"John Rumm" wrote in message
news:4377cad5$0$82650$ed2619ec@ptn-nntp-
You did not say where you got the spark from (i.e. if it was to the
neutral connector itself, or to earth). If it was to earth you need to
remember that a neutral ought to be regarded as a live conductor. It may
have a voltage on it that is some way away from earth potential. How far
will depend on how "stiff" the supply to your property is and how many
other properties share "your" neutral. The result is that it can be a few
volts above ground - certainly enough to pass a reasonble current to
earth.

--
Cheers,

John.

Yup it was certainly enough to throw my glasshouse breaker when earth was
touching neutral on an otherwise disconnected circuit.

Pete
www.thecanalshop.com