Systems with earthing through high resistance have low phase-to-ground fault currents so require high sensitivity of FI . In insulated neutral systems and systems with earthing through a Petersen Coil, ground faults cannot be located with classical FI's at all.
2.
Well thank you everyone for the contribution but a ship is not grounded in a conventional way . If they connect the ground to the hull there is a possibility of electric shock is someone touches the hull & we know salt water ( sea water ) is a great conductor of electricity but ship is not grounded to the sea water by using metal projection like the way it is done for normal grounding . " Insulated neutral system " is preferred in a ship but in that case where is the neutral connected ? ? anybody . . ? Preceding talk ) 13 : 46, 16 October 2011 ( UTC)
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