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
