Designation:B784−01(Reapproved2017)´1StandardSpecificationforModifiedConcentric-Lay-StrandedCopperConductorsforUseinInsulatedElectricalCables1ThisstandardisissuedunderthefixeddesignationB784;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—TyposinSection1werecorrectededitoriallyinApril2017.1.Scope1.1Thisspecificationcoversbaremodifiedconcentric-lay-strandedconductorsmadefromroundcopperwires,eitheruncoatedorcoatedwithtin,lead,orleadalloyforgeneraluseininsulatedelectricalcables.Theseconductorsshallbecon-structedwithacentralcoreconsistingofnotmorethansevenwires,surroundedbyoneormorelayersofhelicallylaidwires.1.2Forthepurposesofthisspecification,conductorsareclassifiedasfollows(ExplanatoryNote1andNote2):1.2.1ClassBModified—Conductorstobeinsulatedwithvariousmaterialssuchasrubber,paper,andcrosslinkpolyeth-ylene.1.2.2ClassCModifiedandClassDModified—ConductorswheregreaterflexibilityisrequiredthanisprovidedbyClassBModifiedconductors.1.3Thevaluesstatedininch-poundorSIunitsaretoberegardedseparatelyasstandard.Eachsystemshallbeusedindependentlyoftheother.Combiningthevaluesfromthetwosystemsmayresultinnon-conformancewiththespecification.ForconductorsizesdesignatedbyAWGorkcmilsizes,therequirementsinSIunitsarenumericallyconvertedfromthecorrespondingrequirementsininch-poundunits.ForconductorsizesdesignatedbyAWGorkcmil,therequirementsinSIunitshavebeennumericallyconvertedfromcorrespondingvaluesstatedorderivedininch-poundunits.ForconductorsizesdesignatedbySIunitsonly,therequirementsarestatedorderivedinSIunits.1.3.1Fordensity,resistivityandtemperature,thevaluesstatedinSIunitsaretoberegardedasstandard.NOTE1—ThesignificantdifferencesinthisspecificationfromSpecifi-cationB8areasfollows:(1)Thecentralcoreispermittedtocontainuptosevenwiresdrawnintotheassemblywithaninfinitel...
