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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?
Parents
  • Former Community Member
    0 Former Community Member
    A couple of questions to get your scenario straight in my head please.
    Are these actually dwellings? Yes Dwelling A is a restaurant e dwelling B is a big house
    How large a plant room/supply are you talking about? The Main supply for the plant room is around 100A three phase
    What capacity are the two current supplies? In the Dwelling A is 600A  in the dwelling B 100A
    Is this in the UK? Yes
    Will there be a "brick wall" totally isolating the plant room and the TN-S "zone"? The plant room is already existing and it has been built with bricks and it is located in the basement of the house
    Will extraneous conductive parts pass from one earthing "zone" to the other? unfortunately yes
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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? Yes Dwelling A is a restaurant e dwelling B is a big house
    How large a plant room/supply are you talking about? The Main supply for the plant room is around 100A three phase
    What capacity are the two current supplies? In the Dwelling A is 600A  in the dwelling B 100A
    Is this in the UK? Yes
    Will there be a "brick wall" totally isolating the plant room and the TN-S "zone"? The plant room is already existing and it has been built with bricks and it is located in the basement of the house
    Will extraneous conductive parts pass from one earthing "zone" to the other? unfortunately yes
Children
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