"Extension cords are generally a safe solution for running power to electronics that are too far from the nearest wall outlet. But the operative word here is "electronics," which is not as all-encompassing as some people might think. Appliances (like refrigerators and toaster ovens) are obviously electronic devices, but they're in a different class from most electronics because of the amperage demands they need to function."
"Extension cords are manufactured with a maximum capacity to handle electrical current, which is determined by the size or gauge of the wire used in the cord. For instance, a 16-gauge extension cord can handle a maximum of 13 amps, while a 14-gauge cord can handle up to 15 amps (or 1,800 watts), the same as a standard wall outlet in the US."
Extension cords can safely power low-draw electronics but are limited by wire gauge and maximum amperage. Typical capacities include 16-gauge cords at 13 amps and 14-gauge cords at 15 amps (about 1,800 watts). Appliances with higher power demands can overload cords, causing overheating, melted insulation, exposed live wires, and potential fires. Any appliance requiring more than 1,800 watts should be on a dedicated circuit and not run through an extension cord. Heavy-duty kitchen and household appliances, and practices like daisy-chaining cords, increase fire risk and should be avoided.
Read at ZDNET
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