Power Calculator Calculator for Colorado
NEC 2023 power calculator math for EV charger installers working in Colorado.
Converting between kW and amps is the entry point for nearly every Colorado EV install spec — manufacturers publish kW, but the panel, breaker, and feeder live in amps.
Worked example for Colorado
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 2023 125% continuous-load multiplier before sizing the OCPD or feeder. Xcel Energy Colorado typically meters DCFC sites at the 480 V three-phase service in Colorado.
Code & Utilities
The applicable code in Colorado is the NEC 2023, which the state adopted in 2023. 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.
Colorado's primary EV-relevant utilities are Xcel Energy Colorado, Colorado Springs Utilities, Tri-State Generation. Each has its own service-upgrade timeline, EV rebate availability, and metering rules — confirm them before quoting commercial work.
Climate & Ampacity
In Colorado, the 90°F summer ambient drives a 0.88× 75°C ampacity correction. Bake this into every Level 2 and DCFC conductor pick before you commit to a wire size. 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.
Colorado 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.