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Do-It-Yourself (DIY) Question & Answer Forum
TN-C-S Pitfalls
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<blockquote data-quote="ProDave" data-source="post: 250575" data-attributes="member: 6969"><p>With say TT, if the N ruptures, yes it will float up to close to 230V. But N is an insulated conductor. You would not normally be able to touch a N conductor, so what difference does it make what potential it is.</p><p></p><p>With the TNC-S example, it's the fact E can rise as well. Now that's a different ball game. LOTS of things are connected to E and easy to touch. So take that E outside the building and put it in a situation where you could touch exported E and local E together, you have a problem.</p></blockquote><p></p>
[QUOTE="ProDave, post: 250575, member: 6969"] With say TT, if the N ruptures, yes it will float up to close to 230V. But N is an insulated conductor. You would not normally be able to touch a N conductor, so what difference does it make what potential it is. With the TNC-S example, it's the fact E can rise as well. Now that's a different ball game. LOTS of things are connected to E and easy to touch. So take that E outside the building and put it in a situation where you could touch exported E and local E together, you have a problem. [/QUOTE]
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