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Unexplained volt reading from domestic dual rate meter installation
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<blockquote data-quote="theHeatingEngineer" data-source="post: 495838" data-attributes="member: 32685"><p>A domestic hot water cylinder was not heating properly on E7 so I popped in early to see what was happening while the economy circuit was live. It's always a good idea for the thermostat to be turned up... tends to heat the water better!</p><p></p><p>While doing the usual tests at the immersion heater I found this: L-N (230v), L-Pe ... ZERO volts! Dodgy earth? And then N-Pe 230v !! What's this??</p><p></p><p>I would say the supply is TNCS. I chased through the wiring and found 230 volts across Pe-N in the consumer unit (only part of it reproduced below). I just don't see how that can be possible...?</p><p></p><p><img src="https://talk.electricianforum.co.uk/uploads/imageproxy/ad999d913ea4e75b6cee3553824699eb.jpeg.1709856b95643a1d4cefc317e8b85abc.jpeg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="theHeatingEngineer, post: 495838, member: 32685"] A domestic hot water cylinder was not heating properly on E7 so I popped in early to see what was happening while the economy circuit was live. It's always a good idea for the thermostat to be turned up... tends to heat the water better! While doing the usual tests at the immersion heater I found this: L-N (230v), L-Pe ... ZERO volts! Dodgy earth? And then N-Pe 230v !! What's this?? I would say the supply is TNCS. I chased through the wiring and found 230 volts across Pe-N in the consumer unit (only part of it reproduced below). I just don't see how that can be possible...? [IMG]https://talk.electricianforum.co.uk/uploads/imageproxy/ad999d913ea4e75b6cee3553824699eb.jpeg.1709856b95643a1d4cefc317e8b85abc.jpeg[/IMG] [/QUOTE]
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Unexplained volt reading from domestic dual rate meter installation
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