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Connecting Multiple Bemco/Ryefield Boards

GHEC
Ok I have a new build project where one Bemco/Ryefield board is not large enough to cover all apartments. 


I will need to install 3 to cover the number of outgoing ways required.


My questions is this. Given that there is one incoming bulk supply, what options are there to split it between the three? I know Lucy do an MSDB with a vertical busbar. Would the DNO accept daisy chaining these together? Or should we use a busbar chamber and tap-off to each board?


Any advice would be gratefully received.
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    The largest common Ryefield, I think, is something like 24 fuses (8 per phase) , if you need 3 of these, then that is 72 properties, is that about right ?


    If it is like that or bigger  you may well find it warrants an upgrade to the transformer or even its own new substation, or would round here, where we seem to have about 50-70 properties  per phase on a half MVA transformer as the largest arrangement in common use and not that that much slack. I do realize there are bigger things in cities, and it will depend where you are.

    Equally, there are plenty of set-ups with less, I've recently stuck my head in a cupboard where 21 flats and a common areas supply all shared a rather ropey 3 phase 100A header, in a Victorian building with no gas. Luckily the diversity to justify that  is not mine to worry about, and the incomer did not look particularly cooked, though the lights in the flats do seem to dim and bright a lot, presumably with neighbour's water heaters and so on.
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  • 0
    The largest common Ryefield, I think, is something like 24 fuses (8 per phase) , if you need 3 of these, then that is 72 properties, is that about right ?


    If it is like that or bigger  you may well find it warrants an upgrade to the transformer or even its own new substation, or would round here, where we seem to have about 50-70 properties  per phase on a half MVA transformer as the largest arrangement in common use and not that that much slack. I do realize there are bigger things in cities, and it will depend where you are.

    Equally, there are plenty of set-ups with less, I've recently stuck my head in a cupboard where 21 flats and a common areas supply all shared a rather ropey 3 phase 100A header, in a Victorian building with no gas. Luckily the diversity to justify that  is not mine to worry about, and the incomer did not look particularly cooked, though the lights in the flats do seem to dim and bright a lot, presumably with neighbour's water heaters and so on.
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