Tuesday night - switched on fluorescent light - took several seconds to come on (usually no delay).
Wednesday night - switched on fluorescent light - did not come on.
Thursday morning - all lights & some sockets not working.
Looked at consumer unit - one of the two RCDs had activated; all MCBs still on. Switched off all MCBs, switched on RCD, tried MCBs one at a time - downstairs lighting circuit caused RCD to activate ; it took several seconds to activate. Left that MCB off.
Dismantled fluorescent light - choke/coil? had burnt out.
Tried MCB again - RCD activated again.
The double switch for the fluorescent light also serves an outside light; there is no sign of water ingress. Have disconnected all wiring to this double switch.
Tried MCB again several times - if RCD is on when I try, now activates RCD instantly and cannot switch MCB fully on. If RCD is off when I try, I can put MCB fully on but cannot put RCD on.
Any suggestions for locating the problem please?
Wednesday night - switched on fluorescent light - did not come on.
Thursday morning - all lights & some sockets not working.
Looked at consumer unit - one of the two RCDs had activated; all MCBs still on. Switched off all MCBs, switched on RCD, tried MCBs one at a time - downstairs lighting circuit caused RCD to activate ; it took several seconds to activate. Left that MCB off.
Dismantled fluorescent light - choke/coil? had burnt out.
Tried MCB again - RCD activated again.
The double switch for the fluorescent light also serves an outside light; there is no sign of water ingress. Have disconnected all wiring to this double switch.
Tried MCB again several times - if RCD is on when I try, now activates RCD instantly and cannot switch MCB fully on. If RCD is off when I try, I can put MCB fully on but cannot put RCD on.
Any suggestions for locating the problem please?