Re: Residential Electric Range
Do not confuse the demand load that applies to the service load calculation with the sizing of the branch circuit conductors and their overcurrent protection device. You have to size the branch circuit for the actual load. You don't get to use the tabulated demand factors here. The branch circuit has to be able to handle whatever current the load will draw. But from the viewpoint of the service load calculation, there is a good chance that the stove will not be at full power at the same time as the dishwasher, clothes washer, heater, and (biggest load of all) the hair dryers used by the women of the house.
But back to the branch circuit. First of all, does the manufacturer allow use of this range on a 208 volt system? Presuming that answer is "yes," is that rating of 9.5kW based on 240 volts? If so, the range will consume far less power at 208. The ratio of power is the square of the ratio of voltages, so at 208 volts it would draw about 7135 watts. That equates to about 34 amps at 208 volts. So a 40 amp breaker should be fine.
It's usually safe to go with the manufacturer's recommended sizes, unless you know something unusual about the particular installation.