I wired one phase to all the burners and the oven. They're on a separate circuit with a 16 amp fuse. It's 2200W. Has mever tripped. 400V is just not very common for residential in the EU, maybe in the UK you have electric boilers and other powerful appliances. I had a good laugh when I saw that your codes require an electrical connection between the two taps. Makes total sense from a safety perspective but it's still funny.