Cable and MCB size for oven and hob

Philip George · Dec 4, 2020

Good afternoon.
I'm fitting a new kitchen with a new hob and oven. I hope to use just 1 isolation switch for both appliances. Together the wattage size is almost 11kW.
Do I need 10mm cable with a 50A MCB?
Is that right?
Thanks.

telectrix · Dec 4, 2020

nope. you need a 6mm cable on a 32A breaker, 45A cooker switch, dual outlet to both appliances.

Philip George · Dec 4, 2020

Great, thanks, that's really helpful. How do you get to that if you don't mind me asking, is there a formula to use? It would be good to know.

sinewove · Dec 4, 2020

Philip George said:
Great, thanks, that's really helpful. How do you get to that if you don't mind me asking, is there a formula to use? It would be good to know.

11kw is 47.8A.Subtract the first 10A from this gives 37.8A.Work out 30% of 37.8A and add to the 10 A gives the loading of the oven and hob.
Regards,S

Dustydazzler · Dec 4, 2020

dint forget to check thr manufacturer instructions, some ask for a16amp supply

Philip George · Dec 4, 2020

sinewove said:
11kw is 47.8A.Subtract the first 10A from this gives 37.8A.Work out 30% of 37.8A and add to the 10 A gives the loading of the oven and hob.
Regards,S

I've had so many views on this, some saying the MCB should be 32A but also 40, 45 and 50A.

Midwest · Dec 4, 2020

Might be good to post the details of the appliances, just to be doubly sure. But as everyone has already said, typically 32A supply should suffice.

Philip George · Dec 4, 2020

Midwest said:
Might be good to post the details of the appliances, just to be doubly sure. But as everyone has already said, typically 32A supply should suffice.

Great thanks.
The appliances are a Neff N70 hob and Neff N70 oven.

Midwest · Dec 4, 2020

Philip George said:
Great thanks.
The appliances are a Neff N70 hob and Neff N70 oven.

Does the manufacturer specify anything, other than the norm 'consult a qualified electrician'?

From my quick googling, it would be ok, as long as the cooker control doesn't have a socket outlets. Its 9.3kW for the hob, 3.45kW for the oven?

Philip George · Dec 4, 2020

Midwest said:
Does the manufacturer specify anything, other than the norm 'consult a qualified electrician'?

It says consultant a qualified electrician. It also gives the wattage as 3.45kW for the oven and 7.4kW for the hob.

Midwest · Dec 4, 2020

Philip George said:
It says consultant a qualified electrician. It also gives the wattage as 3.45kW for the oven and 7.4kW for the hob.

Seems ok then. I got 9.3kW for the hob? Go for the dual outlet plate as already suggested.

If I recall, Neff don't supply final connection cables. So some suitable sized flexible cable should be sourced.

Philip George · Dec 4, 2020

Midwest said:
Seems ok then. I got 9.3kW for the hob? Go for the dual outlet plate as already suggested.

If I recall, Neff don't supply final connection cables. So some suitable sized flexible cable should be sourced.

Excellent, thanks