- Reaction score
- 6
My customer wants to have one ring main connected via a change over switch to a generator.
Earthing is TNCS
My idea was is move the ring main to a new consumer unit run a 6mm T&E to the change over switch from the 32 amp mcb in the main C/U where the ring main was. Then a 6mm T&E back from the change over switch to the new C/U.
I would install an earth rod which would be connected to the new C/U so the new C/U would have two earths one from the existing C/U and one from the earth rod.
The house is in a village with lots of overhead wires and I just thought what would happen if the neutral was brought down by a tractor then the return current that would normally go down the neutral of all of the houses after the break would be back fed through my customers C/U through the ring mains T&E and to ground via the earth rod. This could easily be a very high current which would surely melt the earth wires of the ring main.
Am I missing something ?
Earthing is TNCS
My idea was is move the ring main to a new consumer unit run a 6mm T&E to the change over switch from the 32 amp mcb in the main C/U where the ring main was. Then a 6mm T&E back from the change over switch to the new C/U.
I would install an earth rod which would be connected to the new C/U so the new C/U would have two earths one from the existing C/U and one from the earth rod.
The house is in a village with lots of overhead wires and I just thought what would happen if the neutral was brought down by a tractor then the return current that would normally go down the neutral of all of the houses after the break would be back fed through my customers C/U through the ring mains T&E and to ground via the earth rod. This could easily be a very high current which would surely melt the earth wires of the ring main.
Am I missing something ?