Weekly digest #75: EV charging news

Load Calculations Are Where Most Installs Go Wrong

EV charging jobs live or die on the service calculation. A 48A Level 2 charger pulls 11.5 kW continuous, and continuous loads get the 125% multiplier under NEC 625.41 and 625.42. That means a 48A circuit needs a 60A breaker and conductors rated for 60A at the terminal temperature.

The bigger trap is panel capacity. Most 200A services in older homes were sized for a 10 kW range, a dryer, and maybe central AC. Add a 48A EVSE and you are often over the calculated load per Article 220. Run the standard method and the optional method from 220.82 before you promise the homeowner anything.

Energy Management Systems under NEC 625.42(A) let you stack EV loads on an existing service without an upgrade, provided the EMS prevents total load from exceeding the service rating. This is the fastest growing workaround on residential jobs in 2026.

GFCI and Disconnect Requirements Keep Changing

The 2023 NEC cycle pulled GFCI protection into EVSE installations under 625.54 for receptacles rated 150V to ground or less, 50A or less. If you are installing a 14-50 for a plug-in charger, that receptacle needs GFCI protection at the outlet or upstream. Hardwired units are not covered by 625.54, though 210.8(F) for outdoor outlets may still apply depending on location.

Disconnects trip up a lot of installs. NEC 625.43 requires a disconnect for EVSE rated over 60A or over 150V to ground, within sight of the equipment or lockable in the open position. A 48A unit on a 240V single phase circuit does not trigger 625.43 by itself, but many AHJs want one anyway for serviceability.

If the charger is more than 50 feet from the panel or around a corner, install a lockable disconnect even when code does not require it. You will thank yourself the first time you troubleshoot a unit in the rain.

Conductor Sizing and Voltage Drop on Long Runs

Garage-to-detached-structure runs are the most common voltage drop failure. NEC 210.19(A) Informational Note recommends 3% max on branch circuits, and EV charging is where this matters. A 48A load over 150 feet on #6 copper THHN drops close to 4%, which the charger will tolerate but the homeowner will notice in slower charge times.

For runs over 100 feet at 48A, bump to #4 copper or go aluminum #2. Check the termination temperature rating on both ends, because the 75C column in Table 310.16 is almost always the governing number on modern EVSEs and panels.

• Up to 50 ft at 48A: #6 copper, 75C terminations
• 50 to 100 ft: #6 copper still works, verify 3% drop
• 100 to 175 ft: #4 copper or #2 aluminum
• Over 175 ft: engineer the run, consider 120/240V step-up or feeder

Commercial and Multi-Family Installs: The Real Money

Residential EVSE is a one-day job. Commercial is where the work is heading in 2026, driven by fleet electrification and multi-family parking mandates in several states. Article 625 Part III covers DC fast charging, and the requirements scale fast.

Load management is non-negotiable on these jobs. A 20-stall Level 2 installation at 48A each would be 960A of continuous load if run simultaneously. Nobody designs that way. Networked load sharing per 625.42(A) lets you install 800A of chargers on a 400A feeder, with the management system throttling based on real time draw.

Grounding on DC fast chargers follows 625.101 through 625.106 and typically requires a dedicated equipment grounding conductor sized per 250.122, not just the raceway. Review the manufacturer instructions, because UL 2594 listed units often specify larger EGC than code minimum.

Permit and Inspection Pitfalls

AHJs are catching up on EV work, and the common red tags in 2026 are predictable. Missing working space per 110.26 around wall-mounted EVSE is the number one issue, especially in tight garage corners. You need 36 inches deep, 30 inches wide, and 6.5 feet high, measured from the equipment.

The second most common failure is improper bonding when the EVSE is installed on a detached garage with a subpanel. Separate structures under 250.32 require either a grounded conductor (old rule) or a dedicated EGC with no neutral-ground bond at the sub. Get this wrong and you create parallel neutral paths through the charger ground.

Photograph the panel schedule, the EVSE nameplate, and the disconnect before you close up. Three photos have saved more callbacks than any torque wrench I own.

What to Watch for in the 2026 NEC Cycle

The 2026 NEC is in final ballot review and several changes affect EV work. Proposed revisions to 625.42 expand EMS allowances to cover feeder-level management, not just service-level, which opens up panel-only upgrades without touching the meter. Article 625 Part IV on wireless power transfer is also getting clarified as inductive chargers hit residential market.

Bidirectional charging is the big one. Vehicle-to-home and vehicle-to-grid installations need to be treated as interconnected power production sources under Article 705, with all the disconnect, labeling, and AFCI implications that carries. If you are quoting bidirectional work, price in the extra labor for the interconnection agreement and the additional disconnects.

Stay ahead of your local adoption cycle. Some jurisdictions are still on 2020 NEC, others jumped straight to 2023, and California and a handful of others will move to 2026 within the year. Know what your inspector is enforcing before you wire the first conduit.