4 Things to Know About Heavy Duty Extension Cords

Use 12-gauge or lower wire for anything beyond a desk lamp Lower gauge numbers mean thicker wire, which handles more current with less resistance and heat. Light duty 16- or 18-gauge cords are fine for phone chargers and lamps, but not for power tools, space heaters, or window A/C units.

Thick, cold-weather insulation is essential Heavy duty cords have rubber or vinyl that stays flexible in cold weather and resists cracking. Light duty cords become stiff and brittle, which can expose live wires and create fire or shock risks.

Never use a light duty cord for high-draw devices If you can feel the power draw—like with a saw, heater, or compressor—the cord will overheat, melt, or start a fire long before the breaker trips.

Do not skimp on cost here Saving a few dollars on a cord that powers real equipment is a dangerous mistake. Buy the right gauge and insulation for the job.