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EARTH ELECTRODE A NOVEL METHOD

John Peckham
I am currently teaching a group of electricians from a company who are all South Africans or Zimbos to update to the 18th Edition.


We were working through the different types of earthing systems and I asked what did the use back home. The answer came TT. I asked what was the soil like and how deep and how many rods did they use. I will not try to mimic the accent or their terminology but words to the effect of, " We dig a big hole with a digger, lug a conductors on to a car or lorry engine and drop it in the hole with the digger and back fill".



Now I thought that was a brilliant idea given the surface area of a car engine dropped in to a deep hole. That would be ideal for an earth for my amateur radio transmitter assuming SWMBO would not object to a large hole in the front garden.


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    Talking of farmers, initiative is a pre-requisite. A local farmer had obtained a government grant for diversification of land so he set about developing a small caravan site. He did all the work himself including the electrical installation. However, do have the grant paid over he needed an NICEIC contractor to inspect and provide report. I was said contractor. TT installation with obvious earthing conductor going in to ground but no sign of rod or the like. Can’t remember actual loop impedance but well within Limits. Turned out he had buried a Vauxhall Viva and connected his earth to the chassis.
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    Talking of farmers, initiative is a pre-requisite. A local farmer had obtained a government grant for diversification of land so he set about developing a small caravan site. He did all the work himself including the electrical installation. However, do have the grant paid over he needed an NICEIC contractor to inspect and provide report. I was said contractor. TT installation with obvious earthing conductor going in to ground but no sign of rod or the like. Can’t remember actual loop impedance but well within Limits. Turned out he had buried a Vauxhall Viva and connected his earth to the chassis.
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