All circuit wiring / feeders must comply with Art 625 of the 2017 NEC (and 2020 NEC).
Charging stations are considered continuous duty loads required branch circuits and feeders to be calculated at 125% of the maximum load.
The service size must be calculated using 100% as a “continuous load” (such as heating and air conditioning are calculated).
Vehicle charging stations cannot be included in the portion for general load utilizing percentage demand to establish service capacity required.
Everyone should have the service capacity calculated prior to installation of charging systems.