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NEMA AB 4:2009

NEMA AB 4:2009 Guidelines For Inspection And Preventive Maintenance Of Molded Case Circuit Breakers Used In Commercial And Industrial Applications Details a number of basic procedures that may be used for the inspection and preventive maintenance of molded case circuit breakers used in industrial and commercial applications rated up to and inclu

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Table of Contents

1.GENERAL
1.1Scope
1.2ReferencedStandards
2.SAFETYPROCEDURES
2.1Warning
2.2SafetyProcedure
2.3ReinstallationSafetyProcedure
3.GUIDELINES
3.1TheNationalElectricalCode
3.2AMoldedCaseCircuitBreaker
3.3ToAvoidDamagedorOtherwiseInoperableCircuit
BreakersBeingInadvertentlyReturnedtoService
3.4GuidanceRegardingInspectionandPreventive
MaintenanceProcedures
3.5ForInformationRegardingMoldedCaseCircuit
BreakerPerformanceandApplication
3.6WaterDamagedMoldedCaseCircuitBreakers
4.INSPECTIONPROCEDURES
4.1General
4.2ExposedFaceTemperatureCheck
4.3InspectionofEnclosureInterior
5.PREVENTIVEMAINTENANCE
5.1General
5.2EnvironmentalEvaluation
5.3InterchangeableTripUnits
5.4WireConnectors
5.5ReinstallationProcedure
6.TESTPROCEDURES
6.1General
6.2MechanicalOperationTests
6.3InsulationResistanceTest
6.4IndividualPoleResistanceTest(MillivoltDrop)
6.5Inverse-TimeOvercurrentTripTest
6.6InstantaneousOvercurrentTripTest
6.7RatedHold-InTest
7.ACCESSORYDEVICETESTPROCEDURES
7.1General
7.2ShuntTripReleaseTests
7.3Under-VoltageTripReleaseTests
7.4ElectricalOperatorTests
7.5AuxiliarySwitchTests
7.6AlarmSwitchTests

Abstract

Details a number of basic procedures that may be used for the inspection and preventive maintenance of molded case circuit breakers used in industrial and commercial applications rated up to and including 1000 V 50/60 Hz AC or AC/DC.

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