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Do-It-Yourself (DIY) Question & Answer Forum
TN-C-S Pitfalls
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<blockquote data-quote="steptoe" data-source="post: 251552" data-attributes="member: 7"><p>APP87</p><p></p><p>the BIG issue I have with TNCS/PME is that for it to be proper PME is that IMHO it should be rodded as close to the point of entry to your property as possible, ie, at your entry point,</p><p></p><p>therefore there is virtually no possibility of the cable being damaged unless on your premises, then its your problem.</p><p></p><p>nothing stopping you driving your own rods in either, is there?</p><p></p><p><span style="font-size: 8px"><span style="color: #C0C0C0">---------- Post Auto-Merged at 20:48 ---------- Previous post was made at 20:44 ----------</span></span></p><p></p><p>the other issue with TNCS being exported is this,</p><p></p><p>if it is only TNCS and NOT proper PME, the point of EARTH reference may only be at star point, this could in actual fact be miles away from your point of export, therefore due to variations in ground resistance and VD your DNO earth could in fact be at a different potential from true earth, this can be measured, in much the same way you can verify your TNCS supply to be true PME or not.</p></blockquote><p></p>
[QUOTE="steptoe, post: 251552, member: 7"] APP87 the BIG issue I have with TNCS/PME is that for it to be proper PME is that IMHO it should be rodded as close to the point of entry to your property as possible, ie, at your entry point, therefore there is virtually no possibility of the cable being damaged unless on your premises, then its your problem. nothing stopping you driving your own rods in either, is there? [SIZE=8px][COLOR=#C0C0C0]---------- Post Auto-Merged at 20:48 ---------- Previous post was made at 20:44 ----------[/COLOR][/SIZE] the other issue with TNCS being exported is this, if it is only TNCS and NOT proper PME, the point of EARTH reference may only be at star point, this could in actual fact be miles away from your point of export, therefore due to variations in ground resistance and VD your DNO earth could in fact be at a different potential from true earth, this can be measured, in much the same way you can verify your TNCS supply to be true PME or not. [/QUOTE]
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