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TN-C-S Pitfalls
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<blockquote data-quote="apprentice87" data-source="post: 251550" data-attributes="member: 13534"><p>Hi again Kelvfoozinda,</p><p></p><p>That is what the jointers told me, that they have many more problems with the modern stuff than they ever do with PILC.</p><p></p><p>Would you agree though with my little theory, that all this stuff about you cannot safely "export" earths outside of the equipotential zone [say to a shed in the garden or to exterior metalwork] with TNCS [but it is ok with TNS] [in case the DNO lose a neutral and all your earthed metal work becomes "live"] is a bit silly really, because even if they do lose the neutral the PILC sheath is in parallel with it anyway, and in the case that there is a break in the continuity of the sheath, THEN lose the neutral and your "nice safe" TNS earth is going to be live too!!, because, as you have explained, somewhere along the line, the sheath and neutral will be linked anyway, either at the point where the old PILC has been repaired with a section of wavecon, or where the service cable to a "PME" supply joins the main. So, effectively then, if i am on PME, then, in the event of a fault, so are the houses around me!!!</p><p></p><p>Just as well that the remnants of the old sheath will act as an earth rod....</p><p></p><p>What you think??</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 251550, member: 13534"] Hi again Kelvfoozinda, That is what the jointers told me, that they have many more problems with the modern stuff than they ever do with PILC. Would you agree though with my little theory, that all this stuff about you cannot safely "export" earths outside of the equipotential zone [say to a shed in the garden or to exterior metalwork] with TNCS [but it is ok with TNS] [in case the DNO lose a neutral and all your earthed metal work becomes "live"] is a bit silly really, because even if they do lose the neutral the PILC sheath is in parallel with it anyway, and in the case that there is a break in the continuity of the sheath, THEN lose the neutral and your "nice safe" TNS earth is going to be live too!!, because, as you have explained, somewhere along the line, the sheath and neutral will be linked anyway, either at the point where the old PILC has been repaired with a section of wavecon, or where the service cable to a "PME" supply joins the main. So, effectively then, if i am on PME, then, in the event of a fault, so are the houses around me!!! Just as well that the remnants of the old sheath will act as an earth rod.... What you think?? john.. [/QUOTE]
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