National standards do not require ground fault circuit interrupter (GFCI) breakers for 50-ampere, 240-volt receptacles (local codes may be more stringent). All 15- or 20-ampere, 240-volt receptacles installed in garages or outdoors should be protected by GFCI breakers since they could be used for air compressors, power tools, or other cord and plug-connected equipment. EVSEs that comply with national codes and standards have internal ground fault protection and their supply cords are a maximum of 12 inches in length so you should have your EVSE available and determine the mounting location before installing a new receptacle for it. Follow branch circuit requirements noted in the EVSE installation instructions.
Some 30-ampere (or higher), 240-volt EVSEs which are intended for permanent mounting (whether plug-connected or hard-wired such as the AeroVironment unit I purchased in 2011) will trip standard GFCI breakers because they pass a small leakage current as a method to test the equipment ground connection. I had to replace a GFCI breaker with a standard 40-ampere breaker to use my AeroVironment EVSE. Any EVSE that is truly intended to be portable should be suitable for use with a receptacle that matches its plug protected by a GFCI breaker of appropriate current rating.
Last edited by GerryAZ
on Sat May 12, 2018 10:31 am, edited 1 time in total.
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019