8. Protective Circuits
Protective wire in a three-phase current system
Earthing (Three-phase a-c three wire system)
Earthing (Three-phase a-c four wire system)
Protective Earthing
Reflux of the leakage current via water pipe system (1)
Reflux of the leakage current via earth
IF leakage current, In rated current of the fusible cut-out
Circuit for Generating Protective Low Voltage
Fault-voltage Protective Circuit
in a three-phase three-wire system
1 fault-voltage circuit breaker
Fault-current Protective Circuit
in a three-phase four-wire system
1 fault-current circuit breaker
