Twin Oven and Induction Plate question

[neuromancery2k]

Hi Guys,

I'm currently studying for my C&G qualification and I was asked by my Dad about his new double oven and induction plate.
One of the Ovens is 2.2kW and the other is 2.8kW, also the induction plate is 440W. All appliances have 13A fused plug.

If I apply Diversity to the whole setup

I get 5440/230v = 23.65 amps

10a + (0.3 * 13.65) + 5 = 19.1 amps

Could you have two radial circuits of 2.5mm cable. One to run the 2.8kW oven and one to run the 2.2kW oven and the induction plate?

Would these then be attached to two 20A MCB's?

What sort of fused connection unit would you use?

Thanks for any insight you can give

 

[Eggster71]

In a word, No.
A 20 amp breaker is close to (in some cases over) the max capacity for 2.5. Personally I'd run 2 either 4mm or 6mm radials with one supplying a double socket to allow for the induction plate and lower rated oven. Obviously lengths of run and installation methods will affect things so always err on the side of caution!

 

[neuromancery2k]

Thank you for the reply.
So should the cooker control switch be 45amp rated?

 

[Eggster71]

So should the cooker control switch be 45amp rated?

Switch rating is dependant on the MCB rating, you'll have more room behind a 45A 2gang size isolator and 45mm back box though.

 

[neuromancery2k]

Thanks very much for the advice, so just to clarify....32amp MCB with 6mm T+E feeding a 45amp control switch with a 13amp socket

 

[Eggster71]

That should do it. Remember though, 2 supplys! You could also get away with one supply of 10mm on a 45Amcb though but that'll be a real cow to terminate into the sockets!

 

[neuromancery2k]

Fantastic!! two radial circuits it is
Thanks very much...now if only I could do this for my NVQ lvl3