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Automatic disconnection of supply
The ‘protective measure - automatic disconnection of supply’ is the standard method used in most applications and almost by default .
To comply with the ‘protective measure’, the following are required:
1 - basic protection; and
2 - protective earthing and protective equipotential bonding; and
3 - automatic disconnection in the event of a fault.
Path of Earth fault loop
Impedance TN-C-S system
Path of Earth fault loop
Impedance TT system