Voltage Drop Calculator for Kansas
NEC 2020 voltage drop math for EV charger installers working in Kansas.
Kansas EV installs frequently push past 100 ft of conductor — detached garages, parking-lot DCFC pedestals, and multifamily carport runs all add distance. NEC 2020 recommends a 3% branch / 5% total voltage-drop ceiling.
Worked example for Kansas
A 40 A Level 2 charger at 180 ft on 240 V single-phase #6 Cu shows roughly 2.9% drop. That's below the 3% NEC recommendation, so you'd stay at #6. Kansas's 0.82× ampacity correction is independent of voltage drop but applies on the same conductor pick.
Code & Utilities
The applicable code in Kansas 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.
In Kansas, you'll most often interconnect with Evergy, Kansas Electric Power Cooperative, Westar Energy. Always verify the applicable tariff and any utility-specific requirements (CT cabinets, metering enclosures, demand limiters) at design time.
Climate & Ampacity
Kansas's representative summer design ambient is around 99°F, which yields a 0.82× 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.
Kansas takeaway
Voltage drop is a recommendation, not a hard NEC rule — but EVSEs throttle aggressively below ~228 V on a 240 V circuit, so customers in Kansas will notice any drop above 5%.