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<blockquote data-quote="ProDave" data-source="post: 481107" data-attributes="member: 6969"><p>The issue is fault currents. There are limits on how high final circuit impedance can be to ensure in the event of a fault the mcb (or fuse) disconnects within a specified time. If you have a very long cable that is too thin, the impedance even where it enters the house might be too high. So in the event of a fault, the mcb might not trip, instead the short circuit could remain passing a high fault current for a very long time.</p><p></p><p>I would still like to see some of the pages from the EICR the ones with lots of numbers on them.</p></blockquote><p></p>
[QUOTE="ProDave, post: 481107, member: 6969"] The issue is fault currents. There are limits on how high final circuit impedance can be to ensure in the event of a fault the mcb (or fuse) disconnects within a specified time. If you have a very long cable that is too thin, the impedance even where it enters the house might be too high. So in the event of a fault, the mcb might not trip, instead the short circuit could remain passing a high fault current for a very long time. I would still like to see some of the pages from the EICR the ones with lots of numbers on them. [/QUOTE]
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