7 Appliances You Should Never Plug Into an Extension Cord or Power Strip
Whether you live in an apartment or own a house, running out of outlets is a common frustration. While extension cords and power strips can temporarily solve the problem, not every device is safe to use with them.
High-powered appliances like air fryers, space heaters, and some kitchen gadgets should always be plugged directly into a wall outlet. Using an extension cord or power strip with these devices can overload the cord and create a serious fire hazard. Paul Martinez, owner of Electrified NYC in Brooklyn, is clear: “No extension cords whatsoever,” he says, specifically referring to appliances that run continuously or use a heating element.
To help you stay safe, we’ve rounded up seven key devices you should always plug directly into the wall. Understanding which devices require dedicated outlets can protect both your home and your peace of mind.
1. Air Fryers
Air fryers are convenient for quickly cooking meals and sides, but they can draw up to 2,000 watts depending on size. Connecting them to an extension cord or power strip is risky and can create a fire hazard. If counter space is limited, only pull the air fryer out when you need it, and always plug it into a dedicated wall outlet.
2. Microwaves
Not all kitchens come with built-in microwaves, but if you have one, it needs its own dedicated outlet. High wattage makes microwaves unsafe for use with extension cords or power strips.
3. Extension Cords
Never plug one extension cord into another. Known as “daisy chaining,” this practice can easily overheat the cords and create a fire hazard.
4. Space Heaters
Portable space heaters are notorious fire hazards. Between 2017 and 2019, the Consumer Product Safety Commission reported that they were involved in roughly 1,700 fires per year, some of which caused fatalities.
Martinez explains, “Let’s say you connect [an extension cord] to a floor heater — the plug melts and it starts a fire. That’s why extension cords and power strips should only be used for electronics.”
5. Toasters and Toaster Ovens
Small as they may seem, toasters and toaster ovens consume a lot of energy. Toaster ovens typically require 1,200–1,400 watts, making extension cords unsafe.
Martinez warns, “If extension cords are 14-gauge and you’re running an appliance with a heating element — like a toaster oven, microwave, or dishwasher — the cord won’t handle the amperage and can burn up. That’s what causes fires in New York City.”
Fourteen-gauge cords can handle up to 1,800 watts, but any appliance above 1,500 watts should always have a dedicated outlet.
6. Refrigerators
Even though refrigerators use less power than some appliances (roughly 300–800 watts), they run continuously. Plugging them into an extension cord can increase the risk of malfunction or fire, so always use a wall outlet.
7. Air Conditioning Units
Air conditioners draw significant power, so they should always be plugged into dedicated outlets. Martinez emphasizes choosing the right size unit for your space using a BTU calculator. Undersized units force compressors to overwork, which can raise your electric bill, prevent proper cooling, and potentially cause a fire if plugged into an extension cord.
Key Takeaway
Martinez sums it up: never use extension cords with any appliance that draws substantial power. Standard home extension cords are only safe up to 15 amps (1,800 watts). Power strips and surge protectors, meanwhile, should be reserved exclusively for electronics.
