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Earth Fault Loop Impedance Tests

Answer

Having a good Fault Loop Impedance on your home is critical for your safety.
 
Fault Loop  Impedance is tested to ensure that if an active to earth fault occurs then the total impedance in the fault loop path (consisting of all conductors, connections and contacts as well as the transformer windings) must be low enough to generate sufficient fault current to operate the circuit protective device within an adequate time. 
 
This will cause the protective devices in your home to trip.
 
 
 

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