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Extend new circuit from outhouse into another property with an existing supply, which is bad idea or not allowed?

Former Community Member
Former Community Member
So there is a wooden outhouse with a consumer unit of its own with RCBOs in it that gets it supply from Building A using a 10mm SWA. Building A has a 3 phase 100A power supply. 


Building B needs a new socket for some domestic appliances but has no sockets that can handle the demand in the room where it is required (dishwasher and washing machine).


Due to layout of land and location of consumer unit location for Build B (which has its own single phase existing electricity supply)  it is easier to run a SWA from the consumer unit of the wooden outhouse into Building A. So Building B is using electricity supply of Building A through the consumer unit of wooden outhouse. 


I know there are some concerns about earth bonding potential differences but what options do I have? Can I just get electricity supply from the outhouse to Building B and extend and use the earth of sockets already in Building B? 


Is something I am doing here not allowed?
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    It seems like the earth continuity test passed and the earth of both the power supplies (outhouse and building) is bonded with the gas and water pipes of the main house. So the electrician inffered that the earthing systems of both buildings are connected? It is possible that the two PME earth systems are supplied by the same cable laid on the street and possible served by the same rods (or the earth is connected at the substation which is less than 50m from thouse). In light of this would it be safe to run a new circuit from the outhouse to the main house?

    I don't see that that helps much. The continuity might be just down to the bonding of a metallic water or gas pipe - which might be replaced by plastic or have an insulating insert installed next week, or if the DNO's supplies do happen to to have a common N/PEN today, they might not next month or next year when the DNO upgrade the substation or tweak the layout of the distribution cables or re-configure a link box. Nobody will be able to make you any guarantees on that score - so you won't be able to take any precautions against the removal of such a link (to generalize one of the regs requirements). I think you'd still have to treat them as two separate supplies.


        -  Andy.
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  • 0
    It seems like the earth continuity test passed and the earth of both the power supplies (outhouse and building) is bonded with the gas and water pipes of the main house. So the electrician inffered that the earthing systems of both buildings are connected? It is possible that the two PME earth systems are supplied by the same cable laid on the street and possible served by the same rods (or the earth is connected at the substation which is less than 50m from thouse). In light of this would it be safe to run a new circuit from the outhouse to the main house?

    I don't see that that helps much. The continuity might be just down to the bonding of a metallic water or gas pipe - which might be replaced by plastic or have an insulating insert installed next week, or if the DNO's supplies do happen to to have a common N/PEN today, they might not next month or next year when the DNO upgrade the substation or tweak the layout of the distribution cables or re-configure a link box. Nobody will be able to make you any guarantees on that score - so you won't be able to take any precautions against the removal of such a link (to generalize one of the regs requirements). I think you'd still have to treat them as two separate supplies.


        -  Andy.
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