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Exported earth
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<blockquote data-quote="davetheglitz" data-source="post: 4521" data-attributes="member: 173"><p>Hi Steptoe - I'm fairly new and limited to domestic experience to this so bear with me - but I can't see why you are against the mix of earth types - particularly with a TT-TN mix.</p><p></p><p>Considering an exported earth to a garage with water supplied via a metal pipe - you would definitely bond the pipe. How is that electrically different to connecting to an earth rod?</p><p></p><p>By adding an earth rod at the garage end surely you are giving a belt and braces earthing point for the RCD to act on in the event of a failure of one earth or the other.</p><p></p><p>My other point is how independant can earthing be anyway? Two terraced houses are not going to have completely independant earths - they will be joined outside of the properties boundaries - so why is a parallell earth path such a bad thing if both paths can handle the full pfc? The ultimate parallel earth path is the earth iself!</p><p></p><p>Could you elaborate please - it's obviously something you feel deeply about and I want to understand.</p><p></p><p>Cheers</p><p></p><p>Dave</p></blockquote><p></p>
[QUOTE="davetheglitz, post: 4521, member: 173"] Hi Steptoe - I'm fairly new and limited to domestic experience to this so bear with me - but I can't see why you are against the mix of earth types - particularly with a TT-TN mix. Considering an exported earth to a garage with water supplied via a metal pipe - you would definitely bond the pipe. How is that electrically different to connecting to an earth rod? By adding an earth rod at the garage end surely you are giving a belt and braces earthing point for the RCD to act on in the event of a failure of one earth or the other. My other point is how independant can earthing be anyway? Two terraced houses are not going to have completely independant earths - they will be joined outside of the properties boundaries - so why is a parallell earth path such a bad thing if both paths can handle the full pfc? The ultimate parallel earth path is the earth iself! Could you elaborate please - it's obviously something you feel deeply about and I want to understand. Cheers Dave [/QUOTE]
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