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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 think we have a problem that all this leads to multiple supplies from unknown sources in the same installation which is not permitted by the ESQCR regulations. You are also not permitted to have different Earthing systems, which could be the case with two supplies. The obvious solution is to feed the whole installation from the 3 phase supply (which is surely adequate), and ignore the second single phase supply. This should not need too much work, to rewire bits of the supply in building B. There is no objection to any routing of the submains or the construction of any of the buildings provided the IP rating of equipment is suitable for the environment. Main bonding may be required in building B depending on the external pipework etc. but the 3 phase supply should at least provide sufficient power from a single DNO supply. If you do not do this you will be in a maze of regulation from many sources and will need a long time to correctly document what you have done, assuming you can avoid the problems thereby raised.


    You need to be aware that using the Earthing system from a different supply is potentially dangerous, and probably never done in correctly designed installations, however you do have the option of TT assuming some way can be found to separate the Earth electrode from any supply earthing.
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    I think we have a problem that all this leads to multiple supplies from unknown sources in the same installation which is not permitted by the ESQCR regulations. You are also not permitted to have different Earthing systems, which could be the case with two supplies. The obvious solution is to feed the whole installation from the 3 phase supply (which is surely adequate), and ignore the second single phase supply. This should not need too much work, to rewire bits of the supply in building B. There is no objection to any routing of the submains or the construction of any of the buildings provided the IP rating of equipment is suitable for the environment. Main bonding may be required in building B depending on the external pipework etc. but the 3 phase supply should at least provide sufficient power from a single DNO supply. If you do not do this you will be in a maze of regulation from many sources and will need a long time to correctly document what you have done, assuming you can avoid the problems thereby raised.


    You need to be aware that using the Earthing system from a different supply is potentially dangerous, and probably never done in correctly designed installations, however you do have the option of TT assuming some way can be found to separate the Earth electrode from any supply earthing.
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