Weekly digest #105: EV charging news

EV Charging Load Calculations Get Real

The 2023 NEC cycle tightened how we size EVSE circuits, and the 2026 draft pushes further on load management. Article 625 is now the default reference for anything charging a vehicle, including the portable Level 1 cord your customer swears "doesn't count." It counts.

NEC 625.41 treats EVSE as a continuous load. That means 125% of the nameplate on both conductor sizing and OCPD. A 48A charger lands on a 60A circuit with 6 AWG copper, not 8 AWG, no matter what the forum guys tell you. The inspector in your jurisdiction is reading the same code book.

Load calcs under 220.57 let you add EVSE to an existing dwelling service, but only if you actually run the numbers. A 100A panel with electric range, dryer, and HVAC rarely has room for 48A of continuous charging without an energy management system per 750.30.

EMS and Load Management Systems

Energy management systems (Article 750) are becoming the quiet hero of residential EV retrofits. Instead of a service upgrade, you drop in an EMS that throttles the charger when the dryer kicks on. The panel stays, the customer saves four grand, and the load calc pencils out.

NEC 750.30(C) lets the EMS set the maximum current for the controlled load. Document the EMS output on your load calc, not the nameplate. Inspectors want to see the manufacturer's listing confirming the control authority.

Field tip: Photograph the EMS listing label and the installed control wiring before you close up the panel. If the inspector questions the reduced load calc later, you have evidence the system was installed per listing.

GFCI and the Level 2 Question

This one still trips crews up. NEC 210.8(A) requires GFCI protection for 125V through 250V receptacles in garages, and 210.8(F) expanded outdoor outlet coverage. A hardwired EVSE is not a receptacle, so 210.8 does not apply to the EVSE itself when it is wired directly.

Plug-in EVSEs on a 14-50 or 6-50 receptacle in a garage or outdoors trigger 210.8. Many units nuisance-trip on upstream GFCI breakers because the EVSE has its own internal CCID20 ground fault detection per UL 2231. Stack the two and you get calls at 2 AM.

• Hardwire Level 2 installs whenever possible to sidestep the double-GFCI issue.
• If the customer insists on a receptacle, spec a GFCI breaker listed as compatible with EVSE loads.
• Verify the EVSE manufacturer's GFCI guidance. Some explicitly forbid upstream GFCI protection.
• Torque the 14-50 lugs to spec, 50A continuous pulls melt loose connections.

DC Fast Charging on Commercial Jobs

Level 3 work is moving from oddball to routine. A 180 kW dispenser pulls roughly 250A at 480V three phase, and the utility coordination alone can add six months to the schedule. Article 625 Part IV covers the supply equipment, but Article 230 governs the service, and that is where most projects stall.

Conductor ampacity under 625.42 still uses the 125% continuous rule, so that 250A load wants a 320A circuit minimum. Cable tray fills under 392.22 get tight fast when you run four dispensers off a single switchgear lineup. Plan the raceway before you order the gear.

Grounding electrode conductors at the service get sized per 250.66. For commercial DCFC sites, bond every metallic component back to the main grounding electrode system. Ground ring electrodes per 250.52(A)(4) are becoming standard spec on new sites, not an upgrade.

Disconnects, Labeling, and Inspections

NEC 625.43 requires a disconnecting means for EVSE rated over 60A or more than 150V to ground. On a 48A residential unit at 240V, the branch breaker can serve as the disconnect if it is within sight or lockable. On commercial DCFC, you need a proper disconnect switch at the dispenser.

Labeling trips up otherwise clean installs. 625.42(B) wants the maximum output current marked on the EVSE where adjustable. If you dip-switched a 48A unit down to 40A for a load-limited panel, the label has to reflect it. An unlabeled adjustable unit fails inspection every time.

Field tip: Keep a roll of write-on polyester labels in the truck. Mark the set current, install date, and your license number. Inspectors appreciate seeing the electrician take ownership of the adjustment.

What Is Changing in 2026

The 2026 NEC draft expands Article 625 coverage and adds clarity around bidirectional charging, which matters as V2H and V2G hardware hits the market. Expect new requirements for interactive EVSE that can export power, tying back to Article 705 for interconnection.

Also watch for tighter language on PV-coupled EV charging. When solar inverters feed an EVSE through a shared DC bus, the grounding and disconnect rules get complicated. Read 690.13 and 625.43 side by side before bidding a combined PV plus EV project.

1. Pull the 2023 NEC 625 and the 2026 draft, read them back to back.
2. Check your AHJ adoption schedule, most jurisdictions lag the cycle by 12 to 24 months.
3. Price EMS options on every service-limited residential job before quoting an upgrade.
4. Coordinate with the utility on commercial DCFC the day you get the RFP, not after.