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Electrician Talk Forum
Best way to find a short circuit between L and N? I.e a tripping MCB.
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<blockquote data-quote="ProDave" data-source="post: 558277" data-attributes="member: 6969"><p>For a L-N short it in not an insulation tester you need but a low ohms tester, same as you use for instance for measuring continuity on a ring final or doing R1+R2 tests.</p><p></p><p>To get >32A flowing to trip a 32A mcb requires the "load" (in this case the short circuit) to be less than 7.5 ohms so that should be easy to find.</p><p></p><p>Same as IR faults start splitting the circuit down into individual legs.</p><p></p><p>But first ask the question "What work has been done recently" and you mean ANY work done in the house. My favourite example was then the customer said none, I spent the best part of an hour to determine the faulty bit of cable was a light cable above the kitchen ceiling. At that point the customer said "we just had the kitchen flat roof replaced" I rest my case.</p></blockquote><p></p>
[QUOTE="ProDave, post: 558277, member: 6969"] For a L-N short it in not an insulation tester you need but a low ohms tester, same as you use for instance for measuring continuity on a ring final or doing R1+R2 tests. To get >32A flowing to trip a 32A mcb requires the "load" (in this case the short circuit) to be less than 7.5 ohms so that should be easy to find. Same as IR faults start splitting the circuit down into individual legs. But first ask the question "What work has been done recently" and you mean ANY work done in the house. My favourite example was then the customer said none, I spent the best part of an hour to determine the faulty bit of cable was a light cable above the kitchen ceiling. At that point the customer said "we just had the kitchen flat roof replaced" I rest my case. [/QUOTE]
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Best way to find a short circuit between L and N? I.e a tripping MCB.
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