Power Calculator Calculator for South Carolina
NEC 2017 power calculator math for EV charger installers working in South Carolina.
Converting between kW and amps is the entry point for nearly every South Carolina EV install spec — manufacturers publish kW, but the panel, breaker, and feeder live in amps.
Worked example for South 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 SC typically meters DCFC sites at the 480 V three-phase service in South Carolina.
Code & Utilities
The applicable code in South Carolina is the NEC 2017, which the state adopted in 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 South Carolina include Duke Energy Carolinas SC, Dominion Energy South Carolina, Santee Cooper. Their make-ready, time-of-use, and demand-charge structures vary widely; pull the specific tariff before sizing service equipment.
Climate & Ampacity
South Carolina's representative summer design ambient is around 94°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.
South 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.