In message , "Dave Plowman (News)"
writes
In article ,
chris French wrote:
So, my thought so far is that there is some fault in the fixed wiring,
causing a high current draw, and that the MCB is faulty in some way,
hence the noise rather than tripping.

Does the above sound a reasonable diagnosis?

I can't really think of a fault which would result in a very high current
draw on the circuit with no load applied to it. I'd say even with the
smaller ECC used on early rings and one end disconnected and shorted to
line (the worst possible fault condition) it should still trip the MCB.

But a heavy current draw like this should be easily found with a simple
DVM - after disconnecting the ring from the CU of course.

OK, how would I go about it? I've got cheapy multimeter.
--
Chris French