The design of our new kitchen for our open-plan extension is slowly maturing and, having decided what induction hob and double built-under oven we want, I would be grateful for opinions on what power supply(/ies) to run to them. The specs are:
Hob: AEG IKB64401FB, Total Loading 7350W (/230V = 32A) Oven: AEG DUB331110M, Total Loading 5300W (/230V = 23A)
The route from the CU to the hob+oven is pretty straightforward: Up 1m inside an uninsulated stud wall, across 5m inside an uninsulated ceiling and down 1.5m behind uninsulated plasterboard.
Taking the IET OSG guidance on diversity for cooking appliances, the total supply requirements would be:
First 10A + 30% of remainder = 10 + ( ((32+23)-10) x 0.3) = 10 + 13.5 = 23.5A
If my understanding and calculations are correct a single 6mm2 going to a single 45A DP switch (a rare white one!):
However, for future proofing (and better/safer? operation) should I put two 6mm2 cables in instead, each with there own 32A MCB? Or perhaps a single 10mm2 with a 40A MCB? Running cable is easy at the moment as the ceiling is down and I have open access to the rear of the CU (which, whilst a bit tight for wiring, does have some spare ways).
Note that this open-plan extension is being done under building control and so, with the hob+oven being a new circuit and therefore notifiable, I plan to get an electrician in to do the work (and, more importantly, give me the necessary certificate for sign-off) however I wanted to give some thought myself to what we should do in advance of asking them, whoever that might be... @Adam: You're not travelling through North Wiltshire anytime soon are you? ;-)