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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 reply Mike, there will be isolation from the meter able to isolate everything then secondary isolation for the long SWA run to outbuildings (in the form of a fused isolator) and possibly secondary isolation to the house CU.

Don't think its likely to be more than a few 10s of amps but would like to future proof as much as possible so seems sensible to segregate as the option is there. The main outbuilding has water but it comes from the house so will be earthed there, the first may well require a car charger at some point (maybe wise for me to consider putting a larger than 10mm SWA in to accommodate for the possibility of this future load?). Depending on the earthing arrangement in the house (either TN-S or TN-C-S) I will probably earth the main outbuilding from the house via third core of the SWA and then earth the following two with one new electrode TT system

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0 Former Community Member over 3 years ago

Thanks for your reply Mike, there will be isolation from the meter able to isolate everything then secondary isolation for the long SWA run to outbuildings (in the form of a fused isolator) and possibly secondary isolation to the house CU.

Don't think its likely to be more than a few 10s of amps but would like to future proof as much as possible so seems sensible to segregate as the option is there. The main outbuilding has water but it comes from the house so will be earthed there, the first may well require a car charger at some point (maybe wise for me to consider putting a larger than 10mm SWA in to accommodate for the possibility of this future load?). Depending on the earthing arrangement in the house (either TN-S or TN-C-S) I will probably earth the main outbuilding from the house via third core of the SWA and then earth the following two with one new electrode TT system

Sound sensible?
Cancel
Vote Up 0 Vote Down

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Outbuildings - multiple consumer units

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