EV Charger Installation

EVSE is a continuous load (625.41 / 625.42). Size branch-circuit conductors and the OCPD at 125% of the charger’s load current (also 210.19 and 215.2 / 210.20 as applicable). A 48 A charger requires a 60 A circuit (48 × 1.25 = 60). Many wall units are adjustable — if you set the unit down, size the circuit to the adjusted current the equipment is set and marked for, and follow 625.42 where a restricted adjustable setting is used.

• 625.54 (2020 and 2023): GFCI protection for personnel is required for receptacles installed for the connection of EV charging equipment. A cord-and-plug 14-50 in a garage or driveway is the usual example.
• A hard-wired EVSE is not a 625.54 receptacle. Still check 210.8 location rules (garage, outdoors, etc.) and, where adopted, 210.8(F) for outdoor outlets of dwellings — that section has been revised and its enforcement delayed in some jurisdictions. Follow the adopted edition, any state amendment or TIA, the EVSE listing, and the AHJ. Many listed hard-wired units include personnel protection in the equipment; that does not automatically satisfy every 210.8 trigger.
• The 2023 edition of 625.54 still addresses receptacles; do not assume a hard-wired unit is exempt from every other GFCI rule.

Where a listed energy management system (EVEMS) or a restricted adjustable setting is used, 625.42 allows the calculated load to be the controlled maximum rather than the nameplate maximum, subject to the rules in 625.42 and the energy management requirements (2023 ties this more clearly to 750.30). The 2023 edition also splits load management and restricted adjustable settings into 625.42(A) and (B). If the EMS fails, the system must not leave the premises wiring overloaded — use listed equipment and follow its instructions.

2023 625.40: an individual branch circuit is required for EV charging outlets rated over 16 A or 120 V, with an exception when the load is managed so more than one charger can share a circuit. Check the exact text for the adopted edition.

• 2023 NEC 220.57 (new): include EVSE at 7200 VA or the nameplate rating, whichever is larger. EVSE is also excluded from the 220.53 four-or-more-appliance 75% demand. The calculator above shows this 7200 VA floor.
• 2020 NEC: there is no 220.57. Add the EVSE as a specific continuous load at its nameplate (or the managed maximum if 625.42 applies). Do not bury it in the 220.53 appliance demand.
• If the service or feeder does not have room, options are a service upgrade, a managed charger, or a listed load-shed device. Run the dwelling load calculation before you promise a 60 A circuit on a 100 A service.

• Use equipment listed for the location (indoor / outdoor, wet, cold). Output cable length and interlocks are in the listing (625.17, 625.44).
• EV charging receptacles are typically 14-50 or similar; they require GFCI per 625.54 and a weatherproof enclosure where they are in a wet location (406.9). In-use covers outdoors.
• 625.43: EVSE rated more than 60 A or more than 150 V to ground needs a disconnecting means in a readily accessible location. If that disconnect is not within sight, 2023 requires a plaque giving its location.