Power Calculator Calculator for North Carolina
NEC 2017 power calculator math for EV charger installers working in North Carolina.
Converting between kW and amps is the entry point for nearly every North Carolina EV install spec — manufacturers publish kW, but the panel, breaker, and feeder live in amps.
Worked example for North Carolina
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. Duke Energy Carolinas typically meters DCFC sites at the 480 V three-phase service in North Carolina.
Code & Utilities
EV installations in North Carolina are governed by the 2017 National Electrical Code, in force since 2018. 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 North Carolina include Duke Energy Carolinas, Duke Energy Progress, Dominion Energy NC. Each has its own service-upgrade timeline, EV rebate availability, and metering rules — confirm them before quoting commercial work.
Climate & Ampacity
Plan EV feeders against a 92°F ambient in North Carolina — the resulting NEC 310.15(B) correction of 0.88× is what trims a #6 THWN-2 down to its true continuous rating. 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.
North Carolina 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.