NEMA WC 71:1999

NEMA WC 71:1999 Standard For Non-shielded Cables Rated 2001-5000 Volts For Use In The Distribution Of Electrical Energy Describes the requirements for conductors, insulation and protective coverings and the general constructional and dimensional details being used to manufacture wires and cables used for the transmissi

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Table of Contents

PART1-GENERAL
1.1SCOPE
1.2INFORMATIONTOBESUPPLIEDBYPURCHASER
1.2.1CharacteristicsofSystemonWhich
Cableistobeused
1.2.2QuantitiesandDescriptionofCable
PART2-CONDUCTORS
2.0GENERAL
2.1PHYSICALANDELECTRICALPROPERTIES
2.1.1CopperConductors
2.1.2AluminumConductors
2.2OPTIONALSEALANTFORSTRANDEDCONDUCTORS
2.3CONDUCTORSIZEUNITS
2.4CONDUCTORDCRESISTANCE
2.4.1DirectMeasurementofdcResistance
2.4.2CalculationofdcResistance
2.5CONDUCTORDIAMETER
PART3-STRESSCONTROLLAYER(CONDUCTORSHIELD)
3.0GENERAL
3.1MATERIALANDTHICKNESS
3.2PHYSICALREQUIREMENTS
3.3ELECTRICALREQUIREMENTS
PART4-INSULATION
4.1INSULATIONMATERIALS
4.2INSULATIONLEVELS
4.3INSULATIONANDJACKETTHICKNESS
4.4INSULATIONREQUIREMENTS
4.4.1VoltageTests
4.4.2InsulationResistance
4.4.4OtherRequirements
PART5-COVERINGS
5.1JACKETS
5.1.1Cross-linkedandThermoplasticjackets
5.1.2Repairs
5.1.3Neoprene,Heavy-dutyBlack(CR_HD)
5.1.4Neoprene,GeneralPurpose(CR-GP)
5.1.5PolyvinylChloride(PVC)
5.1.6LowandLinearLowDensityPolyethylene
(LDPELLDPE)
5.1.7MediumDensityPolyethylene,Black(MDPE)
5.1.8HighDensityPolyethylene(HDPE)
5.1.9Nitrile-butadiene/Polyvinyl-chloride,
HeavyDuty(NB/PVC-GP)
5.1.10Nitrile-butadiene/Polyvinyl-chloride,
GeneralPurpose(NB/PVC-GP)
5.1.11ChlorosulfonatedPolyethylene,HeavyDuty
(CSPE-HD)
5.1.12ChlorinatedPolyethylene,Thermoplastic
(CPE-TP)
5.1.13ChlorinatedPolyethlene,Cross-Linked,
HeavyDuty(CPE-XL-HD)
5.1.14OptionalRequirements
5.1.15SeparatorUnderJacket
5.1.16JacketThickness
5.2METALLICANDASSOCIATEDCOVERINGS
5.2.1General
5.2.2Divisions
5.3DIVISIONI
5.3.1MetallicSheaths
5.3.2FlatSteelTapeArmor
5.3.3InterlockedMetalTapeArmor
5.3.4ContinuouslyCorrugatedMetalArmor
5.3.5GalvanizedSteelWireArmorForSubmarine
Cables
5.3.6BeddingOverCableCoresToBeMetallic
Armored
5.3.7OuterServings
5.3.8Cross-linkedJacketsOverMetallicSheaths
andArmors
5.3.9ThermoplasticJacketsOverMetallicSheaths
andArmors
5.4DIVISIONII
5.4.1BoreholeCable(SuspendedatOneEndOnly)
5.4.2DredgeCable
5.4.3ShaftCable
5.4.4VerticalRiserCable
5.5DIVISIONIII
5.5.1BuriedLandCables
PART6-ASSEMBLY,FILLERS,GROUNDINGCONDUCTORS,AND
IDENTIFICATION
6.1ASSEMBLYOFMULTIPLE-CONDUCTORCABLES
6.1.1MultipleConductorRoundCablesWithAn
OverallCovering
6.1.2FlatTwinCablesWithOverallCovering
6.1.3MultipleConductorCablesWithoutAn
OverallCovering
6.2FILLERS
6.3GROUNDINGCONDUCTORS
6.4CONDUCTORIDENTIFICATION
PART7-TESTINGANDTESTMETHODS
7.1GENERAL
7.1.1TestingandSamplingFrequency
7.1.2TestMethods
7.1.3NumberofTestSpecimensFromSamples
7.2THICKNESSMEASUREMENTS
7.2.1BeddingsandServings
7.2.2OtherComponents
7.3SAMPLESANDSPECIMENSFORPHYSICALANDAGINGTESTS
7.3.1General
7.3.2Sampling
7.3.3SizeofTestSpecimens
7.3.4SpecimensWithRemovableJackets
7.3.5SpecimensWithNon-RemovableJackets
7.3.6SpecimenSurfaceIrregularities
7.3.7SpecimensforTheAgingTests
7.3.8CalculationofAreaofTestSpecimens
7.4TENSILE,ELONGATIONANDSETTESTPROCEDURES
7.4.1TestSpecimens,Machine,andTemperature
7.4.2TensileStrengthTest
7.4.3ElongationTest
7.4.4TensileStressTest
7.4.5SetTest
7.5AGINGTESTS
7.5.1AirOvenAgingTest
7.5.2OilImmersionTest
7.5.3HotCreepTest
7.6HEATSHOCKANDENVIRONMENTALTESTS
7.6.1HeatShockTest
7.6.2EnvironmentalStressCrackingTest
7.6.3OzoneResistanceTest
7.6.4SunlightResistanceTest
7.7VOLUMERESISTIVITY,COLD-BEND,FLEXIBILITY,
ANDJACKETTIGHTNESSTESTS
7.7.1VolumeResistivityTest(ConductorShield)
7.7.2Cold-BendTest
7.7.3FlexibilityTestforContinuously
CorrugatedArmor
7.7.4TightnessofPolyethyleneJackettoSheath
Test
7.8TRAYCABLEFLAMETEST
7.9ELECTRICALACCELERATEDWATERABSORPTIONTEST(EM-60)
7.10U-BENDDISCHARGERESISTANCETESTS
7.10.1ConditioningofSamplesPriortoTesting
7.10.2BendingMandrelDiameters
7.10.3TestVoltageandTime
7.11ELECTRICALTESTSONCOMPLETEDCABLES
7.11.1VoltageTests
7.11.2InsulationResistanceTest
7.12RETESTS
7.12.1PhysicalandAgingPropertiesandThickness
7.12.2OtherTests
PART8-CONSTRUCTIONOFSPECIFICTYPES
8.1PREASSEMBLEDAERIALCABLES
8.1.1Scope
8.1.2Construction
PART9-APPENDICES
APPENDIXA-NEMA,ICEA,ANDASTMSTANDARDS
APPENDIXB-DEFINITIONSOFMAXIMUMTEMPERATURESOFINSULATED
CABLECONDUCTORS
APPENDIXC-EMERGENCYOVERLOADS
APPENDIXD-ABBREVIATIONSANDSYMBOLS
APPENDIXE-REPRESENTATIVETENSILESTRENGTHANDELONGATION
OFNONMAGNETICMETALS
APPENDIXF-RECOMMENDEDBENDINGRADIIANDINSTALLATION
TEMPERATURESFORCABLES
APPENDIXG-ADDITIONALCONDUCTORINFORMATION

Abstract

Describes the requirements for conductors, insulation and protective coverings and the general constructional and dimensional details being used to manufacture wires and cables used for the transmission and distribution of electrical energy for normal conditions of installation and service, either indoors, outdoors, aerial, underground or submarine.

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