A hardwired Level 2 charger is recommended over plug-in installation. The main reason is that many local electrical inspectors require the use of a Ground Fault Circuit Interrupting (GFCI) breaker when adding the 240-volt circuit needed for a NEMA 14-50 plug. However, most Level 2 chargers come equipped with an internal GFCI. Having two GFCIs on the same circuit can lead to nuisance tripping. This causes a major inconvenience for EV drivers because the GFCI must then be manually reset at the main electrical panel. Most drivers are not aware that the GFCI breaker has tripped until they are ready to leave their home in the morning, and then realize their EV has not charged at all during the night. (We have not seen this same nuisance tripping occur when installing a NEMA 14-50 plug to be used with the dual level charging cords that come standard with some EVs.)