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Do-It-Yourself (DIY) Question & Answer Forum
Shed earthing
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 92766" data-attributes="member: 250"><p>The big pivotal question that you have to ask is:-</p><p></p><p><span style="font-size: 14px"><strong>Has the out building got any extraneous conductive parts that need bonding?</strong></span></p><p></p><p>Because during a Neutral supply 'open circuit fault'..</p><p></p><p>this extraneous part will become the return path for the load of the whole of the main installation..</p><p></p><p>so your earth wire and metal pipe, (or whatever it is), will be carrying all the amps wot are coming up the Live conductor in the main building!</p><p></p><p>So the earth will need to be the same CSA, (Or bigger) as the neutral tails!</p><p></p><p>Reg 542.1.6 (ii) page 126.</p><p></p><p>The general rule of thumb is You do NOT export PME (TN-C-S) earth arrangements to another building/sub-installation.</p><p></p><p>but there are occasions where it IS permissible and still quite safe!</p><p></p><p>Personally I would have done the run in 2 core SWA, (save to cost of 3-core), and made TT at the remote end!</p><p></p><p> :|</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 92766, member: 250"] The big pivotal question that you have to ask is:- [SIZE=14px][B]Has the out building got any extraneous conductive parts that need bonding?[/B][/SIZE] Because during a Neutral supply 'open circuit fault'.. this extraneous part will become the return path for the load of the whole of the main installation.. so your earth wire and metal pipe, (or whatever it is), will be carrying all the amps wot are coming up the Live conductor in the main building! So the earth will need to be the same CSA, (Or bigger) as the neutral tails! Reg 542.1.6 (ii) page 126. The general rule of thumb is You do NOT export PME (TN-C-S) earth arrangements to another building/sub-installation. but there are occasions where it IS permissible and still quite safe! Personally I would have done the run in 2 core SWA, (save to cost of 3-core), and made TT at the remote end! :| [/QUOTE]
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