The NEC does not directly address one important consideration: where to put the outlet. Have you ever pulled a rental car up to a gas pump, only to realize the filler cap is on the opposite side from where it is on your car? Correctly making the location decision requires knowing the location of the car’s charging port, how the car will be parked, and where the ventilation (if required) will be installed. With one exception, the maximum cord length is 25 ft [Sec. 625.17(C)].
The NEC does directly address knowing what the load is. Different electric vehicles can present wildly different loads. The charging system must be of sufficient rating to supply the load served [Sec. 625.42].
The charging circuit must be on its own branch circuit [Sec. 625.40]. Size the OCPD for the feeder and branch circuit for continuous duty. Size the branch circuit OCPD to at least 125% of the maximum load of the equipment. Size the feeder OCPD to at least the sum of the noncontinuous loads and 125% of the continuous loads [Sec. 625.41].