Indeed. The calculations I've just posted indicate that buried 2-core 16mm² SWA would seemingly be OK for 13A of power, but not for lighting. To get acceptable voltage drop for lighting at 13A total load, the op would probably need 25mm². As I wrote yesterday, this means that a good few hundred pounds could be saved by having, say, (car) battery operated lighting.
Something else that wasn't true.
Indeed. We discussed that here recently and,as you say, it does seem very odd. Some people seemed to think that some 'modern' lighting may be particularly sensisve to undervoltage, but I'm not sure I'm convinced that they're any more sensistive than a lot of non-lighting loads. With good-old incandescent lighting, of course, the worst that can happen is that it gets a bit darker (and the life of lamps may be affected)!
Try to understand. I was demonstrating something which should be of interest/use to some people here (even if not you) - namely the limit of how much temperature-related reduction in voltage drop one can achieve by generous cable sizing. I suppose not everyone can understand the use of limiting situations to investigate such issues, but I would hope that it's a lot more potentially useful than references to witches'body parts.
At 216.2V your resistive load is no longer the 3kW it was at 230V.
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