Heavy-duty extension cords are designed to handle higher electrical loads than standard extension cords. They typically feature thicker wires and robust insulation, making them suitable for powering heavy appliances, tools, and equipment. These cords are often rated for outdoor use, providing durability against weather conditions and wear. When selecting a heavy-duty extension cord, it's important to consider the gauge of the wire, which indicates its capacity to carry current. Common gauges for heavy-duty cords include 12-gauge and 10-gauge. Additionally, look for features like grounding and surge protection to ensure safety and reliability during use.