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Low Mains Voltage (~190-220v) - How to resolve?
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<blockquote data-quote="toontoonizer" data-source="post: 503763" data-attributes="member: 33054"><p>Yup that's fair enough. </p><p></p><p>We have a 3 phase supply coming in from the main line on the road &gt;50m away. I don't know what cables they use for this delivery. </p><p></p><p>The voltage at the 3phase cutout is 248v on 2 phases - it's ~235v on the other. This goes directly into the main house consumer unit which is right next to the meter. </p><p></p><p>Thereis a 25mm twincore+neutral armored cable running from an isolator switch direct to the annex (annex plus kitchen, boiler etc) consumer unit which is probably a 40-50m run. The other annex is further out but not in use at the moment. I'm also not sure but I think only one core of the twin core SWA is being used by the annex with kitchen etc. The other core is going to the other annex.</p><p></p><p>What makes thing unclear for me is that the voltage in the main house drops the same way, and when the DNO measured the voltage of the loaded phase it is also in line with what is being delivered at the annex (the farthest away measurable point). I've seen the incoming voltage at the annex reach 245v at it's peak. Would this still happen on an overloaded single phase?</p><p></p><p>It seems like that is indeed partly what the problem here is.</p></blockquote><p></p>
[QUOTE="toontoonizer, post: 503763, member: 33054"] Yup that's fair enough. We have a 3 phase supply coming in from the main line on the road >50m away. I don't know what cables they use for this delivery. The voltage at the 3phase cutout is 248v on 2 phases - it's ~235v on the other. This goes directly into the main house consumer unit which is right next to the meter. Thereis a 25mm twincore+neutral armored cable running from an isolator switch direct to the annex (annex plus kitchen, boiler etc) consumer unit which is probably a 40-50m run. The other annex is further out but not in use at the moment. I'm also not sure but I think only one core of the twin core SWA is being used by the annex with kitchen etc. The other core is going to the other annex. What makes thing unclear for me is that the voltage in the main house drops the same way, and when the DNO measured the voltage of the loaded phase it is also in line with what is being delivered at the annex (the farthest away measurable point). I've seen the incoming voltage at the annex reach 245v at it's peak. Would this still happen on an overloaded single phase? It seems like that is indeed partly what the problem here is. [/QUOTE]
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Low Mains Voltage (~190-220v) - How to resolve?
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