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Earthing conductor route

lyledunn
c7485ec9e68fd8899e2a119fdd12e5e4-huge-85dd7ef6-76b9-48a1-99c2-f89a6b8a6fa6.jpg

That’s a 25mm2 earthing conductor run some 20m along a border hedge to an electrode at the rear of the building. It is a permanent, recent installation. When I commented on it the contractor lost his cool and screamed “what the hell is wrong with it”? I thought that the answer was obvious but my written response on behalf of the client is to be framed within the context of 7671. I have no difficulty in digging up the relevant regulations but they are subjective in nature. Anyway, all good fun!
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    You say it goes to an earth rod? I wonder why its 25mm? It would be interested to measure the earth resistance of that installation. I assume it is TT?

    I don't think this is a professional job and so some DIYer has not quite got the idea of Earthing right. I cannot think why anyone would do that unless the building is on a big rock and the rod cannot be driven elsewhere, which is possible. I do see why the cable is not buried however, that is the rock! Would it be satisfactory if laced with a warning tape? I wonder if any of you have ever got a big digger with breaker and tried to bury cables across rock, it is not easy and very expensive! I don't think my hedge trimmer could cut a 25mm cable, it has trouble with some branches of 8mm or so.
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    You say it goes to an earth rod? I wonder why its 25mm? It would be interested to measure the earth resistance of that installation. I assume it is TT?

    I don't think this is a professional job and so some DIYer has not quite got the idea of Earthing right. I cannot think why anyone would do that unless the building is on a big rock and the rod cannot be driven elsewhere, which is possible. I do see why the cable is not buried however, that is the rock! Would it be satisfactory if laced with a warning tape? I wonder if any of you have ever got a big digger with breaker and tried to bury cables across rock, it is not easy and very expensive! I don't think my hedge trimmer could cut a 25mm cable, it has trouble with some branches of 8mm or so.
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