Each extension cord has specific ratings ... A 12-gauge cord is heavy duty, suited for use with power tools, and 10-gauge is extra heavy duty. Observing and matching the cord to the right task ...

Extension Cord Gauge What You Can Safely Plug In 12- to 10-gauge Space heaters, power tools, and other high-power-draw devices 16- to 14-gauge Lamps, chargers, and other low-power-draw devices ...