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Exporting TN-C-S earth in TN-S

Former Community Member
Former Community Member
I know this sounds weird, but let me explain before.


I have two dwellings both connected to one substation. One classified TN-C-S (dwelling A) and the other TN-S (dwelling B).


I have to run a new line for providing electricity inside the new plant room that will be built inside the dwelling B. The new line will be taken from a DB installed inside the dwelling A.


The reason because I need to do in this way, it is because of in the dwelling B I have no in enough power and I'm not allowed to run a new line from the substation.


My question is: if I run a new cable form the dwelling A to dwelling B, should I also connect the earth system of the dwelling A to the plant room in the dwelling B? I have to suppose yes. Obviously, I have to keep separate the two earth system, have not I?
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  • Former Community Member
    0 Former Community Member
    A couple of questions to get your scenario straight in my head please.

    Are these actually dwellings?

    How large a plant room/supply are you talking about?

    What capacity are the two current supplies?

    Is this in the UK?

    Will there be a "brick wall" totally isolating the plant room and the TN-S "zone"?

    Will extraneous conductive parts pass from one earthing "zone" to the other?
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  • Former Community Member
    0 Former Community Member
    A couple of questions to get your scenario straight in my head please.

    Are these actually dwellings?

    How large a plant room/supply are you talking about?

    What capacity are the two current supplies?

    Is this in the UK?

    Will there be a "brick wall" totally isolating the plant room and the TN-S "zone"?

    Will extraneous conductive parts pass from one earthing "zone" to the other?
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