NEMA EW 1:1988 (R2004)

NEMA EW 1:1988 (R2004) Electric Arc Welding Power Sources Describes performance characteristics, ratings, and test procedures for a.c. and d.c. arc welding apparatus and associate equipment as well as recommended installation and test procedures for high fre

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Table of Contents

FOREWORD
PURPOSE
SCOPE
Section1REFERENCEDSTANDARDS
ReferencedStandards
Definitions
Section2GENERAL
SuitabilityofOperation
ArcWeldingPowerSourcewithIntegralWireFeedUnit
ServiceConditions
UsualServiceConditions
UnusualServiceConditions
InstallationandOperation
Section3CONSTRUCTIONREQUIREMENTS-MECHANICAL
CONSIDERATIONS
FrameandEnclosure
EnclosureConstruction
OpeningsinEnclosures
CorrosionProtection
ServiceLineHoses
WaterCooling
Brushes
JerkandDropTests
StackingofArcWeldingPowerSources
Section4CONSTRUCTIONREQUIREMENTS-ELECTRICAL
CONSIDERATIONS
PowerSupplyConnection-General
PowerSupplybyFlexibleCord
PowerSupplybyPermanentWiringSystem
Grounding
CorrosionProtection
OutputProvisions
InternalWiringRequirements
Spacings
ClassificationofInsulationSystems
RequirementsforSpecificComponents
OutputRegulatingTaps
AuxiliaryPowerSupply
ShortCircuitofWeldingCircuit
Section5RATINGSANDPERFORMANCE
InputRatingsofArcWeldingPowerSourcesOperating
FromElectricalPowerSupplies
PowerFactorCorrection
OpenCircuitVoltage
OutputRatingsofConstantCurrentNEMAClassIArc
WeldingPowerSources
OutputRatingsofConstantCurrentNEMAClassIIArc
WeldingPowerSources
OutputRatingsofConstantCurrentNEMAClassIIIArc
WeldingPowerSources
OutputRatingsofConstantVoltageNEMAClassIArc
WeldingPowerSources
NoLoadOperation
TemperatureRise
NameplateMarking
Section6TEMPERATURETESTS
TestingProceduresforArcWeldingPowerSources
ThermometerMethodofTemperatureDetermination
ResistanceMethodofTemperatureDetermination
AppliedThermocoupleMethodofTemperatureDetermination
DeterminationofAmbientTemperature
CoolingAirTemperatureDuringTests
OmissionofTemperatureTestonDuplicateApparatus
CorrectionofTemperaturetoTimeofShutdown
StoppingGenerator-TypePowerSourcesforTemperature
Tests
Section7HIGH-POTENTIALTESTS
HighPotentialTests
TestVoltage
DurationofApplicationofTestVoltage
PointsofApplicationofTestVoltage
TemperatureatWhichHighPotentialTestsAretobeMade
HighPotentialTestProcedureforComponentsand
Accessories
ProductionLineHighPotentialTesting
Section8EFFICIENCYANDPOWERFACTOR
MethodofDeterminingEfficiencyandPowerFactor
Section9POWERSOURCESTOBEUSEDWITHGASTUNGSTEN
ARCWELDING(GTAW)
General
Definitions
VoltAmpereRelationshipforGTAW
CategoriesofGTAWPowerSources
NameplateMarking
Section10ARCWELDINGPOWERSOURCESWITHHIGHFREQUENCY
ARCSTARTINGAND/ORSTABILIZING
General
Definitions
HFClassification
RadioFrequencyRadiation
GeneralPrinciplesforInstallationofHighFrequency
StabilizedArcWeldingInstallations
CertificationsofHFSAWInstallations

Abstract

Describes performance characteristics, ratings, and test procedures for a.c. and d.c. arc welding apparatus and associate equipment as well as recommended installation and test procedures for high frequency stabilized arc welding machines.

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