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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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    There were several overlaps in posting there, and I will go a bit further. Alcomax is right, we need simplicity. It sounds to me as if you need to get the 3 phase supply to the main house even if you need a trench which may not be as difficult as you assume. The options are to get the DNO to supply 3 phases to the house in place of the existing single phase (not ruinously expensive if you get someone with a digger to do the trenches) or to run this other cable which you say may be difficult but still only digging and careful threading under the tree roots. The new cable length needs to be considered too, and the new DNO supply may be easier than other options. I assume that the supply cable is underground, if overhead it is quite simple and cheap. You will find that most contractors will give you high prices for this kind of job, and probably suggest a lot of additional works are necessary to do the job at all. Most will run away from the two supplies problem I outlined earlier. I would expect the 10mm cable would run your new laundry fine, with satisfactory volt drop unless very long, in which case it is not the best place to put the laundry! The NICEIC is not the only contractor body, and not in any way any kind of requirement, so you can probably find a local electrician who may well be better and more reasonable to properly help you. Any questions may be asked here for solution from him or you.


    Regards

    David CEng etc.
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  • 0
    There were several overlaps in posting there, and I will go a bit further. Alcomax is right, we need simplicity. It sounds to me as if you need to get the 3 phase supply to the main house even if you need a trench which may not be as difficult as you assume. The options are to get the DNO to supply 3 phases to the house in place of the existing single phase (not ruinously expensive if you get someone with a digger to do the trenches) or to run this other cable which you say may be difficult but still only digging and careful threading under the tree roots. The new cable length needs to be considered too, and the new DNO supply may be easier than other options. I assume that the supply cable is underground, if overhead it is quite simple and cheap. You will find that most contractors will give you high prices for this kind of job, and probably suggest a lot of additional works are necessary to do the job at all. Most will run away from the two supplies problem I outlined earlier. I would expect the 10mm cable would run your new laundry fine, with satisfactory volt drop unless very long, in which case it is not the best place to put the laundry! The NICEIC is not the only contractor body, and not in any way any kind of requirement, so you can probably find a local electrician who may well be better and more reasonable to properly help you. Any questions may be asked here for solution from him or you.


    Regards

    David CEng etc.
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