I have just finished my wiring in the new garage, so I put the 40A mcb in the house consumer unit on, then go down the garage and switch the rcd in the garage cu on, everything fine. Then I switch the 32A mcb on for the sockets and it trips the rcd in the house. I leave the 32A mcb and the rcd on in the garage, and I go back up and reset the rcd in the house, everything fine. As soon as I plug a radio into a socket in the garage and switch on, the rcd in the house trips again. Can anyone shed any light into what is going on?
By the way, the cu in the house is set up as a split load unit. The main switch is 100A double pole, and it feeds the lighting circuits and also the 30mA 80A rcd. This in turn feeds all the power circuits in the house and also now the garage.
Should the garage circuit be fed from an mcb straight off the main switch, and not from the rcd?
I have done the usual tests on the circuits before I switched on. There are no shorts to earth, insulation resistance is good, polarity is good etc.
Is it possible that the rcd in the garage cu could be bad? It was an old one that I had lying around, could it possibly cause this problem?
By the way, the cu in the house is set up as a split load unit. The main switch is 100A double pole, and it feeds the lighting circuits and also the 30mA 80A rcd. This in turn feeds all the power circuits in the house and also now the garage.
Should the garage circuit be fed from an mcb straight off the main switch, and not from the rcd?
I have done the usual tests on the circuits before I switched on. There are no shorts to earth, insulation resistance is good, polarity is good etc.
Is it possible that the rcd in the garage cu could be bad? It was an old one that I had lying around, could it possibly cause this problem?