1、Designation: D2633 08 D2633 12 An American National StandardStandard Test Methods forThermoplastic Insulations and Jackets for Wire and Cable1This standard is issued under the fixed designation D2633; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、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*1.1 These test methods cover procedures for the testing of thermoplastic insulations and ja
3、ckets used on insulated wire andcable. To determine the test to be made on the particular insulation or jacket compound, refer to the product specification for thattype. These test methods do not apply to the class of products known as flexible cords. The electrical tests on insulation andwater-abso
4、rption tests do not apply to the class of products having a separator between the conductor and the insulation.1.2 These test methods pertain to insulation or jacket material for electrical wires and cables. In many instances the insulationor jacket material cannot be tested unless it has been forme
5、d around a conductor or cable. Therefore, tests are done on insulatedor jacketed wire or cable in these test methods solely to determine the relevant property of the insulation or jacket material andnot to test the conductor or completed cable.1.3 Whenever two sets of values are presented, in differ
6、ent units, the values in the first set are the standard, while those inparentheses are for information only.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety
7、and health practices and determine the applicability of regulatorylimitations prior to use. For specific hazards see Sections 4 and 63.1.5 The procedures appear in the following sections:Procedure SectionsCold Bend Test 75 to 77Dielectric Strength Retention Test 45 to 51Electrical Tests of Insulatio
8、n 17 to 29Heat Distortion Test 74Heat Shock Test 73Insulation Resistance Test 30 to 37Partial-Discharge Extinction Level Test 38 to 44Physical Tests of Insulation and Jackets 5 to 16Surface Resistivity Test 64 to 67Thermal Tests 72 to 77Track Resistance Test 78 to 81U-Bend Discharge Test 68 to 71Ver
9、tical Flame Test 63Water Absorption Tests, Accelerated 52 to 622. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials atCommercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and
10、 Permittivity (Dielectric Constant) of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance of Insulating MaterialsD374 Test Methods for Thickness of Solid Electrical InsulationD471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in a
11、n Air OvenD638 Test Method for Tensile Properties of Plastics1 These methods are under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and are the direct responsibility of SubcommitteeD09.18 on Solid Insulations, Non-Metallic Shieldings and Coverings for Elec
12、trical and Telecommunication Wires and Cables.Current edition approved May 15, 2008Nov. 1, 2012. Published June 2008November 2012. Originally approved in 1967. Last previous edition approved in 20022008 asD2633 02.D2633 08. DOI: 10.1520/D2633-08.10.1520/D2633-12.2 For referenced ASTM standards, visi
13、t the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM stand
14、ard 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 that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM
15、 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, West Conshohocken, PA 19428-2959. United States1D1711 Terminology Relating to Electrical InsulationD1248 Specification for Pol
16、yethylene Plastics Extrusion Materials for Wire and CableD2132 Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating MaterialsD3755 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials UnderDirect-Voltage Stress
17、D5025 Specification for Laboratory Burner Used for Small-Scale Burning Tests on Plastic MaterialsD5207 Practice for Confirmation of 20mm (50W) and 125mm (500W) Test Flames for Small-Scale Burning Tests onPlastic MaterialsD5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of El
18、ectrical InsulationE29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications2.2 Federal Standard:Federal Specification for Tape; Paper, Gummed (Kraft) (PPP-T-45D)32.3 ICEA Standard:T-24-380 Guide for Partial-Discharge Procedure43. Terminology3.1 Definitions:
19、 For definitions of terms used in these test methods, refer to Terminology D1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging (act of), nexposure of material to air or oil at a temperature and a time as specified in the relevant materialspecification for that material.3.3 Symbols:3
20、.3.1 kcmil = thousands of circular mils.4. Hazards4.1 High Voltage:4.1.1 WarningLethal voltages are a potential hazard during the performance of this test. It is essential that the test apparatus,and all associated equipment electrically connected to it, be properly designed and installed for safe o
21、peration. Solidly ground allelectrically conductive parts which it is possible for a person to contact during the test. Provide means for use at the completionof any test to ground any parts which were at high voltage during the test or have the potential for acquiring an induced chargeduring the te
22、st or retaining a charge even after disconnection of the voltage source. Thoroughly instruct all operators as to thecorrect procedures for performing tests safely. When making high voltage tests, particularly in compressed gas or in oil, it ispossible for the energy released at breakdown to be suffi
23、cient to result in fire, explosion, or rupture of the test chamber. Designtest equipment, test chambers, and test specimens so as to minimize the possibility of such occurrences and to eliminate thepossibility of personal injury. If the potential for fire exists, have fire suppression equipment avai
24、lable. See 20.1, 27.1, 33.1, 42.1,48.1, 55.1, 65.1, 69.1, and 79.1.PHYSICAL TESTS OF INSULATIONS AND JACKETS5. Scope5.1 Physical tests include determination of the following properties of insulations and jackets:5.1.1 Thickness,5.1.2 Tensile strength,5.1.3 Ultimate elongation,5.1.4 Accelerated aging
25、,5.1.5 Effects of oil immersion,5.1.6 Accelerated water absorption,5.1.7 Flame test evaluation,5.1.8 Heat shock,5.1.9 Heat distortion, and5.1.10 Cold bend.6. Significance and Use6.1 Physical tests, properly interpreted, provide information with regard to the physical properties of the insulation or
26、jacket.The physical test values give an approximation of how the insulation will physically perform in its service life. Physical testsprovide useful data for research and development, engineering design, quality control, and acceptance or rejection underspecifications.3 Available from Standardizati
27、on Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.4 Available from The Insulated Cable Engineers Association, Inc. (ICEA), P.O. Box 1568, Carrollton, GA 30112, http:/.D2633 1227. Sampling7.1 Number of SamplesUnless otherwise required by the detail
28、ed product specification, sample the wire and cable to do thephysical tests other than the tests for insulation and jacket thickness, as follows:7.1.1 For sizes of less than 250 kcmil (127 mm2)Select one sample for each quantity ordered between 2000 ft (600 m) and50 000 ft (15 200 m) of wire or cabl
29、e. Select one additional sample for each additional 50 000 ft thereafter. Do not select a samplefrom lots of less than 2000 ft.7.1.2 For sizes of 250 kcmil (127 mm2) and overSelect one sample for each quantity ordered between 1000 ft (300 m) and25 000 ft (7600 m) of wire or cable. Select one additio
30、nal sample for each additional 25 000 ft thereafter. Do not select a samplefrom lots of less than 1000 ft.7.2 Size of SamplesChoose samples at least 6 ft (2 m) in length when the wire size is less than 250 kcmil (127 mm2). Selecta sample at least 3 ft (1 m) in length when the wire size is 250 kcmil
31、or larger.8. Test Specimens8.1 Number of SpecimensFrom each of the samples selected in accordance with Section 7, prepare test specimens as follows:Test Number of Test SpecimensFor determination of original tensile strengthand ultimate elongation3For aging test 3For oil immersion 3When only one or t
32、wo samples are selected, test all three specimens of each sample, and report the average result of each.Otherwise, test one specimen of each three and hold the other two specimens in reserve.8.2 Size of SpecimensWhen testing wire smaller than 6 AWG (13.3 mm2) which has an insulation thickness less t
33、han 0.095in. (2.41 mm), test the entire specimen cut from the section of the insulation. When testing wire of 6 AWG and larger, or wiresmaller than 6 AWG having an insulation thickness greater than 0.095 in., cut specimens approximately square in section, with across section not greater than 0.025 i
34、n.2 (1.6 mm2) from the insulation. If necessary, use a segmented or sector-shaped specimen.Make the test specimens approximately 6 in. (150 mm) long. Take the jacket compound test specimens from the complete wireassembly. Cut the specimens parallel to the axis of the wire. Cut a test specimen (eithe
35、r a segment or sector) with a suitable sharpinstrument. Alternatively, use a die to prepare a shaped specimen with a cross-sectional area not greater than 0.025 in.2.8.3 Preparation of SpecimensPrepare specimens having smooth uncut surfaces. Remove irregularities and corrugations bybuffing, planing,
36、 or skiving so that the test specimen is smooth and uniform in thickness. Remove reinforcing cords or wirescarefully. Do not heat, immerse in water, or subject specimens to any mechanical or chemical treatment not specifically prescribedin these test methods. Additional treatments must be agreed upo
37、n by the producer and the purchaser.8.4 Insulation removal is often facilitated by stretching the conductor to the breaking point in a tensile-strength machine, or bycutting the insulation through to the conductor, longitudinally, and carefully removing it.9. Measurement of Thickness of Specimens9.1
38、 Make thickness measurements of the insulation with any type of micrometer reading to 0.001 in. (0.025 mm) and suitablefor measurements of this characteristic. See Test Methods D374 for appropriate measuring devices. Apparatus A is preferred,Apparatus C and Apparatus D are acceptable, but Apparatus
39、B is not recommended. The average thickness of the insulation iscalculated as one half the difference between the mean of the maximum and minimum diameters over the insulation at one pointand the average diameter of the conductor measured at the same point. The minimum thickness of the insulation is
40、 calculated asthe difference between a measurement made over the conductor plus the thinnest insulation wall, and the diameter of the conductor.(Make the first measurement after slicing off the thicker side of the insulation.) When the wire or cable has a jacket, remove thejacket and determine its m
41、inimum and maximum thickness by micrometer measurement. Take the average of these determinationsas the average thickness of the jacket.9.2 If the procedures given in 9.1 cannot be followed conveniently, use of an optical micrometer is permitted.9.3 Number of Thickness Measurements When the lot of wi
42、re to be inspected consists of two or fewer coils or reels, makeat least one determination of the thickness on each coil or reel. When the lot is greater than two coils or reels and fewer than 20coils or reels, make at least one determination of the thickness on each of two coils or reels selected a
43、t random. For lots greaterthan 20 coils or reels, randomly select a minimum of 10 % of the coils or reels. Make at least one determination of thickness oneach coil or reel selected.10. Physical Test Procedures10.1 Determine the physical properties in accordance with Test Method D638, except as speci
44、fied in 10.2, 10.3, and 10.4.10.2 Test the specimens at a temperature of 68 to 82 F (20 to 28 C).D2633 12310.3 Mark specimens for all physical tests with gauge marks 1 in. (25 mm) apart. Place a specimen in the jaws of the testingmachine. The maximum distance between the jaws is 2 in. (50 mm).10.4 T
45、est insulation or jacketing at a jaw separation speed as specified in Specification D1248 or other applicable productspecification.11. Calculation of Area of Specimens11.1 Calculate the area of a test specimen as follows:11.1.1 When the total cross-section of the insulation is used, calculate the ar
46、ea as the difference between the area of the circlewhose diameter is the average outside diameter of the insulation and the area of the conductor. Calculate the area of a strandedconductor from its maximum diameter.11.1.2 Where the specimen is a slice cut from the insulation by a knife held tangent
47、to the wire, and the resulting cross-sectionof that slice is not a segment of a circle, calculate the area from a direct measurement of the volume or from the specific gravityand the weight of a known length of the specimen having a uniform cross-section.11.1.3 When a portion of a sector of a circle
48、 is taken from a large conductor, calculate the area as the thickness times the width.(This applies either to a die cut specimen or one from which all corrugations have been removed.)11.1.4 Determine the dimensions of specimens to be aged before the aging cycle is begun.12. Aging Test12.1 Age specim
49、ens in accordance with Test Method D573, except as specified in 12.2, 12.3, and 12.4.12.2 Use an oven that meets the requirements given in Specification D5423 for Type II ovens.12.3 The product specification defines the test period and temperature of heat aging.12.4 Test the tensile strength and ultimate elongation of the specimens between 16 and 96 h after completion of heat aging. Usethe procedure described in Section 11. Perform physical tests on both aged and unaged specimens at the same time.13. Oil Immersion Test13.1 Oil Immersion Test for
