The Natural Philosopher wrote:

Terry Pinnell wrote:
Terry Pinnell wrote:
Hasty correction!

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OK, but this is where I'm still obviously being dense. Given a normal,
properly working setup, can you please summarise what *should* happen
and which switches in the main CU should open for each of the
following events:

1. A device on the LH side (non RCD) develops a short.

My assumption: it opens that MCB, but power remains for all other LH
and RH (RCD) circuits; and it probably blows a plug fuse too.

(The 'main LH switch' is MANUAL only, as you pointed out.)


Not necessarily. See previous post. RCD's may trip as well.

So that could be a possible explanation for the behaviour described in
my opening post?

--
Terry, West Sussex, UK