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Home / Code Guides / EV Charger Circuit

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.

RequirementModel Code StandardSection
Continuous loadEV 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
GFCIReceptacles installed for EV charging require GFCI protection under the 2023 NEC — including the common NEMA 14-50NEC 625.54
Hardwired equipmentChargers over 60A or over 150V to ground need a disconnecting means within sight of the equipmentNEC 625.43
Load calculationThe EVSE is added to the dwelling load calculation at 7,200 VA or the nameplate, whichever is larger — this is what determines whether the service can take itNEC 220.57
Load managementA listed energy management system may limit charger draw so an existing service qualifies without an upgradeNEC 625.42, 750
Location & cordsEquipment listed for the location (indoor/outdoor), with output cable lengths and interlocks per the listingNEC 625.17, 625.44

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.
Sections cite the 2021 International Residential Code and 2023 National Electrical Code as model standards. This is BuildSpec’s own summary — not ICC or NFPA text; read the authoritative language at codes.iccsafe.org. Your state may be on a different edition with amendments — check your jurisdiction page or get an Address Report.
Deck Footings →Deck Ledger →GFCI Protection →Egress Windows →Stairs →Handrails & Guards →