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When you say 'system' is the building supply 2 phases as you describe without a neutral or is this just a final circuit.Is such a system (230 volt L-L) legal under BS7671 or IEC 60364? Do I need double pole switches for light fittings?
Either way the answer is yes in most places on the planet (including Derbyshire....wherever it may be), you'd need every point of consumption including light fittings to be supplied by a double pole switch.
I think England is in Derbyshire and Derbyshire is part of the UK, but I might be wrong .
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