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It's normal to trip the RCD if bare wires touch even on an isolated circuit.
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It's already been mentioned but the reason you can still trip the RCD is because all the neutrals are connected to the neutral bar associated with that RCD. It shouldn't happen if you get inside the CU ( with the power disconnected of course) and disconnect the circuits from the breaker.
inchpincher
Airhead
@lmamammal
I'm pulling drywall down between 4 rooms to turn them into 5 rooms.
I have isolated the circuits with all the switches and sockets from the board + checked all with non-contact pen. Got a Bosch D-tect 120 also to check for any hidden nasties.
I just removed the first face plate from socket and removed the cables and managed to trip the main switch on the board.
Is there anything I might have missed or could this happen by the cables touching each other going through the hole on the drywall socket?
P.S. I'm getting a registered sparky in to redo all the connections in a couple weeks time.
@Airhead perhaps?
Cheers.