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Saw thanks. Ok so 10mm2 is plenty even with insulation. Future proofed at least in case I end up having to use an all electric cooker.

How do I apply the diversity rule of thumb to an all electric cooker? Say I use all 4 hobs (e.g. 5kw so 5,000W/230V = 21.7A ) about 30% of the time (21.7A x 30% = 6.5A and the oven (e.g. 5kw for arguments sake, 5so 21.7A) again 30% of the time (6.5A), so 6.5A+ 6.5A = 13A. Well below the 36A...

I ran another calculator, max allowed for 10mm2 with 100mm+ insulation is 36A. So a 36A all electric cooker is max allowed for that 45A DP switch, so about 8 kW.

I ran another calculator, max allowed for 10mm2 with 100mm+ insulation is 36A. So a 36A all electric cooker is max allowed for that 45A DP switch, so about 8 kW.

What temperature is a standard 10mm2 twin/earth rated to? Can't be far off

Yes, I meant thinnest cable so 10mm2. What's the most powerful all electric cooker running hob and stove all at once?

It's Reference Method 101 = Above a plasterboard ceiling covered by thermal insulation EXCEEDING 100mm. I ran, in that calculator (https://www.elandcables.com/cable-calculator), every installation method available and the thickest cable needed for 11m, multicore cable, 1 x 2 core cable...

10mm2 is the largest cable that will fit into a 45A DP cooker switch

12m long, all within insulation, 10mm2, B45 RCBO, 45A DP switch. Electric calculation (see JPEG) says 10mm2 for 45A is fine

Not 200kg more 40kg. Mineral wool over a large area

The 10mm2 cable goes behind the cooker and vertically down from the 45A DP socket so should be fine

To be clear there are no wall sockets in the coat cupboard, but there are 2.5mm2 x 4 cables going vertically upward. So clearly the backbox should not be directly in front of these vertical cables. I can put the backbox at a height of 0.45m to 1.2m (these are current regs for sockets). What...

Should the backbox be the same height as wall sockets?

Yep exactly just thought of that. Thanks! It's the labour (I would have to take down about 6 x plasterboard and pull about 200kg insulation out to then pull the 10mm2 cable through) - about a day's very dirty work - I hated it and would rather avoid. So a 1 gang back box (47mm) and a 1 gang...

Ok what about (same reply to EFLImpudence) as putting a 60A junction box 1.2m high up on the shared kitchen wall inside the coat cupboard? Poking into the cupboard so fully accessible. Then I can get 1m 10mm2 extra to go from the 60A junction box to 1.2m high up on the wall where the 45A DP...

What about putting a 60a junction box about 1.2m high poking out of the other side of the partition wall to the 45A kitchen switch? So fully visible. The other partition wall is inside a coat cupboard so the junction box would be fully accessible (i.e not under floorboard). Then I can get 1m...

Is there such a thing as a shrink sleeve that I can wrap around the 6mm2 cable (with damaged sheath) ?

Which part of the cupboard maximises access, front left, at back, or front right?

Have looked. There is no 10mm2 wago junction box. Can I put the 45A DP switch inside a cupboard?

Yes that's what I meant. So to the 45A DP switch then to then cooker outlet.