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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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    In general multiple electrodes would be considered a good thing - as generally a lower overall Zs and likely more reliable too.


    The only flipside I can think of is that having one large TT system rather than several small ones is that the rise PE potential during a L-PE fault will affect a larger area. Normally that's not too much of a concern but could be significant, say if an RCD was faulty and so failed to disconnect at all.


       - Andy.
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  • 0
    In general multiple electrodes would be considered a good thing - as generally a lower overall Zs and likely more reliable too.


    The only flipside I can think of is that having one large TT system rather than several small ones is that the rise PE potential during a L-PE fault will affect a larger area. Normally that's not too much of a concern but could be significant, say if an RCD was faulty and so failed to disconnect at all.


       - Andy.
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