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Thanks for the helpful responses :) What about having half a kitchen, and the room directly above that half, on one circuit, and the other half of the kitchen, and the room directly above that half on another. Rooms above are bedrooms and have 4 socket outlets each. Talking purely socket...

Good stuff, in that case - thanks for your useful replies! 😃

Your reply doesn't have much detail. It is far from acceptable, or far from frowned upon?

Hi guys, Simple question, is it acceptable to put two separately fed socket circuits in the same room? Kitchen is 5M wide and wanted half on one circuit, opposite end on a different circuit. Would this be frowned upon? Thanks.

In a situation where the cables were to be run between a ceiling and floorboards of the next floor, where no insulation is present, would a de rating factor be applied?

I can't find reference to 433.1.204 anywhere in the regs? 433.1.103 states -"Ring final circuits protected by a 30 or 32A CPD are deemed to meet the requirements of Reg 433.1.1 If the CCC (Iz) of the cable is not less than 20A and if under the intended load conditions of use, the load current...

Yes - My Mistake! :oops: Sorry John , Where am i going back-to-front? Should i be trying to work out It at all? Or just using the values given in 4D5 and taking the suitability of the cable from there? So Iz = It*Ca*Ci*Cg*Cf Iz =21*1*0.78*1*1 (Assuming It = the value given in 4D5 for...

I've got lost here guys, can anyone put be back on the right track? I've now got; It - 32/(1*1*0.78*1) It - 41A So It > In - All Good? But then using table 4D1A And Reference Method B - It has to be 6/10mm cable - Obviously not right. Is there a rule for sizing cables in a RFC...

It is a mixture of circuits. 2 Ring finals, a Kitchen radial, 2 lighting circuits and a circuit for the boiler. So using Note 9 on 4C1 i could probably discount the two lighting cables as they are likely to less than 30% of the others? The grouping as i say is only to get them from downstairs...

Yes, then the insulation factor becomes minimum and the cables take different routes and are no longer 'grouped'.

My issue is that all circuit cables will be run through the cavity of a wall (insulated) and bunched together, untill they reach the void between upstairs and downstairs floor/ceiling. How would you categorize the insulation in a cavity wall? Am I right in taking this into account with...

It is Yes. What method would be used instead?

Sorry I don't follow?! :shock:

32A Ring circuit Ca - Ambient temp - 30c - 1 Cg - Cable grouping - (6 cables bunched in air or embedded in a surface) - 0.57 Ci - Thermal insulation factor (run in a length greater than 500mm) - 0.5 Cf - CPD type - Using a value of 1 - 1

Hi Again, I'm trying to work out the It of a ring final, and can't get a logical answer that I understand. It must greater than or equal to In/(Ca*Cg*Ci*Cf) 32/(1*0.57*0.5*1) = 112.2A ?! I've never designed a ring final before so my knowledge is poor, however I do know 25mm2...

Yes - I have done it before, and under scrutinisation, albeit a few years ago. Access to test equipment shouldn't be a problem either.

Thanks for the help! I'll do some thinking! I'd only be moving it a around a meter into a bigger section of the understairs area, but it would make access alot easier and as you say it would be simple enough to do with slightly longer tails.

So having a rewire at the same time I am 'Required' or 'Advised' to move it to a more accessible position? (I've not quite got my head around the Part M applying to new builds only, or rewires in older properties aswell.) By not more appreciable work to re-locate, Do you mean using longer...

I see - My plan is a rewire. I was unsure on whether i would have to have the CU re-located to another position which would be more accessible. Thanks for the replies!

:lol: Maybe very old wasn't a good description. Its is from the 1960's and the wiring is original. - Whether it is very old can be assumed from there :lol: