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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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    And just to add my 2P.......544.1.1 is for the bonding...........Which I think the OP is asking about - as he says, "to achieve equi potential bonding"


    Where an installation has more than 1 source of supply to which PME conditions apply, a main protective bonding conductor shall be selected acording to the largest PEN conductor of the supply. 


    The same would apply if a TNS and a TNCS supply were in the same building I believe ..........


    I've had this before and the a new gas and water supply ended up common to a much larger building and needed to be bonded for the larger PME supply between the smaller supply and the PME supply........ LOOOONG runs of 35mm earth in my case.


    There was an interesting article written in wiring matters I believe where the article addressed how long those bonding conductors could be.....
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  • 0
    And just to add my 2P.......544.1.1 is for the bonding...........Which I think the OP is asking about - as he says, "to achieve equi potential bonding"


    Where an installation has more than 1 source of supply to which PME conditions apply, a main protective bonding conductor shall be selected acording to the largest PEN conductor of the supply. 


    The same would apply if a TNS and a TNCS supply were in the same building I believe ..........


    I've had this before and the a new gas and water supply ended up common to a much larger building and needed to be bonded for the larger PME supply between the smaller supply and the PME supply........ LOOOONG runs of 35mm earth in my case.


    There was an interesting article written in wiring matters I believe where the article addressed how long those bonding conductors could be.....
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