Earlier today, whilst the only electrical item plugged in was a kettle (not being used) and a new radio (switched on) - no fridge, no cooker, no lights on, nothing else - the stand alone RCD tripped, and will not reset.
The wiring configuration is as follows:
Meter. One pair tails to stand-alone RCD.
Two pairs of tails out from RCD, one pair to 6 way C.U. and the other pair to 1 way C.U. which is dedicated to the cooker radial circuit, protected by 32 amp MCB.
I disconnected the radio and kettle and opened up a socket at random. With with the RCD in the OFF position but the CU main switch on, the live terminal is still live. And so is the Neutral! This is also the case on the lighting circuit at the ceiling rose. This showed up with a neon screwdriver tester.
I then took the cover off the RCD. The feed live was (of course) live and the neutral was not live, but on the load side, with the two pairs of tails, it showed live on both live and neutral terminals.
Does anyone know where the fault might lie, and can anyone explain how sockets can still be live when the RCD, which protects the whole CU, has tripped?
Any advice would be gratefully received.