Voltage Drop Calculator for Pennsylvania
NEC 2020 voltage drop math for EV charger installers working in Pennsylvania.
Pennsylvania 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 Pennsylvania
A 60 A Level 2 charger at 120 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. Pennsylvania's 0.88× ampacity correction is independent of voltage drop but applies on the same conductor pick.
Code & Utilities
Pennsylvania 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.
Pennsylvania's primary EV-relevant utilities are PECO, PPL Electric Utilities, Duquesne Light, FirstEnergy Pennsylvania. Their make-ready, time-of-use, and demand-charge structures vary widely; pull the specific tariff before sizing service equipment.
Climate & Ampacity
In Pennsylvania, the 89°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.
Pennsylvania 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 Pennsylvania will notice any drop above 5%.