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Unexpected Reading Between Earth And Neutral
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<blockquote data-quote="ProDave" data-source="post: 382894" data-attributes="member: 6969"><p>An RCD detects imballance between L and N.</p><p></p><p>So a correct circuit, all the current leaving L will pass through the load and back through N so there will be no imballance.</p><p></p><p>Remember N is joined to E at the substation.</p><p></p><p>Now introduce a N-E fault.</p><p></p><p>SOME of the current will now return to the substation via E and literally through the earth.</p><p></p><p>So now there will be a difference in the current flowing out of L and the current returning via N, so the RCD will trip.</p></blockquote><p></p>
[QUOTE="ProDave, post: 382894, member: 6969"] An RCD detects imballance between L and N. So a correct circuit, all the current leaving L will pass through the load and back through N so there will be no imballance. Remember N is joined to E at the substation. Now introduce a N-E fault. SOME of the current will now return to the substation via E and literally through the earth. So now there will be a difference in the current flowing out of L and the current returning via N, so the RCD will trip. [/QUOTE]
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