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All, Thanks for your various thoughts and suggestions. To answer some of the questions:- Useless ****: yep, it's 30mA plugwash: yes, in fact I've managed to isolate it to a particular segment of one circuit and it is (spasmodically) reproducable (i.e. doesn't trip every time the light...

Just one in the kitchen - but it's on a different circuit and doesn't seem to have any effect: I did try disconnecting it and still had the tripping problem. Earth and any of the wires in the disconnected cable...

So I can ignore the floating AC right? Re: the neutrals, I've checked for continuity between the RCD and non-RCD neutral bus bars and there doesn't appear to be any connection... It only trips with one light switch and then only when the earth of a cable running to a second switch (2-way) is...

I've got a strange problem: replaced an old fuse box with a Consumer Unit before Christmas. Now a couple of lights (non-RCD) trip the RCD when switched off!? I've checked for cross neutrals, meggered all the cables. The only oddity I can find is that some of the cables appear to have a floating...