4 Things to Know About Flat vs. Round Extension Cords
Flat cords are for low-wattage devices Use flat cords for lamps, phone chargers, and small fans. They are thin enough to run under rugs or along baseboards.
Round cords are for high-power tools and appliances Round cords handle higher amperage for power tools, space heaters, and refrigerators. They have better insulation and grounding.
Flat cords risk overheating with heavy loads Plugging a space heater or vacuum into a flat cord can cause overheating or fire. They cannot handle much current.
Never run round cords under rugs Round cords trap heat when covered, creating a fire hazard. If you are unsure which type to use, choose round for safety.