.025 nor more than 0.030 % byvolume, when tested in accordance with Test Methods D 470.8. Heat Distortion8.1 The insulation shall meet the requirements in Tablenumber 1 when tested in accordance with the procedu
19、re inMethods D 2633.9. Sampling9.1 Unless otherwise instructed, sample the insulation inaccordance with Test Methods D 470.10. Test Methods10.1 Unless otherwise instructed, test the insulation inaccordance with Test Methods D 470.11. Keywords11.1 ac voltage test; dc voltage test; insulation; insulat
20、ionresistance; 90C insulation; ozone-resistant; thermoplasticelastomer; thermoplasatic elastomer insulationASTM 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 th
21、at determination of the validity of any such patent rights, and the riskof infringement of such 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 reappr
22、oved or withdrawn. Your comments are invited either for revision of this standard or for additional 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 f
23、eel that your comments have not received a fair hearing you shouldmake your views known to the 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 re
24、prints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress 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 Requirements for Physical PropertiesUnaged Requirements:Tensile st
25、rength, min, psi (MPa) 1000 (6.9)Elongation at rupture, min, % 300Aged Requirements (after air oven test at121 6 1C for 168 h):Tensile strength and elongation, at rupture min, % ofunaged value75Heat Distortion (at 150 6 1C, max, % of unaged value):4/0 AWG (107 m2) and smaller (insulation on cable) 50Larger than 4/0 AWG (107 mm2) (buffed sample ofinsulation)50D 42462
