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Do-It-Yourself (DIY) Question & Answer Forum
TN-C-S Pitfalls
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<blockquote data-quote="r0baj0b" data-source="post: 250550" data-attributes="member: 17425"><p>A conversation came up between myself and my lecturer (I am nearing the end of my apprenticeship) about the reasons for not taking the earth outside of a building on a TN-C-S system to, say, a shed. He tried to explain it but couldn't quite figure out how to.</p><p></p><p>With reference to this thread I found (<a href="http://www.talk.electricianforum.co.uk/question-answer-board/16596-tnc-s-earth-external-building.html" target="_blank">http://www.talk.electricianforum.co.uk/question-answer-board/16596-tnc-s-earth-external-building.html</a>) I don't understand how, if the supply neutral was lost, everything earthed in the house would become live, and how the exported earth would be at the same potential as the star point of the transformer.</p><p></p><p>At one job I was at, the DNO came to move the intake, and installed a TT system, as opposed to a TN-C-S as we were expecting. When asked, the engineer said something about it being dangerous for them to install TN-C-S (I can't remember exactly what he said as it was over a year ago)</p><p></p><p>What other pitfalls are associated with this system?</p></blockquote><p></p>
[QUOTE="r0baj0b, post: 250550, member: 17425"] A conversation came up between myself and my lecturer (I am nearing the end of my apprenticeship) about the reasons for not taking the earth outside of a building on a TN-C-S system to, say, a shed. He tried to explain it but couldn't quite figure out how to. With reference to this thread I found ([URL="http://www.talk.electricianforum.co.uk/question-answer-board/16596-tnc-s-earth-external-building.html"]http://www.talk.electricianforum.co.uk/question-answer-board/16596-tnc-s-earth-external-building.html[/URL]) I don't understand how, if the supply neutral was lost, everything earthed in the house would become live, and how the exported earth would be at the same potential as the star point of the transformer. At one job I was at, the DNO came to move the intake, and installed a TT system, as opposed to a TN-C-S as we were expecting. When asked, the engineer said something about it being dangerous for them to install TN-C-S (I can't remember exactly what he said as it was over a year ago) What other pitfalls are associated with this system? [/QUOTE]
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