On Wednesday, 14 March 2018 17:48:30 UTC, Rednadnerb wrote:

It's mice.

By a process of elimination I have narrowed the problem down to two lengths of cable, both run under the hall floor.

Thank you all. I now just have to decide whether the occasional RCD trip is worth taking up the floor boards for.

If an RCD trips it's because stuff is shorting out. That's a fire risk.


NT