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Do-It-Yourself (DIY) Question & Answer Forum
Earthing conundrum
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<blockquote data-quote="Danny k" data-source="post: 480280" data-attributes="member: 31364"><p>Hi, I'm new to the forum so bear with , </p><p></p><p>I'm doing project with involves re wiring some lamp posts In a public park , the lamp posts are metal class 1 ( exposed conductive part ) supplied from tn-s. Earthing system . No probs I thought did cable calculation happy days . Then when on my 18th course I asked the tutor about this and they recommend I ditch the tn-s and rod it !! The explanation was that dno will no longer say if a supply has </p><p></p><p>a true separate earth . Seems counter productive to me to ditch a perfectly good earth for a rod and ze of up to 200ohms and relying on an Rcd , I've seen many rcd s fail . Any thoughts advise would be greatly appreciated </p><p></p><p>should I rod the posts as well (belt and braces) ?? </p></blockquote><p></p>
[QUOTE="Danny k, post: 480280, member: 31364"] Hi, I'm new to the forum so bear with , I'm doing project with involves re wiring some lamp posts In a public park , the lamp posts are metal class 1 ( exposed conductive part ) supplied from tn-s. Earthing system . No probs I thought did cable calculation happy days . Then when on my 18th course I asked the tutor about this and they recommend I ditch the tn-s and rod it !! The explanation was that dno will no longer say if a supply has a true separate earth . Seems counter productive to me to ditch a perfectly good earth for a rod and ze of up to 200ohms and relying on an Rcd , I've seen many rcd s fail . Any thoughts advise would be greatly appreciated should I rod the posts as well (belt and braces) ?? [/QUOTE]
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Earthing conundrum
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