By Alexandr Godonoaga, Licensed Illinois Electrician (License #26-00032356) — Cob Services LLC
A homeowner in north Naperville called us in March, frustrated. He’d hired a general handyman off a neighborhood Facebook group to install his Tesla Wall Connector, paid $400 cash, and the City of Naperville inspector had just red-tagged the job. The handyman wasn’t returning calls. The car was sitting in the garage with no way to charge.
We came out to fix it. The inspector’s punch list had four items on it. The actual problem, once we opened the wall, was closer to seven. The conductor was 8 AWG instead of 6 (undersized for the 60-amp breaker), there was no listed disconnect on a circuit over 60 amps, the EGC was the wrong gauge, the connector had been mounted at 22 inches off the floor (below the 24-inch minimum for the listed product), and the unit had been commissioned to 48A on a circuit that physically couldn’t support continuous 48A draw. None of it was salvageable. We had to pull the wire, swap the breaker, re-mount the unit, and re-commission it.
That kind of call isn’t rare around here. The City of Naperville’s building department has been tightening EV inspections since the 2024 fee schedule revision, and the things they’re flagging are the same things we see over and over. So this post walks through the five most common violations we’ve cleared in 2025 and 2026, with the actual NEC sections behind each one. If your install just got red-tagged, you’ll probably recognize at least one of them.
How EV charger inspections actually work in Naperville
Quick context first, because most homeowners I talk to think the inspection is one visit. It’s two.
The City of Naperville’s building department requires a permit for any residential EV charger install over 30 amps, which is basically every Level 2 install. The permit triggers a rough-in inspection (before the wall closes up, if conduit is being run) and a final inspection (after the unit is mounted and energized). For most retrofit installs in finished garages, the inspector does both in a single visit because nothing was opened.
The inspector checks the install against NEC Article 625, which is the section of the National Electrical Code that covers EV charging equipment. You can read it free on NFPA’s public access portal — pick NFPA 70 and navigate to Article 625. Worth knowing what’s in there if you’re about to argue with an inspector.
If the inspector finds a problem, you get a red tag and a punch list. You have 30 days to correct and schedule a re-inspection. If the original installer won’t come back (which happens more often than it should), the job is now yours to find someone to clean up, and the cleanup almost always costs more than doing it right the first time would have.
Here are the five we see most.
Violation one: undersized conductors for the breaker
This is the one we find on more red-tagged jobs than anything else.
NEC 625.41 requires the branch circuit ampacity to be at least 125% of the EVSE’s continuous load. For a Tesla Wall Connector running at 48A continuous, that’s 60 amps. The breaker has to be 60. The conductors have to be rated for 60A continuous in the ambient conditions they’re installed in.
In practice that means 6 AWG copper for most residential runs. Sometimes 4 AWG if the run is long enough that voltage drop pushes you up a size. Almost never 8, which is rated for 40A continuous and is what we keep finding on failed jobs.
The math we use, every time, on a 48A Wall Connector install:
- 48A × 1.25 = 60A minimum breaker
- 60A continuous requires 6 AWG copper at 75°C terminations (which is what residential panels are rated for)
- Add ambient derating if the conduit runs through an unconditioned attic in July
Why does this keep happening? Cost. 8 AWG copper is roughly half the price of 6 AWG. A handyman quoting $400 for the install is making margin on the wire size, and the homeowner has no idea until the red tag shows up. The cleanup, where we pull new conductor through existing conduit, runs $600 to $1,200 on top of the original $400 that’s already gone.
The deeper version of this problem (where the conductor was right but the conduit fill or run length wrong) is something we wrote up separately in our garage-to-driveway EV charger run breakdown for Plainfield homes. The principle is the same. Voltage drop math doesn’t care how cheap your installer was.
Violation two: no disconnect on circuits over 60 amps
NEC 625.43 requires a disconnect for EVSE rated more than 60 amps or more than 150V to ground. Most Level 2 residential installs are 240V single-phase at 48A on a 60A breaker, which sits right at the threshold. Read the section carefully — it’s “more than 60 amps,” not “60 amps or more.” A 60A breaker with a 48A unit does not technically require a separate disconnect under 625.43.
Where this trips people up is commercial and larger residential setups. If you’re running a 80A or 100A circuit for a faster DC charger or a larger commercial unit, you need a disconnect that’s lockable in the open position and within sight of the EVSE.
The inspector will also check that your panel breaker counts as a disconnect for the smaller installs — meaning it has to be readily accessible, not buried behind storage in a finished basement, and properly labeled. We’ve seen jobs red-tagged for missing labels, which is a five-minute fix that costs nobody anything except an extra trip from the inspector.
Tip: if your panel is in a finished basement closet, clear a three-foot working space in front of it before the inspector arrives. NEC 110.26 requires it, and Naperville inspectors enforce it.
Violation three: GFCI protection missing or wrong
NEC 625.54 requires GFCI protection for receptacle-based EV installs (the NEMA 14-50 outlet method) rated 150V to ground or less and 50A or less. Almost every plug-in Tesla Mobile Connector setup falls into this bucket.
Hardwired installs are different. The Wall Connector has built-in CCID20 ground fault detection that meets the personnel protection requirement of 625.22, so a hardwired unit does not need a separate GFCI breaker at the panel. In fact, putting a GFCI breaker upstream of a hardwired Wall Connector causes nuisance tripping because you end up with two ground fault systems fighting each other.
Where we see this go wrong:
A handyman installs a NEMA 14-50 outlet for a Tesla Mobile Connector, doesn’t put a GFCI breaker in the panel, and figures the connector itself has protection. Inspector red-tags it. Fix is a $90 GFCI breaker and a re-inspection.
Or, the inverse: a handyman installs a hardwired Wall Connector and puts a GFCI breaker on it because “more protection is better.” Customer calls us six weeks later complaining the breaker keeps tripping every time the car starts charging. We pull the GFCI, put in a standard breaker, problem goes away. The homeowner paid extra for the breaker that was actively making the install worse.
The choice between outlet and hardwired changes everything downstream, which is the whole reason we did the NEMA 14-50 outlet vs hardwired Wall Connector breakdown. The 2026 code update genuinely changed which one’s the default answer.
Violation four: connector mounted at the wrong height or location
NEC 625.50 covers where you’re allowed to put the unit. Indoors, it has to be installed in a “well-ventilated area” (which is most garages by default, but matters for utility closets). Outdoors, the coupling means has to be between 2 feet and 4 feet above the parking surface, and the unit has to be listed for wet locations if it’s exposed to weather.
The mounting violations we see:
- Wall Connector mounted at 22 inches off the floor (handyman thought “low to the ground” was better — code minimum for the coupling on outdoor installs is 24 inches)
- Unit mounted on the same wall as the gas meter (Naperville inspectors enforce a 3-foot clearance from gas regulators)
- Outdoor installation using an indoor-rated unit (the Universal Wall Connector is rated for outdoor use; some older Gen 3 units are not, depending on the part number — check the spec sheet)
- Connector cord stored on the ground (NEC 625.50 wants the cord stored at a height that keeps the handle protected from contamination)
That last one’s small but I’ve seen it cited. Mount the unit so the cord can dock properly, not coil on the garage floor.
Violation five: load calculation skipped or wrong
This is the most expensive one to fix, and it’s the one that requires the most arguing with the inspector when you do.
NEC Article 220 governs load calculations. Naperville’s building department requires a load calc submitted with the permit application for any new EVSE install. The calc has to demonstrate the existing service can handle the new continuous load on top of the existing demand.
Where this fails:
- Handyman never submitted the load calc with the permit. Some inspectors flag it at the office before the inspection ever happens; some catch it at the panel during the visit. Either way, you’re now doing the calc retroactively.
- The calc was done but didn’t account for an existing electric range, dryer, or AC unit. New EVSE load pushes the home over 100% of service rating. Inspector requires either a service upgrade (expensive) or a load management device like a DCC-9 or Wallbox’s Power Boost (much cheaper but adds time).
- The calc assumed 32A continuous when the unit is commissioned to 48A. We see this with handyman jobs where the installer “downrated” the calc to make the existing 100A service look like it had room, then commissioned the unit to full 48A so the homeowner wouldn’t notice. That’s not just a code violation. It’s an active fire risk in older Naperville homes with stressed panels.
If you have a 100A service panel and you’re putting in a Level 2 charger, you almost certainly need either a service upgrade or load management. The honest answer to whether your panel can handle the install is in our panel-handles-an-EV-charger self-assessment guide — and if the answer is no, no amount of creative load math will make the inspector approve it.
What to do if your install just got red-tagged
If you’re sitting on a red tag right now, here’s the order of operations.
First, get the punch list in writing from the inspector. Naperville’s building department will email it within a few business days. Don’t try to fix anything off memory.
Second, call the original installer and give them a chance to come back. They’re contractually responsible for the work passing inspection if you signed any kind of agreement. If they’re a licensed Illinois electrician, they have skin in the game with the state. If they’re a handyman with no license, the leverage is much weaker.
Third, if the original installer won’t come back, get a second opinion from a licensed electrician before assuming the whole job has to come out. Sometimes the punch list is fixable with a breaker swap and a single re-pull. Sometimes the entire install needs to start over. The difference between those two scenarios is a thousand dollars or more.
Fourth, schedule the re-inspection only after the work is genuinely complete. A second red tag costs you another permit fee and adds another 30-day clock.
We do red-tag cleanups
If you’re in Naperville, Aurora, Plainfield, Lisle, Bolingbrook, or Downers Grove and your EV charger install just failed inspection, we’ll come look at it and tell you honestly what it takes to get to a green sticker. No upsell. If the original work is mostly salvageable, we’ll tell you. If it has to come out entirely, we’ll tell you that too, with the actual numbers.
Request an EV charger service call → or call (630) 427-5923.
License #26-00032356. ComEd-eligible installer for the residential EV rebate program. Same crew on every job, same lead electrician from quote through final inspection sign-off.