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Commercial TN-C-S earthing..???
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<blockquote data-quote="kme" data-source="post: 20273" data-attributes="member: 113"><p>Question:</p><p></p><p>A commercial property has an illuminated sign, located approx 15 metres from the building.</p><p></p><p>The supply is TN-C-S - BS88/ 3036 - SWA from main DB</p><p></p><p>The sign does not have an r1r2, or Zs reading.</p><p></p><p>At the only junction you can find (3" below the grass), the supply is 2 core rubber flex.</p><p></p><p>Between the sign and the building is a car park.</p><p></p><p>The cable feeds only the sign.</p><p></p><p>Do you:</p><p></p><p>1. drop a rod next to the sign, as the earth shouldn`t be exported anyway?</p><p></p><p>2. go hunting for the "hidden" joint with a digicat - if the car park has to be excavated, we`re into the thousands at least!</p><p></p><p>3. if you do 1. , what about the rubber cable in the earth(2 core, remember)?</p><p></p><p>FYI. The "junction box" consists of ametal pattress, wrapped with insulating tape, with a double connector strip inside it. 4" below the ground. (there is also an IP65 socket fed from the "JB" - 1.5mm rubber flex again.). The 3036 supply fuse is 16A - the outgoing swa is 10mm - the rubber flex at the "accessible junction" is 2.5mm MAX</p><p></p><p>Your thoughts, please?</p></blockquote><p></p>
[QUOTE="kme, post: 20273, member: 113"] Question: A commercial property has an illuminated sign, located approx 15 metres from the building. The supply is TN-C-S - BS88/ 3036 - SWA from main DB The sign does not have an r1r2, or Zs reading. At the only junction you can find (3" below the grass), the supply is 2 core rubber flex. Between the sign and the building is a car park. The cable feeds only the sign. Do you: 1. drop a rod next to the sign, as the earth shouldn`t be exported anyway? 2. go hunting for the "hidden" joint with a digicat - if the car park has to be excavated, we`re into the thousands at least! 3. if you do 1. , what about the rubber cable in the earth(2 core, remember)? FYI. The "junction box" consists of ametal pattress, wrapped with insulating tape, with a double connector strip inside it. 4" below the ground. (there is also an IP65 socket fed from the "JB" - 1.5mm rubber flex again.). The 3036 supply fuse is 16A - the outgoing swa is 10mm - the rubber flex at the "accessible junction" is 2.5mm MAX Your thoughts, please? [/QUOTE]
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