In reply to mypyrex: we have had nightmares for years with RCCZD tripping, got up this morning to find again that it had tripped again.
It is a busy house, lots going on all the time daughters , with their gadgets , boyfriends staying over with theirs, son in law plugging in stuff here and there, as well as the normal stuff.
It can go 3/4 times a day or not for months. I have tried isolating all the circuits in turn to see if there is a pattern when I turn them back on to see if it trips, but it seems random.
I was going to change the RCD out, but, I have a feeling that it might be more to do with 'spikes' in the supply, otherwise how could it cope with MONTHS of the busy household stuff, all the gadgets, power tools. and all the stuff that switches on and off, boilers, fridges, freezers, dishwashers, tumble dryers , hair dryers ,straighteners,etc. etc. and then.go 5 nights in a row, or 3 or 4 times in a day when nothing has changed?
Any clues out there? I don't want to waste money on a new RCCD and a spark if I don't need to.