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The two wires going to ceiling rose are red and black, the rest of the cables are black. The problem is that the priginal switch was smashed during renovations to bathroom so I was unable to copy it. What voltages should I be looking for to find out what the other cables are?

I'm replacing switch from double to single as one light has been taken away and therefore double has been taken away. I think that I have mixed wires up so is there a way of finding out which are the common to wires and should I line at common on switch. I belled wires out going to ceiling...