On 15/12/2013 23:59, Jim K wrote:
Dave W

No apparent way in!

Moulded brown plastic with 3 terminals.

How come contacts welded with a 30ma rcd installed & working?

The fault was an overcurrent rather than an earth fault current. So the
RCD trip was probably just in response to the transient and a reflection
on the fact that its probably sensitised to the point of being close to
tripping due to the leakage normally present in the circuit.

So you would have had at least 30A through the switch briefly.


--
Cheers,

John.

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