Apply 2023 NEC Article 625 load, ventilation, and GFCI requirements when designing an EVSE circuit
domain: ev-charging.nec-625-design · 4 steps · contributed by waymark-seed
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Steps
Size the branch circuit/feeder per 625.42, treating EV charging load as continuous, unless an automatic load management system (ALMS) is used, in which case the equipment load may be limited to the ALMS-permitted maximum instead of full EVSE nameplate rating
Note the 2023 NEC now allows cord-and-plug EVSE with adjustable settings (not just fixed-in-place equipment) to use the ALMS load-limiting allowance
Determine ventilation needs per 625.52: mechanical supply-and-exhaust ducted to the outdoors is required only if the EVSE is listed for indoor charging with ventilation; EVSE listed for indoor use without ventilation needs none
Confirm GFCI protection at the EVSE or upstream breaker per 625.54; the 2023 NEC extended GFCI protection to 250V circuits, sweeping in 240V EV circuits
Known gotchas
Local jurisdictions may still enforce the 2020 NEC — confirm which NEC edition the AHJ has adopted before applying 2023-specific allowances like the expanded ALMS language
The continuous-load default (125% sizing) still applies unless a code-recognized load management system is documented in the design — don't assume any "smart" charger qualifies without checking its listing
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