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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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    As others have said, in any one building you need a single 'off' point.


    you can use contactors to cut off one supply when the other is removed. It is not elegant, but it does acheive single point isolation, or you can co-locate switch gear - in effect two consumer units side by side, as you may find in a block of flats. You need to   be very careful about the earthing arrangements in such cases.

    As others have alluded there are ugly but safe solutions - cable running on the outside of the building and maybe overhead for example


    Long term I'd suggest to consolidate on the 3 phase if it can take the full load,and the metering for these various users can be separated..
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  • 0


    As others have said, in any one building you need a single 'off' point.


    you can use contactors to cut off one supply when the other is removed. It is not elegant, but it does acheive single point isolation, or you can co-locate switch gear - in effect two consumer units side by side, as you may find in a block of flats. You need to   be very careful about the earthing arrangements in such cases.

    As others have alluded there are ugly but safe solutions - cable running on the outside of the building and maybe overhead for example


    Long term I'd suggest to consolidate on the 3 phase if it can take the full load,and the metering for these various users can be separated..
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