5 Things to Know About Extension Cord Wattage Limits

1,560 watts is the absolute maximum At 13 amps and 120 volts, that is the fuse rating. It is not a safe continuous load.

Keep continuous use under 1,200 watts Voltage drop over 50 feet wastes power as heat. Cheap cords make this worse.

1,200 watts covers most tools and heaters A space heater on low, a circular saw, or a shop vac all stay safe. Pushing to 1,500 watts on a 50-foot cord risks overheating connectors.

Use a 12-gauge cord for 1,500-watt loads If you run a heater for hours, 12-gauge is mandatory. 14-gauge is fine for intermittent tools or lights.

Do not rely on the fuse to protect the cord The fuse prevents fires, not cord damage. It will not save you from melted connectors or annoying performance.