Nor myself or the IET Guidance Note suggest "a blanket 100 square meters".

I can not tell you how to design and install your systems, but as long as the IET continue to reference 100m2 in Guidance Note 1, I will provided due consideration of it.

Absolutely right. I still do it like this now. If there is a problem with one circuit you still have power on both floors so no extension leads up the stairs. It also uses considerably less cable.

Gary

I agree - the sockets per floor system works well with (old) traditional construction with a suspended timber ground floor. Where the ground floor is solid concrete and sockets are fed from the 1st floor void, then other layouts often make much more sense. Around here the split is often front/back- so the kitchen is paired with the low demand back bedroom (and bathroom).

   - Andy.

Yes mine is front, back & kitchen (traditional terraced house) and some more I`ve done, it depends on where the supply is, likely loading ( trying to balance it slightly) and floor types.

A sort of horses/courses type thing really - plus make it obvious near the consumer unit what does where. Most important part that is often missed

What evidence have you that there has been significant "overloading" in the past? By the design of an RFC this is very unlikely. Have you examples of melted cables, if so I would be interested to see.

David

I appreciate that its good practice to do this. The question is whether there is any publish guidance to suggest this "good practice", in particular BS7671, IET Guidance Notes, NICEIC, Napit etc.

Off Topic

The Question is:

I have surveyed a house and have observed a domestic ring circuit which is serves a floor area exceeding 100m2, including upstairs, downstairs and utility containing (washing machine and tumble dryer) (kitchen ring is separate). I am ok with this circuit contravening the 100m2 guidance, and not being respective to the load of the whitegoods, but I understand there is guidance on a domestic ring only covering a single level.

Can somebody point me towards this guidance either in published Guidance Notes or the Regulations (ie IET, NICEIC, NAPIT ect).

Thanks

Probably not - because I'm quite confident that in the IET guidance notes and the Regs, such unnecessarily  restrictive advice does not exist.

Less confident about NIC/NAPIT et al -  they say some odd things at times and they may have.

M.