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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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    Is something I am doing here not allowed?

    I don't think it's completely prohibited, but you're certainly skating on very thin ice.

     
    Can I just get electricity supply from the outhouse to Building B and extend and use the earth of sockets already in Building B?

    In principle yes, but there are some very significant practical problems. How would isolation of building B work if an earth fault (or just standing earth leakage) could energise building B's earthing system from building A's supply? How would you satisfy the requirement for c.p.c.s within cable to be earthed in the same installation as the associated protective device, or where an overcurrent device is used for fault protection that the protective conductor be incorporated into the same wiring system as the live conductors or their immediate proximity?


    I'd advise a re-think. What's the current arrangement for supplying the dishwasher & washing machine? - there's likely to be a lot of diversity to be had there which might not be apparent. 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.


       - Andy.
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  • 0
    Is something I am doing here not allowed?

    I don't think it's completely prohibited, but you're certainly skating on very thin ice.

     
    Can I just get electricity supply from the outhouse to Building B and extend and use the earth of sockets already in Building B?

    In principle yes, but there are some very significant practical problems. How would isolation of building B work if an earth fault (or just standing earth leakage) could energise building B's earthing system from building A's supply? How would you satisfy the requirement for c.p.c.s within cable to be earthed in the same installation as the associated protective device, or where an overcurrent device is used for fault protection that the protective conductor be incorporated into the same wiring system as the live conductors or their immediate proximity?


    I'd advise a re-think. What's the current arrangement for supplying the dishwasher & washing machine? - there's likely to be a lot of diversity to be had there which might not be apparent. 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.


       - Andy.
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