On Sun, 15 Mar 2009 22:43:42 +0000 (GMT), "Dave Liquorice"
wrote:

I am also puzzled because there seem to be split load boxes with two
RCDs. How does one trip without taking out the other?

'cause they aren't wired in series? I would assume that the incoming mai=
ns
goes through the main switch then splits to each RCD. This gives you the=

required 30mA shock protection on all circits whilst maintaining some
circuits if one RCD trips.

Thanks. I haven't got a split load box so hadn't realised the busbars
were in parallel; that explains it.