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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: 250719" data-attributes="member: 6969"><p>Oh yes you CAN as already explained in post #39</p><p></p><p>Yes I have been to one such fault. The customer complained of "no power" Well there was a tiny bit of power. If you turned on just one light, then it would glow very dim, but turn on anything else and nothing worked.</p><p></p><p>I quickly determined it was a broken neutral and the only reason anything worked at all was a high impedance return path via the water pipe bonding.</p><p></p><p>I told the customer there was nothing I could do and he needed to call Scottish Hydro. The feedback I got afterwards was that they had to dig up his driveway and half way across the road outside his house to lay in a new supply cable.</p><p></p><p><span style="font-size: 8px"><span style="color: #C0C0C0">---------- Post Auto-Merged at 08:39 ---------- Previous post was made at 08:29 ----------</span></span></p><p></p><p>That's the bit where you are wrong.</p><p></p><p>The Neutral and Earth are ONE and the same with a concentric cable. There IS NO EARTH CABLE SHEATH</p><p></p><p>So when the outer core of a concentric cable breaks, you lose your neutral AND your earth connection. That's what makes it so dangerous under a fault condition.</p></blockquote><p></p>
[QUOTE="ProDave, post: 250719, member: 6969"] Oh yes you CAN as already explained in post #39 Yes I have been to one such fault. The customer complained of "no power" Well there was a tiny bit of power. If you turned on just one light, then it would glow very dim, but turn on anything else and nothing worked. I quickly determined it was a broken neutral and the only reason anything worked at all was a high impedance return path via the water pipe bonding. I told the customer there was nothing I could do and he needed to call Scottish Hydro. The feedback I got afterwards was that they had to dig up his driveway and half way across the road outside his house to lay in a new supply cable. [SIZE=8px][COLOR=#C0C0C0]---------- Post Auto-Merged at 08:39 ---------- Previous post was made at 08:29 ----------[/COLOR][/SIZE] That's the bit where you are wrong. The Neutral and Earth are ONE and the same with a concentric cable. There IS NO EARTH CABLE SHEATH So when the outer core of a concentric cable breaks, you lose your neutral AND your earth connection. That's what makes it so dangerous under a fault condition. [/QUOTE]
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