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Outbuildings - multiple consumer units

Former Community Member over 3 years ago

Evening all,

In a situation where I'm shortly going to be rewiring a new house I'm moving into and am hoping someone can provide me with some clarity on the best way to provide power to multiple outbuildings.

Essentially I had planned to install a main consumer unit indoors and then feed the outbuilding via an RCBO on this consumer unit, i.e. consumer unit to, twin and earth, to junction box internal, to SWA across the garden, to secondary consumer unit in outbuilding - repeat this 2 or 3 times to the various outbuildings I need power in. However when doing a bit of research on the subject there seems to be differing opinions on whether to do this or to install a Henley block at the main incoming supply and then come out of that with one feed to my 'main consumer unit' and another feed out to the 'secondary outbuilding consumer unit' or multiple consumer units. It never occurred to me that this was an option and frankly I'm in a muddle as to what the consensus is on best practice, some mentioning a Switched fuse also.

If anyone could give me their opinion on what the safest and best practice is i'd be extremely grateful! TIA

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0 Former Community Member over 3 years ago

Thanks for your responses all, seems like I've got a good way forward with a slightly modified plan to the one in my last posts i.e. Henley block - Fused isolator (60a) - 16mm SWA - Split consumer unit (non RCD protected MCB feeding 2nd outbuilding consumer unit and RCD section with MCBs feeding 1st outbuilding circuits) - 10mm SWA - 2nd outbuilding split consumer unit (non RCD protected MCB feeding 3rd outbuilding consumer unit and RCD section with MCBs feeding 2nd outbuilding circuits) - 10mm SWA - 3rd outbuilding regular RCD protected consumer unit

All outbuilding consumer units being split boards with feed to next not on RCD and circuits from that unit covered on the RCD section.

Not entirely sure whether I'll do all the outbuildings as TT or not, possibly TT shared across the last two and its own dedicated TT for the primary. Each SWA's armour being bonded at the previous ground, i.e. 1st bonded with the house, 2nd bonded at the 1st, 3rd bonded at the 2nd.
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0 Former Community Member over 3 years ago

Thanks for your responses all, seems like I've got a good way forward with a slightly modified plan to the one in my last posts i.e. Henley block - Fused isolator (60a) - 16mm SWA - Split consumer unit (non RCD protected MCB feeding 2nd outbuilding consumer unit and RCD section with MCBs feeding 1st outbuilding circuits) - 10mm SWA - 2nd outbuilding split consumer unit (non RCD protected MCB feeding 3rd outbuilding consumer unit and RCD section with MCBs feeding 2nd outbuilding circuits) - 10mm SWA - 3rd outbuilding regular RCD protected consumer unit

All outbuilding consumer units being split boards with feed to next not on RCD and circuits from that unit covered on the RCD section.

Not entirely sure whether I'll do all the outbuildings as TT or not, possibly TT shared across the last two and its own dedicated TT for the primary. Each SWA's armour being bonded at the previous ground, i.e. 1st bonded with the house, 2nd bonded at the 1st, 3rd bonded at the 2nd.
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Outbuildings - multiple consumer units

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