Induction Hob again

Induction hobs are not any different as far as loading goes. I would point out to John that all multiple socket circuits do size the cable based on diversity (in that the total load is completely unknown, but often if all the sockets are fully loaded could be many times the breaker rating). In the case of fixed appliances, this is slightly less common but not prohibited. In the case of hobs and cookers there is a huge diversity effect from the thermostatic temperature control, and whilst in this case, it may be possible to trip a 40A breaker this would take a considerable period. Induction hobs take power in response to the size of the pan and the temperature set, so several 'rings' at full power for long is unlikely, as is the oven being on maximum for more than 5-10 minutes. I think that trips are pretty unlikely. I suppose a 10mm cable and 50A breaker is possible, but not worthwhile unless your cook is unusual in the methods (turn everything on at once with a full complement of large pans of cold water!). If you find the slight risk of the occasional trip using the above method, I suggest that one cable as described is adequate, unless your wall is stuffed with insulation. As you appear to have no cable route, fitting an extra cable is either via an outside route, or impossible so you will have to go with one anyway. It would take somewhere around an hour to trip with full load continuously, this would be extremely difficult to achieve with the appliances you have specified. I would have no difficulty with this arrangement, even in a commercial kitchen.

Induction hobs are not any different as far as loading goes. I would point out to John that all multiple socket circuits do size the cable based on diversity (in that the total load is completely unknown, but often if all the sockets are fully loaded could be many times the breaker rating). In the case of fixed appliances, this is slightly less common but not prohibited. In the case of hobs and cookers there is a huge diversity effect from the thermostatic temperature control, and whilst in this case, it may be possible to trip a 40A breaker this would take a considerable period. Induction hobs take power in response to the size of the pan and the temperature set, so several 'rings' at full power for long is unlikely, as is the oven being on maximum for more than 5-10 minutes. I think that trips are pretty unlikely. I suppose a 10mm cable and 50A breaker is possible, but not worthwhile unless your cook is unusual in the methods (turn everything on at once with a full complement of large pans of cold water!). If you find the slight risk of the occasional trip using the above method, I suggest that one cable as described is adequate, unless your wall is stuffed with insulation. As you appear to have no cable route, fitting an extra cable is either via an outside route, or impossible so you will have to go with one anyway. It would take somewhere around an hour to trip with full load continuously, this would be extremely difficult to achieve with the appliances you have specified. I would have no difficulty with this arrangement, even in a commercial kitchen.