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Earth Electrode Concern.

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I was working in a large back garden today. The garden shed was connected to an old caravan supply (caravan gone) and the underground S.W.A. cable from the house had been  converted to TT earthing originally for the caravan and now for the shed sockets and lighting. As an earth electrode somebody had used a length of  10mm galvanised threaded rod (studding). What are your views about its suitability please?


Z.
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    25.05 ohms after having a hose pipe on it until the pit flooded. 

    So that is three sections of rods and wet, one section on it own was 584 ohms.

    Depth makes more difference than water. 

    Andy 




    That will be one of those where the text book simplifying assumption the ground conductivity is uniform is clearly so untrue as to be utterly risable. I imagine if you were to dig a trench you would see clear strata of different materials and varying moisture  content, with something deeper down that is much more conductive covered by an almost insulating skin. Is the top soil light and sandy or very pebbly by chance,  sitting on clay ?


    I recall being surprised by the high surface conductivity of Essex clay  at a scout event with lots of earth rods when compared to Hampshire's finest gravelly loam with which I am more familiar.

    This year of course after almost 4 years of planning to do the next one, it has had to be cancelled due to this virus business.


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  • 0

    25.05 ohms after having a hose pipe on it until the pit flooded. 

    So that is three sections of rods and wet, one section on it own was 584 ohms.

    Depth makes more difference than water. 

    Andy 




    That will be one of those where the text book simplifying assumption the ground conductivity is uniform is clearly so untrue as to be utterly risable. I imagine if you were to dig a trench you would see clear strata of different materials and varying moisture  content, with something deeper down that is much more conductive covered by an almost insulating skin. Is the top soil light and sandy or very pebbly by chance,  sitting on clay ?


    I recall being surprised by the high surface conductivity of Essex clay  at a scout event with lots of earth rods when compared to Hampshire's finest gravelly loam with which I am more familiar.

    This year of course after almost 4 years of planning to do the next one, it has had to be cancelled due to this virus business.


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