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Thanks again, much appreciated

Thanks for the responses, much appreciated.

Thanks for the information.

OK, maybe not a sparks question but with an AC supply, why do appliances have phase and neutral wiring? Would it matter which way round they are wired at the plug e.g. A vacuum cleaner? A simple question, but remarkably difficult to get a definative answer. Thanks in anticipation.

Is it possible to carry out an Insulation Resitance test on "fixed wired" appliances (wall heaters, hand dryers etc.) without having to isolate or disconect the appliance? I'm told that there is a Megger machine that can do this, but I've yet to find it. Any help would be appreciated. Cheers