Can I Use A 13amp Fuse For Lamp How Do I Calculate What Size Fuse And Wire I Need.?

How do i calculate what size fuse and wire i need.? - can i use a 13amp fuse for lamp

I am my own kitchen, I assembled son and a 6.4kw stove and oven. 230V/400V, says the instructions in the. confusing, because I Underst that only 230 to a 13-amp fuse can be connected in order to promote integration, but what is the 400V /, is that for some other contry. Can you also explain how to calculate kw amps and volts with my stove as an example. thank you very much for any help.