5 Things to Know About Extension Cords in Hot Weather

Heat reduces current capacity Higher temperatures increase copper wire resistance, meaning an extension cord can safely carry less current when it’s hot out.

Most cords are rated at 140°F Standard ratings assume 60°C ambient temperature. Direct summer sun can push ground temps near 120°F, derating the cord by 10-15 percent.

Avoid high-draw tools in summer heat Don’t run a space heater or miter saw on a long cord in July. If you must, use a thicker gauge cord.

Warm cord means trouble If the cord feels warm to the touch while powering a device, it’s too small or too long for the load.

Go up a gauge to be safe Heat plus load plus length is a triple threat. Always choose a thicker cord than you think you need in hot weather.