Do it right, or don't do it

🛑 STOP WATCHING YOUTUBE TUTORIALS

Listen, I appreciate that you want to save a buck. But I am tired of going into basements in Kansas City and seeing char marks on the drywall because you thought a "How-To" video from a guy in Florida applied to your 1970s panel in Missouri.

KCMO (Kansas City, Missouri) requires permits for EV chargers and panel additions not because they want your money (though they do), but because electricity doesn't care if you're a "handy guy."¹ It ONLY cares about math and physics. If you get the math wrong, the physics will burn your house down.

📝 THE BIG DIFFERENCE: PLUGGING IN VS. HARDWIRING

We need to be clear about what we are talking about here.

• Plugging In (Level 1): If you are taking the charger that came with your car and plugging it into a standard, pre-existing 120V garage outlet, you are generally safe. No permit needed. You're just using an appliance.
• Hardwiring/New Circuits (Level 2): If you are running NEW wire, installing a NEMA 14-50 outlet, or hardwiring a Tesla Wall Connector, you MUST pull a permit. You are altering the permanent wiring of the structure.

This is where homeowners mess up. You think, "I'm just adding an outlet." No, you are adding a continuous load that runs at maximum capacity for 8 hours straight. Your dryer doesn't even do that.

🗣️ WHY KCMO REQUIRES THE PERMIT: THE LOAD CALCULATION

This is the part DIYers ignore. KCMO requires a permit primarily to verify the Load Calculation.

Your electrical panel has a limit. Just because there are empty slots in the breaker box does NOT mean you have the electrical capacity to add more.

If you have a 100-amp service and you add a 50-amp EV charger, and then you turn on the AC and the oven... you are going to overheat your main bus bar.

The city inspector forces us to do the math (Total Load < Service Capacity) to prove your house won't go dark when you plug in your Rivian. If you skip the permit, you skip the math. If you skip the math, you risk a fire.

⚠️ BEWARE THE "LAZY ELECTRICIAN"

There is a gray area here that drives me crazy. You might hire a guy who says, "Ah, we don't need a permit for this, I'll just slap it in."

RUN.

That is a Lazy Electrician. He is skipping the permit because:

1. He knows your panel is already overloaded and he doesn't want to tell you that you need a Panel Upgrade (which is expensive).
2. He doesn't want to wait for the inspector.
3. He is using undersized wire (like NM-B "Romex" in conduit) that isn't rated for the heat an EV charger generates.

A professional pulls the permit to protect YOU. If your house burns down and the insurance investigator finds unpermitted electrical work, guess who isn't getting a payout?

🛑 THE BOTTOM LINE

In KCMO, the code is strict for a reason. EV charging is considered a "Continuous Load." That means we have to size the wire and the breaker at 125% of the amperage.

• You cannot just match the breaker to the charger.
• You MUST use a torque screwdriver to tighten the lugs to spec (loose wires start fires).²
• 
  
• You MUST have a disconnect if the charger is not within sight of the panel.

Do it right, or don't do it.