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Thanks, that's pretty much what I thought. I have got one of those pens which tell you when stuff is live so I can use that and be careful. It does use a DIN rail. Will have to be tomorrow morning now it's dark.
At the moment the RCD is tripping no matter which fuse is on. I've tried various individually and it trips almost straight away or straight away. But if I can swap the RCDs I'll know whether it's a faulty RCD or not as we never have problems with the other one which covers the back of the flat.
Sparky did check it and sign it off but that was a few years ago. We pretty much had the place rewired and the tripping issue didn't happen for along time, but has recently started happening more regularly, so something seems to have changed. Don't think I've got anything like that.
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Fox
@lynx
Swapping RCD is quite straight forward. Your fuseboard should be a din railed system. Turn power off to the board and take the front cover off and swap the RCD over.
If you have built your own computer, you'll be fine.
If it were me, I'd unplug everything I take the led lights out and put them back in one by one. Leaving them on for a bit, to warm up and see if there is an issue with current returning to earth or a neutral and positive in balance.
EDIT - Stupid question, did a sparky check the system and sign it off? Did by chance he leave any paperwork giving any electrical values for the system?