i have had a new circuit board fitted and last night my power went off, i lost all lighting and no power to any plug sockets in whole house.

i noticed the rcd switch had tripped, i tried to push swith onto on position but keeps tripping out

i have switched off every switch on my plugs and have no power to any sockets only power to my lighting

paul, January 2009

What i would do is switch off all your light,s see if the rcd stay,s in if it do,s then switch on light,s one at a time to see if rcd trip,s

pete, January 2009

many thanks matt will try once home

regards,

paul

paul, January 2009

Paul

Its going to be a process of elimination and going backwards to come forwards. My suggestion is to:-
01 - Switch all your mcb's OFF to every circuit on the board.
02 - Switch all your plugs on your sockets back on.
03 - Switch the RCD to on
04 - One at a time turn each mcb back on
05 - At the first RCD trip OFF, turn the mcb off that appeared to cause the RCD to trip.
06 - Carry on turning on the balance of the mcb's
From your description above I would assume that something on socket circuit(s) is causing the RCD to trip.
01 - turn off that circuits mcb & Switch back off/unplug all devices on the circuit causing the failure.
02 - Switch on the RCD
03 - Switch on the mcb causing the failure. If the RCD fails without any appliances on then you have a circuit failure.
04 - Proceed turning on one at a time your appliances.
05 - If an appliance being turned on trips the RCD then you have found a faulty appliance.

I would assume that whoever installed the new board with RCD would have carried out an insulation resistance test, therefore making a circuit wiring issue a slim cause.

Matt, January 2009