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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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    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.

    Thank you.  My collection of pdfs goes back only to 2005.  They did nicer graphics in the old days. 

    It looks reasonable for its time. The drive for energy efficiency since 2002 has probably made a difference for the newer models. My dishwasher, for example, claims the 'standard' program to use a total of 11 L and 0.9 kWh for the entire 3h wash, and my preferred hardest-possible program is 19 L and 1.5 kWh. The washing machine claims around 0.5 kWh per wash on the standard (30 degC) setting that we normally use. Both of these are below half of what the charts claim, probably mainly because they now take so little water and avoid heating except for a few parts in the cycle (though perhaps comparing 30 and 60 degC washes is unfair).  The consumption became less than half as much when changing the 2004 washing machine in 2019. 

    So - even shorter durations of the high power would be expected in a modern machine. 


    The recent point about different addresses does add to the idea that it would be good to avoid mixing electrical supplies or making one 'address' depend on the other, e.g. if a property might be sold separately.  Is there good evidence from measurements to show that these few new loads would be too much if put on a separate circuit from the building's own supply?  Does the DNO refuse to increase the 60A?
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    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.

    Thank you.  My collection of pdfs goes back only to 2005.  They did nicer graphics in the old days. 

    It looks reasonable for its time. The drive for energy efficiency since 2002 has probably made a difference for the newer models. My dishwasher, for example, claims the 'standard' program to use a total of 11 L and 0.9 kWh for the entire 3h wash, and my preferred hardest-possible program is 19 L and 1.5 kWh. The washing machine claims around 0.5 kWh per wash on the standard (30 degC) setting that we normally use. Both of these are below half of what the charts claim, probably mainly because they now take so little water and avoid heating except for a few parts in the cycle (though perhaps comparing 30 and 60 degC washes is unfair).  The consumption became less than half as much when changing the 2004 washing machine in 2019. 

    So - even shorter durations of the high power would be expected in a modern machine. 


    The recent point about different addresses does add to the idea that it would be good to avoid mixing electrical supplies or making one 'address' depend on the other, e.g. if a property might be sold separately.  Is there good evidence from measurements to show that these few new loads would be too much if put on a separate circuit from the building's own supply?  Does the DNO refuse to increase the 60A?
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