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<blockquote data-quote="seajayess" data-source="post: 78660" data-attributes="member: 603"><p>Ok last Saturday we had to install a new supply to a large freezer in a food processing factory, so 10mm 5 core SWA from a Sub board to control panel all tested out fine and left isolated for refrigeration engineers to finish of their installation.</p><p></p><p>Got called back today as LED's on panel were glowing although panel was still isolated. After 2 hours trying to find out why ended up with only 1 explanation, that due to the amount of currents in the factory there was some current traveling up the Neutral enough to light LED's.</p><p></p><p>But while testing the SWA with the cable completely removed from C/U and freezer panel so just a piece of SWA with nothing connected to it you could get 238 volts between it and the supply line conductors and nothing to Neutral or Earth so why is there a potential difference.</p><p></p><p>How is this possible when there is no connection to anything ?</p><p></p><p>To me it is somehow connected to Earth, but how. We did an insulation resistance test on it and there is no connection to anything in the building.</p><p></p><p>Hope this makes sense CJS</p></blockquote><p></p>
[QUOTE="seajayess, post: 78660, member: 603"] Ok last Saturday we had to install a new supply to a large freezer in a food processing factory, so 10mm 5 core SWA from a Sub board to control panel all tested out fine and left isolated for refrigeration engineers to finish of their installation. Got called back today as LED's on panel were glowing although panel was still isolated. After 2 hours trying to find out why ended up with only 1 explanation, that due to the amount of currents in the factory there was some current traveling up the Neutral enough to light LED's. But while testing the SWA with the cable completely removed from C/U and freezer panel so just a piece of SWA with nothing connected to it you could get 238 volts between it and the supply line conductors and nothing to Neutral or Earth so why is there a potential difference. How is this possible when there is no connection to anything ? To me it is somehow connected to Earth, but how. We did an insulation resistance test on it and there is no connection to anything in the building. Hope this makes sense CJS [/QUOTE]
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