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Ground Resistance

ebee
It used to be fag packet type approximation that when measuring the earth impedance that as a very very much rule of thumb starter for ten sort of thing.

approx 80% of the total figure between two fart away points might be made up of the area around the local rod/plate/tapes etc and the other 20% between that area and all the area between them up to the area surrounding the other earthing point.

What would be a sort of max in ohms between two extremely far points example two countries ? say England and New Zealand or Oz?
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    I'd guess the opposite - on that the basis that the c.s.a. of the planet is very large even if it has poor conductance per unit volume it's still going to have a very low resistance overall. So even without any extra cables, I would have thought it was hardly any more than the normally measured resistances of the two electrodes added together.


    Add in that much of the Earth's rocks are rich in iron and salt water is reasonably conductive.


       - Andy.
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    I'd guess the opposite - on that the basis that the c.s.a. of the planet is very large even if it has poor conductance per unit volume it's still going to have a very low resistance overall. So even without any extra cables, I would have thought it was hardly any more than the normally measured resistances of the two electrodes added together.


    Add in that much of the Earth's rocks are rich in iron and salt water is reasonably conductive.


       - Andy.
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