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If I have a 480 circuit breaker and I want to protect the system from ground fault (i.e. install ground fault protection to this circuit breaker) How the connection for this circuit will be ?? CT, relay, 480/120 transformer and the main circuit breaker and its shunt trip How they are going to be connected to each other
And got the following answer:
connect the EFR between CT and OCR relay star points. The setting of EFR is usually 20% of OCR setting.Connect trip contacts to trip circuit or bus