EV Charger Electrical Code — Circuit Sizing, GFCI & Load Calculations
An EV charger is the largest continuous load most houses have ever seen, and the NEC treats it that way: everything is sized at 125%, receptacles get GFCI protection, and the service itself may need a load calculation before the permit is issued.
Worth knowing
- Most 48A-capable wall units can be dip-switched down to 40A or 32A — the cheapest fix when the panel has a 50A space but not a 60A one.
- The 14-50 receptacle route now costs a GFCI 2-pole breaker; hardwiring the charger avoids it and drops nuisance trips, which is why electricians increasingly hardwire.
- 6 AWG copper NM-B is only good for 55A — a 60A circuit in Romex needs 4 AWG, or run 6 AWG THHN in conduit. This catch generates a lot of failed inspections.
- Not every state is on the 2023 NEC — on the 2020 edition the GFCI receptacle rule is narrower. Check the state page for the adopted edition.
Common questions
What does the code say about continuous load for EV Charger Circuit?
EV supply equipment is a continuous load — branch circuit conductors and breakers sized at 125% of the equipment rating (48A charger → 60A circuit). (NEC 625.41, 210.19)
What does the code say about gFCI for EV Charger Circuit?
Receptacles installed for EV charging require GFCI protection under the 2023 NEC — including the common NEMA 14-50. (NEC 625.54)
What does the code say about hardwired equipment for EV Charger Circuit?
Chargers over 60A or over 150V to ground need a disconnecting means within sight of the equipment. (NEC 625.43)
Adopted edition by state
Base-code year from BuildSpec’s adoption records. States often amend the base code, and your city or county may differ, so confirm with your building department.