Power Calculator Calculator for Ohio
NEC 2017 power calculator math for EV charger installers working in Ohio.
Converting between kW and amps is the entry point for nearly every Ohio EV install spec — manufacturers publish kW, but the panel, breaker, and feeder live in amps.
Worked example for Ohio
A 50 kW EVSE draws roughly 208 A at 240 V single-phase, or 60 A at 480 V three-phase. Apply the NEC 2017 125% continuous-load multiplier before sizing the OCPD or feeder. AEP Ohio typically meters DCFC sites at the 480 V three-phase service in Ohio.
Code & Utilities
Ohio 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.
Ohio's primary EV-relevant utilities are AEP Ohio, Duke Energy Ohio, FirstEnergy, DP&L. Each has its own service-upgrade timeline, EV rebate availability, and metering rules — confirm them before quoting commercial work.
Climate & Ampacity
Ohio's representative summer design ambient is around 89°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.
Ohio takeaway
For three-phase math, always confirm the actual nameplate power factor — DCFC equipment is usually 0.95+ but older site-rated equipment can be lower, which changes the apparent power and the conductor pick.