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Connecting two earthing systems - PME on both - any implications of this?

Former Community Member
Former Community Member
Question out of theorotical interest, can you connect the earthing systems of two PME supplies to achieve equipotential bonding between the two electrical supoplies or devices they power?


What are the pro's and con's of this? I understand the implications of PEN faults which might make the earth have touch voltage but if there is equipotential bonding between two earth systems would the earth fault current (earth which now carries live voltage from neutral) not flow through to the earth of the other PME supply?


Appreciate your thoughts.
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  • Former Community Member
    0 Former Community Member
    You also need to be aware of the relative physical disposition of two or more PME supplies and their relative cable sizes - if one supply is a smaller cable, and sits in the "wrong" physical location relative to the other supply and source transformer, you can easily overload the PEN conductor on the smaller supply


    It's why DNO's are very wary of multiple PME services serving typical light industrial "sheds" all within the same structure, unless they all enter at the same physical position, rather than into each individual demise


    Regards


    OMS


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  • Former Community Member
    0 Former Community Member
    You also need to be aware of the relative physical disposition of two or more PME supplies and their relative cable sizes - if one supply is a smaller cable, and sits in the "wrong" physical location relative to the other supply and source transformer, you can easily overload the PEN conductor on the smaller supply


    It's why DNO's are very wary of multiple PME services serving typical light industrial "sheds" all within the same structure, unless they all enter at the same physical position, rather than into each individual demise


    Regards


    OMS


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