Answer Posted / kj

If you mean that we do not earth the neutral?

In a perfect situation this would be good and reduce the
risk of electric shock.

Unfortunately in real life it can only work in small
situations - using an isolation transformer for a handheld
light for example.

In large installations there is always a risk of failures
of insulation or machines. This would then cause a
connection of the neutral or phase to earth and therefore
it would no longer be ground free. The other thing is that
no insulation is perfect and there will always be leakage
with the same result.

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