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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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    A while ago there was I think a wiring matters article about ring circuits that demonstrated the load from a typical kitchen appliances over some hours and how the 20A cable wasn't overloaded for long periods.

    I've identified the article - it was from the Spring 2002 (gulp!) Wiring Matters - which unfortunately I can't seem to find on-line at the moment Frowning2.


    I have copied the graphs though:

    94fa61d4bd4b8da08af9562c7772b67f-original-kitchenpowerusage.jpg


    The general gist of the article was that this was satisfactory even on a moderately unbalanced ring (so one leg may be carrying a fair bit more than 20A) as, even under the unlikely worst case of everything starting together, the duration of the overload was relatively short (well under an hour) - so was satisfactory from both a cable and overload protective device point of view.


    So basically diversity can give you a lot more than just adding up ratings plates or even measuring instantaneous currents might suggest.


       - Andy.
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  • 0
    A while ago there was I think a wiring matters article about ring circuits that demonstrated the load from a typical kitchen appliances over some hours and how the 20A cable wasn't overloaded for long periods.

    I've identified the article - it was from the Spring 2002 (gulp!) Wiring Matters - which unfortunately I can't seem to find on-line at the moment Frowning2.


    I have copied the graphs though:

    94fa61d4bd4b8da08af9562c7772b67f-original-kitchenpowerusage.jpg


    The general gist of the article was that this was satisfactory even on a moderately unbalanced ring (so one leg may be carrying a fair bit more than 20A) as, even under the unlikely worst case of everything starting together, the duration of the overload was relatively short (well under an hour) - so was satisfactory from both a cable and overload protective device point of view.


    So basically diversity can give you a lot more than just adding up ratings plates or even measuring instantaneous currents might suggest.


       - Andy.
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