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Tripping mcb
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<blockquote data-quote="Geoff1946" data-source="post: 501030" data-attributes="member: 28452"><p>Not specifically, but I can give you some pointers. RCDs trip for earth faults, so you don't have that.</p><p></p><p>Fuses and MCBs trip for over current. </p><p></p><p>Hence, either the cumulative current of your saw plus whatever was running in the house exceeded your MCB rating, without exceeding the fuses ratings, OR it was a time issue.</p><p></p><p>MCBs are a lot faster than fuses. If you put a short circuit fault at the end of a string of fuses with an MCB at source there is every chance that the MCB will trip before any of the fuses blow.</p><p></p><p>Further thought, motors like a saw have a large starting surge, possibly several times normal running current, so is it on starting that the MCB trips?</p></blockquote><p></p>
[QUOTE="Geoff1946, post: 501030, member: 28452"] Not specifically, but I can give you some pointers. RCDs trip for earth faults, so you don't have that. Fuses and MCBs trip for over current. Hence, either the cumulative current of your saw plus whatever was running in the house exceeded your MCB rating, without exceeding the fuses ratings, OR it was a time issue. MCBs are a lot faster than fuses. If you put a short circuit fault at the end of a string of fuses with an MCB at source there is every chance that the MCB will trip before any of the fuses blow. Further thought, motors like a saw have a large starting surge, possibly several times normal running current, so is it on starting that the MCB trips? [/QUOTE]
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