10-gauge vs 12-gauge outdoor extension cord for EV charging: 10-gauge is safer for longer runs

12-gauge is the minimum for Level 1 charging, but 10-gauge is safer for runs of 50 feet or more to minimize voltage drop. Standard indoor cords (16-gauge) aren’t built for continuous high current and risk overheating or fire. Outdoor rating with a weather-resistant jacket and tight, molded plug is non-negotiable.