Designation:B258−14StandardSpecificationforStandardNominalDiametersandCross-SectionalAreasofAWGSizesofSolidRoundWiresUsedasElectricalConductors1ThisstandardisissuedunderthefixeddesignationB258;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationprescribesstandardnominaldiam-etersandcross-sectionalareasofAmericanWireGage(AWG)sizesofsolidroundwires,usedaselectricalconductors,andgivesequationsandrulesforthecalculationofstandardnominalmassandlengths,resistances,andbreakingstrengthsofsuchwires(ExplanatoryNote1).1.2Thevaluesstatedininch-poundorSIunitsaretoberegardedseparatelyasstandard.Eachsystemshallbeusedindependentlyoftheother.Combiningvaluesofthetwosystemsmayresultinnonconformancewiththespecification.ForconductorsizesdesignatedbyAWGorkcmilsizes,therequirementsinSIunitshavebeennumericallyconvertedfromthecorrespondingvaluesstatedorderived,ininch-poundunits.ForconductorsizesdesignatedbySIunitsonly,therequire-mentsarestatedorderivedinSIunits.1.2.1Fordensity,resistivityandtemperature,thevaluesstatedinSIunitsaretoberegardedasstandard.2.ReferencedDocuments2.1ASTMStandards:2A111SpecificationforZinc-Coated(Galvanized)“Iron”TelephoneandTelegraphLineWireA326SpecificationforZinc-Coated(Galvanized)HighTen-sileSteelTelephoneandTelegraphLineWire(Withdrawn1990)3B1SpecificationforHard-DrawnCopperWireB2SpecificationforMedium-Hard-DrawnCopperWireB3SpecificationforSoftorAnnealedCopperWireB9SpecificationforBronzeTrolleyWireB33SpecificationforTin-CoatedSoftorAnnealedCopperWireforElectricalPurposesB47SpecificationforCopperTrolleyWireB105SpecificationforHard-DrawnCopperAlloyWiresforElectricConductorsB189SpecificationforLead-CoatedandLead-Alloy-CoatedSoftCopperWireforElectricalPurposesB19...
