Answer / rk

As there is a vast difference between the Earth & Neutral
The ground or "earth" wire is a circuit's safety protective
wire that normally carries no current.

It is there to force a fuse to blow or a circuit breaker or
GFCI to trip if a fault condition occurs in any appliances,
their flexible cords or plugs that are connected into the
circuit.

By carrying away the excess current in a fault condition -
which should cause the protecting fuse to blow or circuit
breaker to trip - the "ground" or "earth" wire protects the
building and its occupants because the power should be cut
off before anyone gets electrocuted or any overloaded
circuit wiring or appliances catch on fire.

The neutral is the normal "return" wire: in systems where
the load is supplied from only one hot (or "live") wire, the
neutral completes the circuit and carries current back from
the load to the power station.

All the neutral and ground (or "earth") wires in a building
are tied or linked together at the incoming service main
breaker panel. This is the only place they should ever be
tied together because it is "upstream" of all the fuses
and/or circuit breakers protecting the hot (or "live") wires
for the various circuits installed in the building.

Warning: we must never assume that a neutral is safe to
touch: it has to be checked with a voltmeter or a voltage
indicator to be sure it is not "live". This is because a
neutral wire is designed to carry current under normal
circumstances.

So, if a neutral wire going back to the incoming main
breaker panel has not been properly connected - or suffers a
deliberate disconnection or some accidental damage which
causes it to break - then it and any neutral wires connected
to it further downstream will go live up to the break
because of being connected to the downstream loads which
still have hot feeds coming into them!

That is why we should never use a neutral as a substitute
for a proper, separate, ground or "earth" wire.

Answer / anil

anil

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