ASTM_D_1523_-_00.pdf

Designation:D 1523 00An American National StandardStandard Specification forSynthetic Rubber Insulation for Wire and Cable,90COperation1This standard is issued under the fixed designation D 1523;the number immediately following the designation indicates the 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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers a crosslinked insulating com-pound for electrical wires and cables.The rubber polymer isprimarily composed of synthetic rubber.1.2 This type of insulation is suitable for continuous opera-tion at conductor temperatures not exceeding 90C in drylocations,and operating voltages not exceeding 2000 V.Thisinsulation may have low-temperature limitations.Consult themanufacturer for specific recommendations for installation.1.3 In many instances the insulation cannot be tested unlessit has been formed around a conductor.Therefore,tests aredone on insulated wire in this standard solely to determine therelevant property of the insulation and not to test the conductoror completed cable.1.4 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 Documents2.1 ASTM Standards:D 470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and Cable2D 1711 Terminology Relating to Electrical Insulation23.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification referto Terminology D 1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging(act of),nexposure of materials to air at121C for 168 h or heat and pressure at 127C for 42 h.4.Physical Properties4.1 Table 1 lists the unaged and aged physical propertyrequirements.4.2 Thickness of Insulation Table number 1A of TestMethods D 470 lists the minimum average thickness for theinsulation.The required minimum thickness is 90%of thatgiven in Table number 1A of Test Methods D 470.5.Electrical Requirements5.1 Order of TestingPerform the ac voltage,insulationresistance,and dc voltage tests in that order when any of thesetests are required.The sequence for 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 withstandvoltage given in Table number 1A of Test Methods D 470under the columns labeled“Other Than Ozone-Resisting Insu-lations.”5.3 Insulation Resistance:5.3.1 The insulated conductor shall have an insulationresistance value of at least that corresponding to a constant of4000 at 60F(15.6C).5.3.2 If the temperature at the time measurement was madediffers from 60F(15.6C)correct the insulation resistance to60F.Table number 2 of Test Methods D 470 contains thecorrection factors.Each insulation manufacturer can furnishthe 1F coefficient for the insulation material by using theprocedure given in Test Methods D 470.Multiply the measuredvalue by the correction factor to obtain the insulation resistancevalue corrected to 60F.5.3.3 Where a nonconducting separator is applied betweenthe conductor and insulation,or where an insulated conductor1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.18 on Solid Insulations,Non-Metallic Shieldings,and Cover-ings for Electrical and Telecommunications Wires and Cables.Current edition approved Sept.10,2000.Published November 2000.Originallypublished as D 152358 T.Last previous edition D 152395.2Annual Book of ASTM Standards,Vol 10.01.TABLE 1 Physical Properties for Synthetic Rubber Insulation,90C OperationAUnaged Requirements:Tensile strength,min,psi(MPa)700(4.8)Elongation at rupture,min,%300Set in 2-in.(or 50-mm)gage length,max,%25Aged Requirements:After Air Pressure Heat Test at 1276 1C for 42 h:Tensile strength and elongation,min,percentageof unaged value50After Air Oven Test at 121 6 1C for 168 h:Tensile strength and elongation,min,percentageof unaged value50AThe values specified are applicable to insulation having a nominal wallthickness of 0.030 in.(0.76 mm)or greater.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.is covered with a nonmetallic jacket so that the insulationresistance can be measured only on the completed assembly,the required insulation resistance shall be at least 60%of thatrequired for the primary insulation based on the thickness ofthat insulation.5.4 DC Voltage TestUnless otherwise specified,omit thistest if the ac test described in 5.2 has been performed.Aftercompletion of the insulation resistance test,test each insulatedconductor for 5 min at the dc test voltage given in Tablenumber 1B of Test Methods D 470 under the columns labeled“Oth