Because although in theory the neutral should be at earth potential it
isn't always. And when servicing gas equipment, a spark from this
situation could be lethal - as an example. So isolation means just that.
Of course a faulty or poor earth could also result in sparks under some
conditions if the bonding isn't correct, so I often wonder why this isn't
*A clear conscience is usually the sign of a bad memory *
Dave Plowman email@example.com London SW
or perhaps modern automotive practices - my brother (trained landrover &
renault technician) tells me that switched returns are now commonplace.
Can't remember why he said that was. Something about increased longevity of
the switches or components I think.
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