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Thanks all. There do appear to be two separate earth cables coming out of the wall, one which seems to simply go from the back box earth terminal to the dimmer switch earth terminal, but then also another coming out of the main set of cables which is not attached to anything. Is it safe to...

Hi, my 1 way 2 gang dimmer switch has stopped working, and when I have come to replace it I noticed that although there is an earth wire from the wall socket to the dimmer switch, there is also another earth wire which is loose. I assume this should be connected - where should it connect to?