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Do-It-Yourself (DIY) Question & Answer Forum
Chose this part of the forum as i'm not a sparky
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<blockquote data-quote="Phoenix" data-source="post: 552121" data-attributes="member: 8133"><p>It sounds like there is a very high resistance/open neutral connetion, it is floating upto half supply voltage through capactive coupling, and your high resistance volt meter does not put any load on it, so you see that voltage, if you used a moving coil type meter it would likely be far lower. If you plugged a load like a heater it, chances are it would disappear totally, with the neutral, pulled upto line potenial (so you'd then see 0v between red and black, 240v between black and yellow, and you'd still have 240v red to yellow)</p><p></p><p>I'm assuming its armoured comming into the garage, its likely twin and earth in the house, try and find the joint and inspect that and see what voltages you get there</p></blockquote><p></p>
[QUOTE="Phoenix, post: 552121, member: 8133"] It sounds like there is a very high resistance/open neutral connetion, it is floating upto half supply voltage through capactive coupling, and your high resistance volt meter does not put any load on it, so you see that voltage, if you used a moving coil type meter it would likely be far lower. If you plugged a load like a heater it, chances are it would disappear totally, with the neutral, pulled upto line potenial (so you'd then see 0v between red and black, 240v between black and yellow, and you'd still have 240v red to yellow) I'm assuming its armoured comming into the garage, its likely twin and earth in the house, try and find the joint and inspect that and see what voltages you get there [/QUOTE]
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