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Answer Posted / sivaraman
as said above v cant provide protection against all the
faults by groundin neutral. its onli 2 protect from phase 2
ground faults. wenever phase 2 ground faults occurs,
current wil take the return path 2 neutral 4m ground.so
the entire current wat that system delivers wil flow thro
the same phase wich was affected n to the groun(as its grnd
fault)then from ground to neutral(as its grounded). thus it
attains a closed path. the fuse of the same phase wil blow
out. thus by it protects the healthy phases n also the load
system
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