What is the minimum branch circuit size for a Level II EVSE rated at 32 amperes?

To determine the minimum branch circuit size for a Level II Electric Vehicle Supply Equipment (EVSE) rated at 32 amperes, it is important to consider the National Electrical Code (NEC) guidelines. The NEC recommends that circuit breakers and conductors be sized based on the continuous load they will carry. According to NEC Article 625, the branch circuit for EV charging should have a capacity that is at least 125% of the continuous load.

In this case, the continuous load is 32 amperes. To calculate the minimum required branch circuit size, you multiply the continuous load by 1.25:

32 A x 1.25 = 40 A.

This result indicates that the circuit must be capable of handling at least 40 amperes. Therefore, a 40 A branch circuit adequately meets the requirement for supporting a Level II EVSE rated at 32 amperes, making it the appropriate choice.

While other options such as 30 A or 35 A are below the calculated minimum of 40 A, and a higher value like 50 A exceeds the requirement, the focus is on compliance with the minimum necessary sizing to ensure safety and functionality for electric vehicle charging.