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Isolator for Sub Main
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<blockquote data-quote="Andy™" data-source="post: 79562" data-attributes="member: 2012"><p>and the power will flow through any connected equipment to that board, so all phases will also be at same potential as neutral</p><p></p><p>4 pole isolation could be better in this case though - if you only isolate phases, and test dead, all will appear dead. cut the neutral (i.e whilst your doing work needed done), then everything will become live with possible fatal results. with 4 pole isolation, when testing 'dead' after isolation, it should appear live and show something is wrong and further action/isolation taken before going any further</p><p></p><p>of course borrowed neutrals from another board should never happen, but then we all know the skills of some people</p></blockquote><p></p>
[QUOTE="Andy™, post: 79562, member: 2012"] and the power will flow through any connected equipment to that board, so all phases will also be at same potential as neutral 4 pole isolation could be better in this case though - if you only isolate phases, and test dead, all will appear dead. cut the neutral (i.e whilst your doing work needed done), then everything will become live with possible fatal results. with 4 pole isolation, when testing 'dead' after isolation, it should appear live and show something is wrong and further action/isolation taken before going any further of course borrowed neutrals from another board should never happen, but then we all know the skills of some people [/QUOTE]
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