"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 are appropriate for low-amperage electronics but are not suitable for high-draw household appliances. Cord capacity depends on wire gauge, with 16-gauge handling up to 13 amps and 14-gauge handling up to 15 amps (1,800 watts). Appliances that demand more power than a cord can supply can overload and overheat the cord, risking melting insulation and electrical fires. Any appliance requiring more than 1,800 watts should be on a dedicated circuit and plugged into a wall outlet. Daisy-chaining extension cords and using undersized cords for heavy appliances significantly increases fire and malfunction risks.
Read at ZDNET
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