In reply to MG:
> I have been putting some new light switches on an existing circuit. All fine...until one doesn't work. I *think* I know why but before I short something out, can anyone answer this:
> I have a 3-gang switch wired as expected but with a short extra wire linking two of the com terminals. Is this an electrician's shortcut for getting a live wire from one light to another? Or something else?
When I google lighting wiring circuits , I get some good results for the various systems .