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Cheers . Going to temporarily run 2 new cables from CU to where I have access to the ring (thus by passing the possible problem area ) At least it removes one more variable

I am retired electrician That is one reason I am somewhat confused. Haven't been near any of the ring circuit where it is damp in fact the ceiling had been finished ( where ring runs Above it ) and plasterer was working on a small wall area hence the switch. Convinced it's relevant to the...

Yes the cable is fully disconnected. And yes it's the RCD that trips when I turn on the MCB The ring main wiring was fine before the incident The ring is above the ceiling which only had a 3mm skim on it

EFL . The mcb was subsequently turned off to isolate the kitchen area. I have disconnected the wire from the spur that supplies the fan so it is no longer connected in anyways The mcb is off now because if I turn it on the RCD trips which cuts off all power to other MCBs

Hi Andy I have isolated the offending swicth . And just changed the mcb. Turn on the mcb and RCD trips.

The relevant sockets are all isolated now. So bypassing the area Just changed the MCB . No joy

Hi all .new to the community here and hoping for some thoughts Situation is that had a plasterer to do a wall in the kitchen . He tried to plaster around the socket (which is a switch to a fan ) the switch is a spur of kitchen ring which is under a RCD. When he moved the switch (which was...