EV Charger Load Calculator for Indiana
NEC 2020 ev charger load math for EV charger installers working in Indiana.
Sizing an EV charger circuit in Indiana starts with NEC 2020 Article 625 — the EVSE branch must be sized to 125% of the continuous load. Hot-climate warm-band states like Indiana (90°F design ambient) also force a 0.88× ampacity correction at 75°C terminations.
Worked example for Indiana
For a 48 A Level 2 charger on a 240 V single-phase circuit, the OCPD is sized to 60 A (48 × 1.25 = 60.0 A, rounded up to the next standard breaker). The conductor must carry 60 A after Indiana's 0.88× correction — that typically lands at #6 AWG copper THWN-2 for a residential garage run, with conduit fill checked separately if you're stacking multiple home runs.
Code & Utilities
The applicable code in Indiana is the NEC 2020, which the state 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.
Major electric utilities serving Indiana include Duke Energy Indiana, AEP Indiana Michigan Power, NIPSCO, Indianapolis Power & Light. Each has its own service-upgrade timeline, EV rebate availability, and metering rules — confirm them before quoting commercial work.
Climate & Ampacity
Indiana's representative summer design ambient is around 90°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.
Indiana takeaway
Always cross-check the EVSE manufacturer's listed maximum overcurrent rating; Duke Energy Indiana may also have specific service-upgrade or load-management requirements you'll need to coordinate before final inspection.