Onoff Posted March 16, 2023 Share Posted March 16, 2023 (edited) I'm trying here to improve my TT earthing arrangement. Soil isn't the best, this topsoil, heavy clay chalk. Every layer scattered with copious large flints. There was an old 3/8" dia 4' rod in. Replaced with a new 5/8" 4' rod and remade all the connections. Made naff all difference. I've now got 3 5/8", 4' rods in, spaced <1 rod's depth between each. I've tried coupling extra rods on in all 3 positions but I'm consistently hitting something 4" down so guessing that much be the chalk layer. Even tried an SDS adapter to hammer them in. The reading is better with 3 rods but it's messy! I have now a 600x600mm ex DNO copper earth plate here that I'm going to bury. Came from someone's farm where they had an 11kVA trannie on two poles and the DNO moved it/the poles leaving the plate in the ground with the wire cut off. Main question is should I bury it horizontal or vertical? Hopefully this weekend I'll get a hole dug and see exactly what I have ground wise. Edited March 16, 2023 by Onoff Link to comment Share on other sites More sharing options...
Gone West Posted March 16, 2023 Share Posted March 16, 2023 (edited) 1 hour ago, Onoff said: Main question is should I bury it horizontal or vertical? When I was doing my metal shed at the last place I found a website that showed all that sort of detail. Says it should be vertical. https://www.mepits.com/tutorial/497/electrical/electrical-earthing-grounding Edited March 16, 2023 by Gone West 1 Link to comment Share on other sites More sharing options...
Onoff Posted March 16, 2023 Author Share Posted March 16, 2023 (edited) 6 hours ago, Gone West said: When I was doing my metal shed at the last place I found a website that showed all that sort of detail. Says it should be vertical. https://www.mepits.com/tutorial/497/electrical/electrical-earthing-grounding Thanks. This too refers to the plate being set vertical but at a lesser depth than your link suggests. https://www.electrical-installation.org/enwiki/Installation_and_measurements_of_earth_electrodes Edited March 16, 2023 by Onoff Link to comment Share on other sites More sharing options...
Onoff Posted March 16, 2023 Author Share Posted March 16, 2023 (edited) Just to add, with 3 short rods slung in (and I do mean slung in, I was going to tidy it up but will just remove them if I go with the plate) I'm seeing 13.3 ohms earth loop impedance and 17A pfc (L - PE) to earth. Short video: Edited March 16, 2023 by Onoff Link to comment Share on other sites More sharing options...
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