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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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  • Former Community Member
    0 Former Community Member
    gkenyon:

    I'd be thinking more about safe isolation and maintenance - even in domestic premises, the designer has to think about whether it's safe for maintenance, repair and decommissioning activities under CDM (that duty applies regardless of whether the project is notifiable, and regardless of it being domestic premises). It's not only fixed-wiring electricians that will work on electrical equipment in the Utility/Laundry room, but appliance engineers. They would likely never consider someone derived the supply for the machines from a second source of supply!


    Similarly, the users - if a machine starts smoking and they don't feel comfy unplugging, which "big red switch" do they turn things off at ?


    I planned to install a big Red 40A isolation rotary switch at the incoming point marked "Emergency Socket Power Switch Off" and that would provide isolation to the power supply for the sockets.


    They would also be protected by RCBO's (unsure if is an option if I want to share earth from the existing building and use power supply from outhouse) or an MBC + RCD.


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  • Former Community Member
    0 Former Community Member
    gkenyon:

    I'd be thinking more about safe isolation and maintenance - even in domestic premises, the designer has to think about whether it's safe for maintenance, repair and decommissioning activities under CDM (that duty applies regardless of whether the project is notifiable, and regardless of it being domestic premises). It's not only fixed-wiring electricians that will work on electrical equipment in the Utility/Laundry room, but appliance engineers. They would likely never consider someone derived the supply for the machines from a second source of supply!


    Similarly, the users - if a machine starts smoking and they don't feel comfy unplugging, which "big red switch" do they turn things off at ?


    I planned to install a big Red 40A isolation rotary switch at the incoming point marked "Emergency Socket Power Switch Off" and that would provide isolation to the power supply for the sockets.


    They would also be protected by RCBO's (unsure if is an option if I want to share earth from the existing building and use power supply from outhouse) or an MBC + RCD.


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