1、Designation: D4246 02 (Reapproved 2010)An American National StandardStandard Specification forOzone-Resistant Thermoplastic Elastomer Insulation ForWire and Cable, 90 C Operation1This standard is issued under the fixed designation D4246; the number immediately following the designation indicates the
2、 year oforiginal adoption 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 an ozone-resistant insula
3、tingcompound for 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 exceeding 90C in dry locations. Operating voltages are not to ex
4、ceed 2000V. The minimum installation temperature is 40 C.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
5、 formed around a conductor 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:2D470 Test Methods for Crosslink
6、ed Insulations and Jacketsfor Wire and CableD1711 Terminology Relating to Electrical InsulationD2633 Test Methods for Thermoplastic Insulations andJackets for Wire and Cable3. Terminology3.1 Definitions: For definitions of terms used in this speci-fication refer to Terminology D1711.3.2 Definition o
7、f Term Specific to This Standard.3.2.1 aging (act of), nthe exposure of materials to air at121 C for 168 h.4. Physical Properties4.1 Requirements for physical properties are listed in Table1.4.2 Thickness of InsulationTable 1(a), (Conductor Sizes,Insulation Thicknesses, and AC Test Voltages for Rubb
8、erInsulations) of Test Methods D470 lists the minimum averagethickness for the insulation. The required minimum thicknessis 90 % of the specified average thickness.5. Electrical Requirements Electrical Requirements5.1 Order of TestingPerform the ac voltage, insulationresistance, and dc voltage tests
9、 in that order when any of 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 1(a) (Con
10、ductor Sizes, Insulation Thicknesses, andAC Test Voltages, for Rubber Insulations) of Methods D470under the columns labelled “Ozone-Resisting Insulations.”5.3 Insulation ResistanceThe insulated conductor shallhave an insulation resistance value of at least that correspond-ing to a constant of 10 000
11、 at 60 F (15.6 C).5.3.1 If the water temperature at the time measurement wasmade differs from 60 F (15.6 C), correct the insulationresistance to 60 F. Table 2, (Temperature Correction Factorsfor Insulation Resistance at 60 F) of Test Methods D470contains the correction factors. Each insulation manuf
12、acturercan furnish the 1F coefficient for the insulation material byusing the procedure given in Test Methods D470. Multiply themeasured value by the correction factor to obtain the insulationresistance value corrected to 60F.5.3.2 If the insulated conductor is covered with a non-metallic sheath so
13、that the 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.1This specification is under the jurisdiction of ASTM Committee D09 onElectric
14、al and Electronic Insulating 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, 2010. Published August 2010. Originallyapproved in 1983. La
15、st previous edition approved in 2002 as D424602. DOI:10.1520/D4246-02R10.2For 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 A
16、STM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.4 DC Voltage TestUnless otherwise specified, omit thistest if the ac voltage test described in 5.2 has been performed.After completion of the insulation resistance test, t
17、est eachinsulated conductor for 5 min at the dc test voltage given inTable number 1(b) (Conductor Sizes, and DC Test Voltages forRubber Insulations) of Test Methods D470 under the columnslabelled “Ozone-Resisting Insulations.”6. Cold Bend6.1 The insulation shall not show any cracks when tested ata t
18、emperature of 55 C in accordance with the procedure andTable 7 (Mandrel Diameters for Cold Bend Test) in TestMethods D470.7. Ozone7.1 The insulation shall show no cracking or surface check-ing visible to the unaided eye after exposure to an ozoneconcentration of not less than 0.025 nor more than 0.0
19、30 % byvolume, when tested in accordance with Test Methods D470.8. Heat Distortion8.1 The insulation shall meet the requirements in Table 1when tested in accordance with the procedure in MethodsD2633.9. Sampling9.1 Unless otherwise instructed, sample the insulation inaccordance with Test Methods D47
20、0.10. Test Methods10.1 Unless otherwise instructed, test the insulation inaccordance with Test Methods D470.11. Keywords11.1 ac voltage test; dc voltage test; insulation; insulationresistance; 90 C insulation; ozone-resistant; thermoplasticelastomer; thermoplasatic elastomer insulationASTM Internati
21、onal 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 entirely thei
22、r 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 standardsand should b
23、e 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 Committee on Standard
24、s, 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 or at 610-832-
25、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 Requirements for Physical PropertiesUnaged Requirements:Tensile strength,
26、min, psi (MPa) 1000 (6.9)Elongation at rupture, min, % 300Aged Requirements (after air oven test at121 6 1 C for 168 h):Tensile strength and elongation, at rupture min, % ofunaged value75Heat Distortion (at 150 6 1 C, max, % of unaged value):4/0 AWG (107 m2) and smaller (insulation on cable) 50Larger than 4/0 AWG (107 mm2) (buffed sample ofinsulation)50D4246 02 (2010)2
