Answer / niti

Earth fault means "the fault that occurs when the current
carrying conductor or live part get connected or touched
with earth"

for example

In 3 core Ar cable if one core damaged or punchered due to
mechanical injures that core touched with Armour, the fault
current pass through Armour to earth via panel

Answer / c.venkatesan

1.insulation failure
2.cable damaged by any excavtion works
3.overloads
4.due to dust
5.any animals are enter into the panel
6.any loose objects near the power system

Answer / not given

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