Power Calculator Calculator for New Jersey
NEC 2020 power calculator math for EV charger installers working in New Jersey.
Converting between kW and amps is the entry point for nearly every New Jersey EV install spec — manufacturers publish kW, but the panel, breaker, and feeder live in amps.
Worked example for New Jersey
A 11.5 kW EVSE draws roughly 48 A at 240 V single-phase, or 14 A at 480 V three-phase. Apply the NEC 2020 125% continuous-load multiplier before sizing the OCPD or feeder. PSE&G typically meters DCFC sites at the 480 V three-phase service in New Jersey.
Code & Utilities
New Jersey currently enforces the NEC 2020 edition, adopted in 2021. That includes Article 625 (Electric Vehicle Power Transfer System) requirements: 125% continuous-load sizing on EVSE branch circuits, GFCI protection at outdoor receptacles, and provisions for energy management systems on shared circuits.
In New Jersey, you'll most often interconnect with PSE&G, Atlantic City Electric, JCP&L, Orange & Rockland. Always verify the applicable tariff and any utility-specific requirements (CT cabinets, metering enclosures, demand limiters) at design time.
Climate & Ampacity
New Jersey's representative summer design ambient is around 91°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 Jersey 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.