5 Things to Know About Extension Cords for EV Charging

Use at least a 12-gauge cord for Level 1 charging Standard indoor cords (16-gauge or 14-gauge) overheat under the continuous 12-amp draw of an EV. 12-gauge is the minimum safe size.

Step up to 10-gauge for runs over 50 feet Longer cords increase voltage drop, which slows charging and heats the wire. 10-gauge minimizes this risk.

Only use cords marked for outdoor use Look for a “W” or “outdoor” rating on the jacket. Even in a garage, moisture and dust can cause failures with indoor cords.

Choose a cord with tight, molded plug ends Loose-fitting connectors can overheat over time. Molded plugs with a “heavy duty” or “EV use” rating are safer.

Never use a cheap cord to save money This is a fire and safety risk. Thicker wire and quality construction cost more, but they prevent dangerous failures.