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Merlin G rcd fault
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<blockquote data-quote="davetheglitz" data-source="post: 13657" data-attributes="member: 173"><p>Can only think of a couple of possibilities:-</p><p></p><p>1) Have you checked that the neutrals of each CU are isolated from each other? Bit of a long shot - but you never know!</p><p></p><p>2) N-E fault on a circuit (possibly lighting - you didn't say that you had tested IR on that). The current flowing will be split between the neutral and earth so If a low current is taken then there is not enough leakage to earth to cause a trip - but if a high current device is used the leakage current will be high enough to cause a trip. This would give a seemingly random trip which ties in with what you are describing.</p><p></p><p>Hope this helps.</p><p></p><p>Dave</p></blockquote><p></p>
[QUOTE="davetheglitz, post: 13657, member: 173"] Can only think of a couple of possibilities:- 1) Have you checked that the neutrals of each CU are isolated from each other? Bit of a long shot - but you never know! 2) N-E fault on a circuit (possibly lighting - you didn't say that you had tested IR on that). The current flowing will be split between the neutral and earth so If a low current is taken then there is not enough leakage to earth to cause a trip - but if a high current device is used the leakage current will be high enough to cause a trip. This would give a seemingly random trip which ties in with what you are describing. Hope this helps. Dave [/QUOTE]
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Merlin G rcd fault
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