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Earthing conundrum
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<blockquote data-quote="Danny k" data-source="post: 483056" data-attributes="member: 31364"><p>Hi mate, here goes,</p><p></p><p>600 deep as I think this is the common rule (I know it's not in the regs)</p><p></p><p>Ducting ( in case of additions / or rewiring) </p><p></p><p>Load is 12w per lamp</p><p></p><p>Distance 50metres run</p><p></p><p>Post evenly space</p><p></p><p>3core ( because this is a rewiring job, initial wiring failed as armour corroded, in cut out , ie lost earth continuity ) </p><p></p><p>6mm as biggest cable I can physically fit in post , all cable calculating done, voltage drop ect , obviously 6mm smashed it low load , shortish run</p><p></p><p>No rcd up stream </p><p></p><p>Rcbo ( additional protection) </p><p></p><p>Was planning to terminate in ip rated box in bottom of post ( as opposed to cut out ) to avoid them rusting again, termination very close to ground</p><p></p><p>Could isolate via double pole switch ( as I understand it this ok with regs)</p><p></p><p>Exposed/extraneous ? Good question, from definitions would say exposed, how good a contact they have with earth ? Some are actually on a stone plinth, and rest on ground , </p></blockquote><p></p>
[QUOTE="Danny k, post: 483056, member: 31364"] Hi mate, here goes, 600 deep as I think this is the common rule (I know it's not in the regs) Ducting ( in case of additions / or rewiring) Load is 12w per lamp Distance 50metres run Post evenly space 3core ( because this is a rewiring job, initial wiring failed as armour corroded, in cut out , ie lost earth continuity ) 6mm as biggest cable I can physically fit in post , all cable calculating done, voltage drop ect , obviously 6mm smashed it low load , shortish run No rcd up stream Rcbo ( additional protection) Was planning to terminate in ip rated box in bottom of post ( as opposed to cut out ) to avoid them rusting again, termination very close to ground Could isolate via double pole switch ( as I understand it this ok with regs) Exposed/extraneous ? Good question, from definitions would say exposed, how good a contact they have with earth ? Some are actually on a stone plinth, and rest on ground , [/QUOTE]
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