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Do-It-Yourself (DIY) Question & Answer Forum
Isolator for Sub Main
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<blockquote data-quote="kme" data-source="post: 79490" data-attributes="member: 113"><p>I`m backing Deke with the comment r.e. TT supplies. Don`t have BRB to hand; but there is a reg. with respect to TN systems not requiring N to be isolated at main switch; as it can be taken to be at or near CPC potential.</p><p></p><p>As for the borrowed Neutral scenario, with a cct on your isolated board having it`s N connected to a cct from another board - safest option is, if you have 4 pole disconnect, to put a jumper between board N and casing. Safe all ways round!</p><p></p><p>KME</p></blockquote><p></p>
[QUOTE="kme, post: 79490, member: 113"] I`m backing Deke with the comment r.e. TT supplies. Don`t have BRB to hand; but there is a reg. with respect to TN systems not requiring N to be isolated at main switch; as it can be taken to be at or near CPC potential. As for the borrowed Neutral scenario, with a cct on your isolated board having it`s N connected to a cct from another board - safest option is, if you have 4 pole disconnect, to put a jumper between board N and casing. Safe all ways round! KME [/QUOTE]
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