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Message: <blockquote data-quote="Bruspark" data-source="post: 558353" data-attributes="member: 20106">As others have said the issue with old fashioned incandescent lamps inthe old days was that a small voltage change produced a large change in light output. So room lights dimmed when the kettle went on.   Separate circuits helped a lot and the tighter volt drop requirement helped some more. It may be that the next version of the regs could review how many incandescent lights still exist and if anyone cares about them ...Until then my answer is that the regulations are set considering not only normal usage but many other conditions.  We have to work to them and do so gladly as it lets us be sure all reasonable eventualities are covered too.   Is the bloke at the pub well insured ?</blockquote>