NEMA SG 4:2009 (R2013)

NEMA SG 4:2009 (R2013) Alternating Current High-voltage Circuit Breakers Comprehends: - All ratings for outdoor circuit breakers above 1000 volts for alternating-current service. Circuit breakers for service in metal-enclosed or metal-clad enclosures and automatic circuit

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Table of Contents

Foreword
Section1-GENERAL
1.1Scope
1.2References
1.3Definition
1.3.1ApplicableAmericanNationalStandards
Section2-RATINGSTANDARDS
2.1ApplicableAmericanNationalStandards
Section3-FUNCTIONALCOMPONENTSANDREQUIREMENTS
3.1ApplicableAmericanNationalStandards
3.2OperatingMechanismsForOutdoorCircuitBreakers
3.2.1AllOperatingMechanisms
3.2.2ForPneumaticMechanismsOnly
3.2.3ForSpringChargeMechanisms
3.2.4ForHydraulicMechanisms
3.3RequirementsforTerminalsandConnections
3.3.1ThreadedTerminals
3.3.2FlatTerminals
3.3.3GroundTerminals
3.4InstrumentCurrentTransformers
3.4.1Ratings
3.4.2Characteristics
3.4.3TestProcedures
3.5UndervoltageTripDevice
3.6SecondaryandControlWiring(SmallWiring)
Section4-TESTINGSTANDARDS
4.1ApplicableAmericanNationalStandards
4.2RadioInfluenceVoltageTestsasApplicable
(DesignTest)
4.3NoiseRequirements
4.3.1TerminologyandDefinitions
4.3.2NoiseExposureConditions
4.3.3NoiseLevel
4.3.4NoiseMeasurementEquipment
4.3.5DesignTests
Section5-SPECIALAPPLICATION
5.1RepetitiveDutyCircuitBreakersforArcFurnace
Switching
5.1.3OperatingConditions
5.1.4ConditionsoftheCircuitBreaker
5.1.5MinimumOperationsUnderFaultConditions
Section6-RECOMMENDEDINSTALLATION,OPERATION,AND
MAINTENANCEPROCEDURES
6.1General
Appendices
ABUSHINGPOTENTIALDEVICESFORTANK-TYPEOUTDOOROIL
CIRCUITBREAKERS
BTYPICALCONNECTIONFORSECONDARYBURDENS

Abstract

Comprehends: - All ratings for outdoor circuit breakers above 1000 volts for alternating-current service. Circuit breakers for service in metal-enclosed or metal-clad enclosures and automatic circuit reclosers are excluded. - Attachments for these circuit breakers, such as bushing current transformers, bushing potential devices, interlocks, undervoltage trip devices, shunt trips, overcurrent trips, and auxiliaries sold with the circuit breakers such as closing relays and structural steel supports. - Renewal, modernizing, and spare parts for these circuit breakers and attachments. - Recommended installation, operation, and maintenance procedures.

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