Designation:D3638−21´1StandardTestMethodforComparativeTrackingIndexofElectricalInsulatingMaterials1ThisstandardisissuedunderthefixeddesignationD3638;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—Subsections7.1.1,7.1.2,and9.4werecorrectededitoriallyinJanuary2022.1.Scope*1.1Thistestmethodevaluatesinashortperiodoftimethelow-voltage(upto600V)trackresistanceorcomparativetrackingindex(CTI)ofmaterialsinthepresenceofaqueouscontaminants.1.2Thevaluesstatedinmetric(SI)unitsaretoberegardedasstandard.Theinch-poundequivalentsofthemetricunitsareapproximate.1.3ThistestmethodistechnicallyequivalenttotheversionofIECPublication112citedin2.2.However,the2007versionofIEC60112FourthEditionyieldsnumericalCTIvaluesthatareverylikelytodiffersignificantlyfromthistestmethod.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1711TerminologyRelatingtoElectricalInsulationD6054PracticeforConditioningElectricalInsulatingMate-rialsforTesting(Withdrawn2012)32.2IECPublications:4IEC112MethodforthedeterminationoftheproofandthecomparativetrackingindicesofsolidinsulatingmaterialsIEC60112MethodforthedeterminationoftheproofandthecomparativetrackingindicesofsolidinsulatingmaterialsIEC60664-1Insulationcoordinationforequipmentwithinlow-voltagesupplysystems–Part1:Princi...
