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Multiple Earth Electrodes TT System

Steve UKBC
Thoughts or suggestions welcome....


Is there any issue or downside to having multiple earth electrodes installed on a single TT system (all areas have there CPC connected together) when the TT system spans a large area (we are taking about a 400m x 400m area)?


For example


If you had a couple of farm barns/sheds (metal framed) close together with multiple earth electrodes and some few hundred meters away you have a camp site with multiple earth electrodes (one at each power outlet etc) and then connect the CPC from the barns to the camp site to make one large TT system?



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    Generally more metal in the ground is a good thing, regardless of where, unless it is very near livestock, or the earthing of something else (HV transformer earths can bring in lighting induced surges, and electric fence earths, well the least said about what they can do,  the better really, just treat both sides of the HV pulser with equal respect for a quiet life.)


    If the TT earth is better than the one the DNO have on their transformer then funny things can happen during faults. ( read  this thread if you find it hard to sleep at night)


    If step voltages around a rod are a concern, then the top of the electrode should be insulated and or the ground surface made free draining (gravel perhaps or ungrouted paving).
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  • 0
    Generally more metal in the ground is a good thing, regardless of where, unless it is very near livestock, or the earthing of something else (HV transformer earths can bring in lighting induced surges, and electric fence earths, well the least said about what they can do,  the better really, just treat both sides of the HV pulser with equal respect for a quiet life.)


    If the TT earth is better than the one the DNO have on their transformer then funny things can happen during faults. ( read  this thread if you find it hard to sleep at night)


    If step voltages around a rod are a concern, then the top of the electrode should be insulated and or the ground surface made free draining (gravel perhaps or ungrouted paving).
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