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Parallel Earth Paths In Steel Re-Inforced Concrete
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<blockquote data-quote="binky" data-source="post: 343904" data-attributes="member: 490"><p>the test results were ok for most of the circuits when we tested prior to starting the job, but on re-testing we have found several circuits have suddenly jumped by anything upto 70 Ohms, and are a bit of a loss as to explain why. Now it could have been our handiwork, but we have gone through several circuits with a fine tooth comb, and get these new figures even at the the very first light fitting on the circuit. So in short the circuits can be shown to now fail on parts that we have not altered at all. We suspect the old ffittings being all metal construction were making contact with the steel work of the building and providing parallel earth paths, where as the new fittings being typical plastic construction are not doing this, revealing that the circuits that we originally though to be ok, were actually duff all along.</p></blockquote><p></p>
[QUOTE="binky, post: 343904, member: 490"] the test results were ok for most of the circuits when we tested prior to starting the job, but on re-testing we have found several circuits have suddenly jumped by anything upto 70 Ohms, and are a bit of a loss as to explain why. Now it could have been our handiwork, but we have gone through several circuits with a fine tooth comb, and get these new figures even at the the very first light fitting on the circuit. So in short the circuits can be shown to now fail on parts that we have not altered at all. We suspect the old ffittings being all metal construction were making contact with the steel work of the building and providing parallel earth paths, where as the new fittings being typical plastic construction are not doing this, revealing that the circuits that we originally though to be ok, were actually duff all along. [/QUOTE]
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Parallel Earth Paths In Steel Re-Inforced Concrete
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