"Lee" wrote in message
...
Mogweed wrote:

so no short-circuits, but yet the RCD trips. What's the problem - more
importantly, what's the solution to the problem? )

Have you checked for a misplaced neutral?
'Tis a common mistake on a split load CU...

Lee

Ah, now then, I haven't checked for that - mainly because I didn't know that
a neutral could be misplaced. They all go to a common bar don't they?

Mogweed.