EV Charger Load Calculator for West Virginia
NEC 2020 ev charger load math for EV charger installers working in West Virginia.
Sizing an EV charger circuit in West Virginia starts with NEC 2020 Article 625 — the EVSE branch must be sized to 125% of the continuous load. Hot-climate warm-band states like West Virginia (88°F design ambient) also force a 0.88× ampacity correction at 75°C terminations.
Worked example for West Virginia
For a 40 A Level 2 charger on a 240 V single-phase circuit, the OCPD is sized to 50 A (40 × 1.25 = 50.0 A, rounded up to the next standard breaker). The conductor must carry 50 A after West Virginia's 0.88× correction — that typically lands at #8 AWG copper THWN-2 for a residential garage run, with conduit fill checked separately if you're stacking multiple home runs.
Code & Utilities
West Virginia currently enforces the NEC 2020 edition, adopted in 2022. 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.
West Virginia's primary EV-relevant utilities are Appalachian Power, Mon Power, Potomac Edison. 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 88°F ambient in West Virginia — 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.
West Virginia takeaway
Always cross-check the EVSE manufacturer's listed maximum overcurrent rating; Appalachian Power may also have specific service-upgrade or load-management requirements you'll need to coordinate before final inspection.