Ground Fault Detection Systems
Arcing Ground Fault Detection System - Bulletin 1409
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Low-level (arcing) ground faults are below the fuse or
circuit breaker rating and therefore go undetected until a much larger
problem develops. The Allen-Bradley Arcing Ground Fault Detection System
is designed to sense these low-level faults and either drop out the motor
controller or operate a shunt-trip circuit breaker to clear the fault.
The Bulletin 1409 Arcing Ground Fault Detection Systems are intended for
equipment protection only. These systems are not Ground-Fault Circuit-Interrupters
for personnel protection as defined in Article 100 of the U.S. National
Electric Code. The Bulletin 1409 is available in two designs, Class I
and Class II. The Class I Arcing Ground Fault Detection Systems are intended
for use with shunt-trip circuit breakers or medium voltage controllers.
These Class I systems do not contain a high-current inhibit circuit.
The Class II Arcing Ground Fault Detection Systems are designed for use with motor
starters or contactors (controllers) to interrupt low-level ground faults. These detection
systems incorporate a high-current inhibit circuit that guards against the controller
opening when the fault current exceeds the controller interrupting capacity. Ground
fault currents exceeding the interrupting rating of the controllers are designed to be
cleared by the short circuit protection device (fuse or circuit breaker).
Both Class I and Class II Arcing Ground Fault Detection Systems consist of two
parts - a relay and a sensor. The Arcing Ground Fault Relay contains all the
detection, adjustment and output circuitry. The Arching Ground Fault Sensor is a
special two-winding current transformer. Operation of the ground fault detection
system is indicated by the relay toggle.
Approvals:
Wiring Diagram
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