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<blockquote data-quote="Murdoch" data-source="post: 420278" data-attributes="member: 24445"><p>Last year I spent a while tracking down a fault in an new loft conversion - a hi integrity CU.</p><p></p><p>The loft lights and all the smokes were on a RCBO</p><p></p><p>If the customer was cooking and or washing, the lighting RCBO would trip. The kitchen/utility sockets were on RCD1 as was the cooker.</p><p></p><p>Using my trusty earth leakage tester, I could see that the combined leakage across the kitchen sockets &amp; cooker was about 20mA. The IR for the cables was all good but as soon as the appliances were in use the problems started.</p><p></p><p>The leakage across the lighting circuit was about 7mA - loads of LED's etc, etc</p><p></p><p>In the end, I located a smoke alarm "signal cable to earth fault between 2 of the smokes! Not a neutral to earth, not a live to earth. Aico said it wouldn't trip the RCBO however, the L-E was good, the N-E was good, the Signal to E was a dead short!</p><p></p><p>I disconnected the signal cable at both smokes and hey presto the problem disappeared.</p><p></p><p>Had me scratching my head for a while and no testing at the CU would have revealed this! Using the earth leakage meter I could see that when the smokes were plugged back in the leakage rose!</p><p></p><p>A fun one, but very frustrating!</p></blockquote><p></p>
[QUOTE="Murdoch, post: 420278, member: 24445"] Last year I spent a while tracking down a fault in an new loft conversion - a hi integrity CU. The loft lights and all the smokes were on a RCBO If the customer was cooking and or washing, the lighting RCBO would trip. The kitchen/utility sockets were on RCD1 as was the cooker. Using my trusty earth leakage tester, I could see that the combined leakage across the kitchen sockets & cooker was about 20mA. The IR for the cables was all good but as soon as the appliances were in use the problems started. The leakage across the lighting circuit was about 7mA - loads of LED's etc, etc In the end, I located a smoke alarm "signal cable to earth fault between 2 of the smokes! Not a neutral to earth, not a live to earth. Aico said it wouldn't trip the RCBO however, the L-E was good, the N-E was good, the Signal to E was a dead short! I disconnected the signal cable at both smokes and hey presto the problem disappeared. Had me scratching my head for a while and no testing at the CU would have revealed this! Using the earth leakage meter I could see that when the smokes were plugged back in the leakage rose! A fun one, but very frustrating! [/QUOTE]
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