1、Designation: D4246 02 (Reapproved 2010)D4246 14Standard Specification forOzone-Resistant Thermoplastic Elastomer Insulation ForWire and Cable, 90 C 90C Operation1This standard is issued under the fixed designation D4246; 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 () indicates an editorial change since the last revision or reapproval.1. Scope Scope*1.1 This specification covers an ozone-resistant insulating compo
3、und for electrical wire and cables 14 AWG and larger. Thiscompound consists substantially of a thermoplastic elastomer.1.2 This type of insulation is considered suitable for continuous operation at conductor temperatures not exceeding 90 C 90Cin dry locations. Operating voltages are not to exceed 20
4、00 V. The minimum installation temperature is 40 C.is -40C.1.3 Whenever two sets of values are presented, in different units, 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 be tested unless it has
5、been formed around a conductor or cable. Therefore,tests are done on insulated wire or cable in this specification solely to determine the relevant property of the insulation materialand not to test the conductor or completed cable.2. Referenced Documents2.1 ASTM Standards:2D470 Test Methods for Cro
6、sslinked Insulations and Jackets for Wire and CableD1711 Terminology Relating to Electrical InsulationD2633 Test Methods for Thermoplastic Insulations and Jackets for Wire and Cable3. Terminology3.1 Definitions: DefinitionsFor definitions of terms used in this specification refer to Terminology D171
7、1.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging (act of), nthe exposure of materials to air at 121 C 121C for 168 h.4. Physical Properties4.1 Requirements for physical properties are listed in Table 1.4.2 Thickness of InsulationTable 1(a), (Conductor Sizes, Insulation Thicknesses, a
8、nd AC Test Voltages for RubberInsulations) of Test Methods D470 lists the minimum average thickness for the insulation. The required minimum thickness is90 % of the specified average thickness.5. Electrical Requirements5.1 Order of TestingPerform the ac voltage, insulation resistance, and dc voltage
9、 tests in that order when any of these testsare specified. The sequence of other testing is not specified.5.2 AC Voltage TestUnless otherwise specified, omit this test if the dc voltage test described in 5.4 is to be performed. Testeach insulated conductor for 5 min at the ac voltage given in Table
10、1(a) (Conductor Sizes, Insulation Thicknesses, and AC TestVoltages, for Rubber Insulations) of Methods D470, under the columns labelledlabeled “Ozone-Resisting Insulations.”1 This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is t
11、he direct responsibility of SubcommitteeD09.18 on Solid Insulations, Non-Metallic Shieldings and Coverings for Electrical and Telecommunication Wires and Cables.Current edition approved March 1, 2010Nov. 1, 2014. Published August 2010November 2014. Originally approved in 1983. Last previous edition
12、approved in 20022010as D4246D4246 02 (2010).02. DOI: 10.1520/D4246-02R10.10.1520/D4246-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summ
13、ary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends
14、 that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, We
15、st Conshohocken, PA 19428-2959. United States15.3 Insulation ResistanceThe insulated conductor shall have an insulation resistance value of at least that corresponding toa constant of 10 000 at 60 F (15.6 C).60F (15.6C).5.3.1 If the water temperature at the time measurement was made differs from 60
16、F (15.6 C), 60F (15.6C), correct theinsulation resistance to 60 F. 60F. Table 2,2 (Temperature Correction Factors for Insulation Resistance at 60 F) 60F) of TestMethods D470 contains the correction factors. Each insulation manufacturer can furnish the 1F coefficient for the insulationmaterial by usi
17、ng the procedure given in Test Methods D470. Multiply the measured value by the correction factor to obtain theinsulation resistance value corrected to 60F.5.3.2 If the insulated conductor is covered with a non-metallic sheath so that the insulation resistance can be measured only onthe completed as
18、sembly, the required insulation resistance shall be at least 60 % of that required for the primary insulation basedon the thickness of that insulation.5.4 DC Voltage TestUnless otherwise specified, omit this test if the ac voltage test described in 5.2 has been performed. Aftercompletion of the insu
19、lation resistance test, test each insulated conductor for 5 min at the dc test voltage given in Table number1(b) (Conductor Sizes, and DC Test Voltages for Rubber Insulations) of Test Methods D470, under the columns labelledlabeled“Ozone-Resisting Insulations.”6. Cold Bend6.1 The insulation shall no
20、t show any cracks when tested at a temperature of 55 C of -55C, in accordance with the procedureand Table 7 (Mandrel Diameters for Cold Bend Test) in Test Methods D470.7. Ozone7.1 The insulation shall show no cracking or surface checking visible to the unaided eye after exposure to an ozoneconcentra
21、tion of not less than 0.0250.025, nor more than 0.030 % by volume, when tested in accordance with Test Methods D470.8. Heat Distortion8.1 The insulation shall meet the requirements in Table 1 when tested in accordance with the procedure in Methods D2633.9. Sampling9.1 Unless otherwise instructed, sa
22、mple the insulation in accordance with Test Methods D470.10. Test Methods10.1 Unless otherwise instructed, test the insulation in accordance with Test Methods D470.11. Keywords11.1 90C insulation; ac voltage test; dc voltage test; insulation; insulation resistance; 90 C insulation; ozone-resistant;t
23、hermoplastic elastomer; thermoplasatic elastomer insulationTABLE 1 Requirements for Physical PropertiesUnaged Requirements:Tensile strength, min, psi (MPa) 1000 (6.9)Elongation at rupture, min, % 300Aged Requirements(after air oven test at121 1 C for 168 h):Aged Requirements(after air oven test at12
24、1 1C for 168 h):Tensile strength and elongation, at rupture min, % ofunaged value75Heat Distortion (at 150 1 C, max, % of unaged value):Heat Distortion (at 150 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)5
25、0Larger than 4/0 AWG (107 mm2) (buffed, planed, or skivedsample ofinsulation)50D4246 142SUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this standard since the last issue (D4246 02(2010) that may impact the use of this standard. (Approved Nov. 1, 2014.)(1) Revised
26、Table 1.(2) Revised 5.2.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 infringe
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