ANSI NEMA WC 74 ICEA S-93-639-2012

ApprovedasanAmericanNationalStandardANSIApprovalDate:December18,2012InsulatedCableEngineersAssociation,Inc.PublicationNo.ICEAS93639NEMAStandardsPublicationNo.WC742012546kVShieldedPowerCableforUseintheTransmissionandDistributionofElectricEnergyPreparedandSponsoredby:InsulatedCableEngineersAssociation,Inc.P.O.Box1568Carrollton,Georgia30112www.icea.netPublishedby:NationalElectricalManufacturersAssociation1300North17thStreetRosslyn,Virginia22209www.nema.org©Copyright2012bytheNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociation,Incorporated.Allrightsincludingtranslationintootherlanguages,reservedundertheUniversalCopyrightConvention,theBerneConventionfortheProtectionofLiteraryandArtisticWorks,andtheInternationalandPanAmericanCopyrightConventions.ANSINEMAWC74ICEAS936392012Pageii©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociationNOTICEANDDISCLAIMERTheinformationinthispublicationwasconsideredtechnicallysoundbytheconsensusofpersonsengagedinthedevelopmentandapprovalofthedocumentatthetimeitwasdeveloped.Consensusdoesnotnecessarilymeanthatthereisunanimousagreementamongeverypersonparticipatinginthedevelopmentofthisdocument.TheNationalElectricalManufacturersAssociation(NEMA)andtheInsulatedCableEngineersAssociation(ICEA)standardsandguidelinepublications,ofwhichthedocumentcontainedhereinisone,aredevelopedthroughavoluntaryconsensusstandardsdevelopmentprocess.Thisprocessbringstogetherpersonswhohaveaninterestinthetopiccoveredbythispublication.WhileNEMAandICEAadministerstheprocessandestablishesrulestopromotefairnessinthedevelopmentofconsensus,theydonotindependentlytest,evaluate,orverifytheaccuracyorcompletenessofanyinformationorthesoundnessofanyjudgmentscontainedinitsstandardsandguidelinepublications.NEMAandICEAdisclaimsliabilityforpersonalinjury,property,orotherdamagesofanynaturewhatsoever,whetherspecial,indirect,consequential,orcompensatory,directlyorindirectlyresultingfromthepublication,useof,application,orrelianceonthisdocument.NEMAandICEAdisclaimsandmakesnoguarantyorwarranty,expressedorimplied,astotheaccuracyorcompletenessofanyinformationpublishedherein,anddisclaimsandmakesnowarrantythattheinformationinthisdocumentwillfulfillanyofyourparticularpurposesorneeds.NEMAandICEAdonotundertaketoguaranteetheperformanceofanyindividualmanufacturerorseller’sproductsorservicesbyvirtueofthisstandardorguide.Inpublishingandmakingthisdocumentavailable,NEMAandICEAarenotundertakingtorenderprofessionalorotherservicesfororonbehalfofanypersonorentity,norareNEMAandICEAundertakingtoperformanydutyowedbyanypersonorentitytosomeoneelse.Anyoneusingthisdocumentshouldrelyonhisorherownindependentjudgmentor,asappropriate,seektheadviceofacompetentprofessionalindeterminingtheexerciseofreasonablecareinanygivencircumstances.Informationandotherstandardsonthetopiccoveredbythispublicationmaybeavailablefromothersources,whichtheusermaywishtoconsultforadditionalviewsorinformationnotcoveredbythispublication.NEMAandICEAhavenopower,nordotheyundertaketopoliceorenforcecompliancewiththecontentsofthisdocument.NEMAandICEAdonotcertify,test,orinspectproducts,designs,orinstallationsforsafetyorhealthpurposes.AnycertificationorotherstatementofcompliancewithanyhealthorsafetyrelatedinformationinthisdocumentshallnotbeattributabletoNEMAandICEAandissolelytheresponsibilityofthecertifierormakerofthestatement.ANSINEMAWC74ICEAS936392012Pageiii©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociationCONTENTSPageSECTION1GENERAL11.1SCOPE..11.2GENERALINFORMATION..11.3INFORMATIONTOBESUPPLIEDBYPURCHASER11.3.1CharacteristicsofSystemonWhichCableistobeUsed..11.3.2QuantitiesandDescriptionofCable21.4DEFINITIONSANDSYMBOLS2SECTION2CONDUCTOR.52.1PHYSICALANDELECTRICALPROPERTIES52.1.1CopperConductors..52.1.2AluminumConductors.52.2OPTIONALWATERBLOCKINGCOMPONENTSFORSTRANDEDCONDUCTORS..62.3CONDUCTORSIZEUNITS..62.4CONDUCTORDCRESISTANCEPERUNITLENGTH.62.4.1DirectMeasurementofdcResistance.62.4.2CalculationofdcResistancePerUnitLength62.5CONDUCTORDIAMETER..7SECTION3CONDUCTORSHIELD(STRESSCONTROLLAYER).133.1MATERIAL..133.2PHYSICALREQUIREMENTS133.3ELECTRICALREQUIREMENTS..133.3.1ExtrudedSemiconductingMaterial133.3.2ExtrudedNonconductingMaterial(ForEPRInsulationOnly).133.3.2.1WithstandTest..133.3.3SemiconductingTape..143.4CROSSLINKED(THERMOSET)REQUIREMENTS.14SECTION4INSULATION.154.1MATERIAL..154.2INSULATIONTHICKNESS.164.2.1SelectionofProperThickness164.3INSULATIONREQUIREMENTS16SECTION5INSULATIONSHIELDING.225.1SHIELDINGOFINSULATEDCABLE225.1.1InsulationShield.225.2REMOVABILITYOFINSULATIONSHIELD235.2.1DischargeFreeCableDesignsWithExtrudedInsulationShields.235.2.2DischargeResistantCableDesignsWithExtrudedInsulationShields23SECTION6METALLICSHIELDING(SEEAPPENDIXG)..266.1GENERAL266.2METALTAPES..266.2.1HelicallyAppliedTape(s).266.2.2LongitudinallyAppliedCorrugatedTape..266.3COPPERWIRES,STRAPS,SHEATHORARMOR.266.4MULTIPLECONDUCTORCABLES.27SECTION7COVERINGS.287.1JACKETS.28ANSINEMAWC74ICEAS936392012Pageiv©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociation7.1.1CrosslinkedandThermoplasticJacketsGeneral287.1.2Neoprene,HeavyDutyBlack(CRHD)287.1.3Neoprene,GeneralPurpose(CRGP).287.1.4PolyvinylChloride..287.1.5LowandLinearLowDensityPolyethylene(LDPELLDPE).287.1.6MediumDensityPolyethylene,Black(MDPE)287.1.7HighDensityPolyethylene(HDPE)287.1.8NitrilebutadienePolyvinylchloride,HeavyDuty(NBRPVCHD).297.1.9NitrilebutadienePolyvinylchloride,General–PurposeDuty(NBRPVCGP)..297.1.10ChlorosulfonatedPolyethylene,HeavyDuty(CSPEHD)297.1.11ChlorinatedPolyethylene,Thermoplastic(CPETP).297.1.12ChlorinatedPolyethylene,Crosslinked,HeavyDuty(CPEXLHD)..297.1.13Polypropylene(PP)..297.1.14ThermoplasticElastomer(TPE)297.1.15LowSmokeHalogenFreeJackets(LSHF).297.1.16Repairs.307.1.17TestforSuitabilityforExposuretoSunlight.307.1.18OptionalTrayCableFlameTestRequirement307.1.19SeparatorUnderJacket307.1.20JacketThickness337.1.21JacketIrregularityInspection..337.2METALLICANDASSOCIATEDCOVERINGS347.2.1General.347.3DIVISIONI..357.3.1MetallicSheaths.357.3.2FlatSteelTapeArmor..377.3.3InterlockedMetalTapeArmor397.3.4ContinuouslyCorrugatedMetalArmor.407.3.5GalvanizedSteelWireArmorForSubmarineCables..417.3.6BeddingOverCableCoresToBeMetallicArmored.447.3.7OuterServings457.3.8CrosslinkedJacketsOverMetallicSheathsandArmors.457.3.9ThermoplasticJacketsOverMetallicSheathsorArmors.467.4DIVISIONII.477.4.1BoreholeCable(SuspendedatOneEndOnly).477.4.2DredgeCable.487.4.3ShaftCable.497.4.4VerticalRiserCable..497.5DIVISIONIII.507.5.1BuriedLandCables..50SECTION8ASSEMBLY,FILLERS,ANDCABLEIDENTIFICATION..518.1ASSEMBLYOFMULTIPLECONDUCTORCABLES..518.2FILLERS..528.3CONDUCTORIDENTIFICATION..528.4CABLEIDENTIFICATION52SECTION9PRODUCTIONTESTSANDTESTMETHODS549.1GENERAL549.1.1TestingandTestFrequency549.1.2TestMethods..549.1.3NumberofTestSpecimensfromSamples..569.2THICKNESSMEASUREMENTS569.2.1BeddingsandServings569.2.2OtherComponents569.3SAMPLESANDSPECIMENSFORPHYSICALANDAGINGTESTS..56ANSINEMAWC74ICEAS936392012Pagev©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociation9.3.1General.569.3.2Sampling..569.3.3SizeofTestSpecimens579.3.4SpecimenswithBondedLayers.579.3.5SpecimenSurfaceIrregularities.579.3.6SpecimensfortheAgingTests..589.3.7CalculationofAreaofTestSpecimens589.4AGINGTESTS599.4.1AirOvenAgingTest..599.4.2OilImmersionTest599.5HEATSHOCKTEST.599.6COLDBENDTEST609.7TIGHTNESSOFPOLYETHYLENEJACKETTOSHEATHTEST.609.8ELECTRICALTESTSONCOMPLETEDCABLES609.8.1VoltageTests..609.8.2PartialDischargeTestProcedure.619.9ADHESION(INSULATIONSHIELDREMOVABILITYTEST).619.10HOTCREEPTEST619.11SOLVENTEXTRACTION619.12WAFERBOILTESTFOREXTRUDEDTHERMOSETSHIELDS..619.12.1InsulationShieldHotCreepProperties619.13WATERCONTENT619.13.1WaterUndertheJacket629.13.2WaterintheConductor629.13.3WaterExpulsionProcedure.629.13.4PresenceofWaterTest629.14VOLUMERESISTIVITY629.15RETESTS629.15.1PhysicalandAgingPropertiesandThickness629.15.2OtherTests.63SECTION10QUALIFICATIONTESTS6410.1ACCELERATEDWATERABSORPTIONTEST,ELECTRICALMETHODAT60HZ.6410.2INSULATIONRESISTANCETEST..6410.3DRYELECTRICALTESTFORCLASSIIIINSULATIONSONLY..6510.3.1TestSamples..6510.3.2TestProcedure..6510.3.3ElectricalMeasurements.6510.4TESTFORDISCHARGERESISTANTINSULATION(EPRCLASSIVINSULATIONONLY)..6510.5BRITTLENESSTESTFORSEMICONDUCTINGSHIELDS..6610.6TRAYCABLEFLAMETEST6610.7SUNLIGHTRESISTANCETEST..6610.8DIELECTRICCONSTANTANDDISSIPATIONFACTOR.6610.9HALOGENCONTENTOFNONMETALLICELEMENTS6710.10SMOKEGENERATIONTEST6710.11ACIDGASEQUIVALENTTEST.6710.12ENVIRONMENTALSTRESSCRACKINGTEST6710.13ABSORPTIONCOEFFICIENT6710.14DIELECTRICCONSTANTANDVOLTAGEWITHSTANDFORNONCONDUCTINGSTRESSCONTROLLAYERS67SECTION11CONSTRUCTIONSOFSPECIFICTYPES.6811.1PREASSEMBLEDAERIALCABLE..6811.1.1Scope6811.1.2Conductors..6811.1.3Insulation.6811.1.4CableTypes68ANSINEMAWC74ICEAS936392012Pagevi©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociation11.1.5Jacket6911.1.6Identification6911.1.7Assembly.6911.1.8Messenger..6911.1.9DesignCriteria6911.1.10Tests..70APPENDIXAINDUSTRYSTANDARDREFERENCES(NORMATIVE)72APPENDIXBEMERGENCYOVERLOADS(NORMATIVE).75APPENDIXCPROCEDUREFORDETERMININGDIMENSIONALREQUIREMENTSOFJACKETSANDASSOCIATEDCOVERINGS(NORMATIVE)..76APPENDIXDOPTIONALFACTORYDCTEST(INFORMATIVE)79APPENDIXEREPRESENTATIVETENSILESTRENGTHANDELONGATIONOFNONMAGNETICMETALS(INFORMATIVE).80APPENDIXFVOLTAGETESTSAFTERINSTALLATION(INFORMATIVE).81APPENDIXGSHIELDING(INFORMATIVE)..82APPENDIXHADDITIONALCONDUCTORINFORMATION(INFORMATIVE).84APPENDIXIRECOMMENDEDBENDINGRADIIFORCABLES(INFORMATIVE)87APPENDIXJETHYLENEALKENECOPOLYMER(EAM)(INFORMATIVE)90ANSINEMAWC74ICEAS936392012Pagevii©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociationForewordThisStandardsPublicationfor546kVShieldedPowerCableforUseintheTransmissionandDistributionofElectricEnergywasdevelopedbytheInsulatedCableEngineersAssociation(ICEA)andapprovedbytheNationalElectricalManufacturersAssociation(NEMA).ICEANEMAStandardsareadoptedinthepublicinterestandaredesignedtoeliminatemisunderstandingbetweenthemanufacturerandtheuserandtoassisttheuserinselectingandobtainingtheproperproductforhisparticularneed.ExistenceofanICEANEMAStandarddoesnotinanyrespectprecludethemanufactureoruseofproductsnotconformingtothestandard.TheuserofthisStandardiscautionedtoobserveanyhealthorsafetyregulationsandrulesrelativetothemanufactureanduseofcablemadeinconformitywiththisStandard.RequestsforinterpretationofthisStandardmustbesubmittedinwritingto:InsulatedCableEngineersAssociationP.O.Box1568Carrollton,GA30112,USAAnofficialwritteninterpretationwillbeprovidedonceapprovedbyICEAandNEMA.SuggestionsforimprovementsgainedintheuseofthisStandardwillbewelcomedbytheAssociation.ANSINEMAWC74ICEAS936392012Pageviii©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociation<Thispageisintentionallyleftblank.>ANSINEMAWC74ICEAS936392012Page1©Copyright2012byNationalElectricalManufacturersAssociationandtheInsulatedCableEngineersAssociationSection1GENERAL1.1SCOPEThisstandardappliestomaterials,constructions,andtestingof5000voltto46,000voltshieldedcrosslinkedpolyethylene,andethylenepropylenerubberinsulatedwiresandcableswhichareusedforthetransmissionanddistributionofelectricalenergyfornormalconditionsofinstallationandservice,eitherindoors,outdoors,aerial,underground,orsubmarine.1.2GENERALINFORMATIONThisstandardcoverstherequirementsforconductors,theinsulationsandprotectivecoveringsandgeneralconstructionalanddimensionaldetailscommontomoststandardshieldedtypesofwiresandcables.ConstructionsofspecifictypesarecoveredinSection11orinotherICEAdocuments.WhereaconflictexistsbetweentherequirementsofSection11,orotherICEAdocuments,andthoseofSections1to9inclusive,therequirementsofspecifictypesshallapply.SeeAppendixAforcompletetitlesanddatesofICEApublicationsandASTMStandardstowhichreferenceismadeinthispublication.SeeSection9fortestproceduresnotelsewherereferenced.RecommendedminimumbendingradiiaregiveninAppendixI.Inclassifyingcrosslinkedinsulationsandjacketsinthisstandard,thetermrubberwhenusedalonewithoutfurtherdescriptionshallmeansyntheticrubber.Insulationthicknessesaredesignatedintermsofcableinsulationlevels(see4.2).Inclassifyingjacketsandsheathsinthisstandard,thetermjacketreferstoacontinuousnonmetalliccoveringandsheathtoacontinuousmetalliccovering.U.S.customaryunits,exceptfortemperature,arespecifiedthroughoutthisstandard.ApproximateInternationalSystemofUnits(SI)equivalentsareincludedforinformationonly.RequirementsofareferencedASTMstandardshallbedeterminedinaccordancewiththeprocedureormethoddesignatedinthereferencedASTMstandardunlessotherwisespecifiedinthisstandard.1.3INFORMATIONTOBESUPPLIEDBYPURCHASERWhenrequestingdesignproposalsfromcablemanufacturers,theprospectivepurchasershouldfurnishthefollowinginformation:1.3.1CharacteristicsofSystemonWhichCableistobeUsed1.Currentalternatingordirect.2.Frequencyhertz.3.Normaloperatingvoltagebetweenphasesor,indirectcurrent,betweenconductors.4.Numberofphasesandconductors.5.Cableinsulationlevel(see4.2).6.Minimumtemperatureatwhichcablewillbeinstalled.7.Descriptionofinstallation.a.Inbuildings.b.Inundergroundducts. ANSINEMAWC74ICEAS936392012FinalANSITECH.pdf ANSINEMAWC74ICEAS936392012Final.pdf