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Wooden Shed and how to proceed TT or not
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<blockquote data-quote="binky" data-source="post: 515125" data-attributes="member: 490"><p>I can't remember where the term was used either - probably guidance notes. </p><p></p><p>Judging by the diagram posted above, the NICEIC no longer supports this view either, and a quick look through the BBB offers nothing. </p><p></p><p>The argument for not exporting earths is long winded and based on worse case scenarios, which, to be frank, always seemed unlikely to happen in 99.99% of situations. Based on having TN-C-S, the concern was that a neutral fault with a neighbours system or somewhere outside of your property could mean your installation becoming the easiest route back to the nearest transformer with the potential to overload your neutral, and make your earthing live. The only case of this I've ever known about was in Truro shopping centre, where by the main gas pipe was still steel. The first anyone knew about the fault was gas appliances going 'mad'. The gas pipe was getting hot, heating the gas and increasing gas pressure. By the time Western Power got to the issue, the gas pipe was glowing red apparently (I only know of this becuase of a friend who worked for WP). Somewhere deep in this forum is a very long technical discussion about the potential issues. </p></blockquote><p></p>
[QUOTE="binky, post: 515125, member: 490"] I can't remember where the term was used either - probably guidance notes. Judging by the diagram posted above, the NICEIC no longer supports this view either, and a quick look through the BBB offers nothing. The argument for not exporting earths is long winded and based on worse case scenarios, which, to be frank, always seemed unlikely to happen in 99.99% of situations. Based on having TN-C-S, the concern was that a neutral fault with a neighbours system or somewhere outside of your property could mean your installation becoming the easiest route back to the nearest transformer with the potential to overload your neutral, and make your earthing live. The only case of this I've ever known about was in Truro shopping centre, where by the main gas pipe was still steel. The first anyone knew about the fault was gas appliances going 'mad'. The gas pipe was getting hot, heating the gas and increasing gas pressure. By the time Western Power got to the issue, the gas pipe was glowing red apparently (I only know of this becuase of a friend who worked for WP). Somewhere deep in this forum is a very long technical discussion about the potential issues. [/QUOTE]
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