EV Charger Load Calculator for New York
NEC 2017 ev charger load math for EV charger installers working in New York.
Sizing an EV charger circuit in New York starts with NEC 2017 Article 625 — the EVSE branch must be sized to 125% of the continuous load. Hot-climate warm-band states like New York (88°F design ambient) also force a 0.88× ampacity correction at 75°C terminations.
Worked example for New York
For a 80 A Level 2 charger on a 240 V single-phase circuit, the OCPD is sized to 100 A (80 × 1.25 = 100.0 A, rounded up to the next standard breaker). The conductor must carry 100 A after New York's 0.88× correction — that typically lands at #6 AWG copper THWN-2 for a residential garage run, with conduit fill checked separately if you're stacking multiple home runs.
Code & Utilities
New York currently enforces the NEC 2017 edition, adopted in 2020. That includes Article 625 EVSE rules and the 125% continuous-load factor on charging branch circuits, though some 2020-cycle changes (like expanded EMS provisions) are not yet enforced statewide.
Major electric utilities serving New York include Con Edison, National Grid, PSEG Long Island, NYSEG, Central Hudson. Their make-ready, time-of-use, and demand-charge structures vary widely; pull the specific tariff before sizing service equipment.
Climate & Ampacity
New York's representative summer design ambient is around 88°F, which yields a 0.88× ampacity correction factor at 75°C terminations per NEC 310.15(B)(1). Because the correction is below 0.9, conductors that "look fine" on a 30°C ampacity table will not carry their nameplate current here — always derate explicitly.
New York takeaway
Always cross-check the EVSE manufacturer's listed maximum overcurrent rating; Con Edison may also have specific service-upgrade or load-management requirements you'll need to coordinate before final inspection.