EV Charging ports in Garages

Has anyone dealt with EV chargers in a garage during any of their inspections yet? If so, is there a way to test it?

Do you mean just the wiring to the charger or the function of the actual system? I believe the wiring is just simple 240V, 3+1 wire so your standard electrical testers would work. As for the actual system, I disclaim them as beyond the scope of the inspection. Without having a vehicle to plug in (and wait while it charges) I’m not sure there’s much we could do.


Thank you. The wiring has been an option by builders for a year or so now, but the electric company is moving towards being installed in all new homes.

There’s a lot you can do visually. Ensure there’s a dedicated breaker, proper wire size, workmanship quality. The thing probably has an on light, and may have WiFi.
Usually these are 220V plus ground, with the neutral likely unused.

Many homes just have the NEMA outlet, not the actual charger, included with a home for sale. These are “EV Ready”.

EV chargers can draw 40A or more, and can be a capacity/amapacity/power budget issue for a home. Many CARS can’t draw the full amps, yet. Many chargers can be jumpered for less amps than their rating, in case the panel can’t handle the full rated load.

Sounds like a need for a Nachi Training Course / Quizz.


Great! Thank you for the info.

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I agree. It seems we are moving in that direction and some training would be beneficial.

You can also use a multimeter in the slots to make sure you are getting 240V. Same thing I do for dryers, if the dryer is not present.


Good idea, thanks!




I’m not allowed to ask questions here?


There’s a lot of ‘butthurt babies’ frequenting this place lately!


For you overly sensitive inspectors without a “Safe Space” to retreat to, trying to make it in a dog-eat-dog industry, grow a set! Regardless of your perceived gender!

This place is getting worse than fucking Facebook!

Hay dip shits, if you don’t like what I have to say, there is this thing here where you can ignore everything I post. Use it Dum Bass!

Hay NACHI, if you have anything to do with this censorship, block me. Kick my ass out. I don’t give a crap if I don’t waste my time teaching anyone here what you have yet to teach.

There are a lot of you out there that have sent me “Thanks for the help”. If you want me gone, don’t say anything. Fall in line like the Big Guy Joe wants you to in every part of your life. Otherwise, don’t put up with this crap.

If you think this is some sort of non-PC content, I can’t wait till you have to post here, “I need help, I’ve been served”.

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To try and pull this thread back on track I think there are two questions. First if the charger is a plug in (vs hardwired) you can obviously test the NEMA 14-50 with a DMM or a wiggy. But I don’t think you can test the functionality of an EV “Charger” without plugging it into something. I would be curious if they can be tested since they are growing in popularity here.

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Yeah, pretty hard to test with an actual EV.
But hey you’re a Home Inspector, a Tesla should be easily in your budget. And, a Tesla can do a full draw on a big charger.

See above: an EV charger that has proper blinking lights is doing self checks internally. Those things won’t even start delivering power without doing a whole host of checks.

The ClipperCreek CP-50 is indeed a tester and just $250/each. I can’t see anyone but an EV tech justifying carrying one.

CP-50’s primary functions include:

  • Verifying EVSE operations without a vehicle
  • Simulating vehicle connected and charge requested
  • Simulating CCID charging fault to ensure EVSE safety circuitry is functioning properly

Pair the CP-50 with a Digital Volt Meter to:

  • Measure incoming service voltage, each line to ground and line to line
  • Verify SAE-J1772™ connector proximity switch resistance is within specification range
  • Conduct advanced cable/connector troubleshooting

Pair the CP-50 with an Oscilloscope for:

  • Easy access test points to view SAE J1772™ pilot signal at various states (i.e. vehicle connected, charge requested)

I keep a wiggy in my vest pocket for this type of thing. It’s smaller and does the job. Just something for folks to consider.


Can’t imagine why David’s post was flagged. This whole discussion lacks any basic information about EV charging, without which you SHOULD NOT be attempting to test. There are several different approaches to EV charging and it should ALWAYS be deferred to a specialist. There is simply no way you could reliably determine if a EV charging system installation is adequate or functional.


I disagree. There are several standards for the plug at the end of an EV charger, but the important bits to safety and inspection are all basic volts, amps and quality of wiring.

So you’re really only testing the branch circuit not the actual charger itself.


The chargers self test themselves.
The components are:

  • Breker
  • Wire
  • Possible NEMA 14-40 outlet or whatever with possible weather cover
  • Charging controller wire, charger, wifi or display
  • Cord to the card and connector

Any of these could have physical damage. The charger will self test and refuse to start if there’s a grounding issue or electrical fault. The “charger” actually is just a switch – it does nothing but pass raw current to the car if the conditions are right. All the actual AC to DC and charging stuff happens in the car.

In that home inspector way, you can look at everything and call out nicks cuts physical damage and if the thing seems to have an operable display.

Download the https://www.plugshare.com/ app if you want to find an operable EV charger to compare and learn from.


In most cases, a Tesla will fully charge overnight. The speed at which your Tesla will charge at home will be dependent on your outlet. For the bulk of owners, installing an outlet outside or in your garage is the first step before taking delivery of your Tesla. When speaking with an electrician, let them know that Tesla recommends a NEMA 14-50. That’s a 240V outlet on a 50 AMP circuit breaker.

I didn’t see too many service panels that had an extra 50 A available in their service panels in the houses of potential Tesla buyers that I inspected.

More fun coming down the road for home inspectors…