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 insi de an uninsulated stud wall, across 5m inside an uninsulated ceiling a nd down 1.5m behind uninsulated plasterboard.
Taking the IET OSG guidance on diversity for cooking appliances, the t otal supply requirements would be:
First 10A + 30% of remainder = 10 + ( ((32+23)-10) x 0.3) = 10 + 1 3.5 = 23.5A
If my understanding and calculations are correct a single 6mm2 going to a s ingle 45A DP switch (a rare white one!):
and dual appliance outlet plate:
should suffice. The cable would be adequately protected by a 32A MCB.
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 1 0mm2 with a 40A MCB? Running cable is easy at the moment as the ceilin g 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 th e 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? ;-)