Power strips make life easier. But they’re not built to handle every device in your home. Plug in the wrong thing, and you risk overheating the strip, damaging your electronics, or even starting a fire. Most people use power strips without thinking twice, but that’s a problem. Knowing what not to plug in is just as important as knowing what’s safe. Here are 11 things you should never plug into a power strip—and why it matters.
1. Refrigerators
Refrigerators cycle on and off all day. Each cycle draws a heavy load of power. That kind of load puts major stress on a power strip. It causes overheating, short circuits, or even fires. Most power strips aren’t built for that level of energy. They’re designed for low-wattage devices like lamps and chargers. Even compact or mini fridges pose the same risk. Always plug your refrigerator directly into a wall outlet with a dedicated circuit. It’s safer, more reliable, and protects both your appliance and your home.
2. Microwaves
Microwaves pull a surprising amount of power in a short time. Some use over 1,000 watts during normal use. That sudden burst of energy can overheat a power strip fast. Even newer strips with built-in surge protection may not be rated for the load. A microwave’s internal components also create power spikes. That combination makes them a major fire hazard when used with strips. Always use a wall outlet for your microwave. Whether it’s a large kitchen model or a small dorm-room version, keep it off the strip.
3. Space Heaters
Space heaters are a leading cause of electrical fires. They produce intense heat and demand serious energy. Most portable heaters use 1,500 watts or more. That level of power exceeds what most strips can handle. Plugging a heater into a strip can melt plastic, trip your breaker, or ignite a fire. Manufacturers even include warnings against power strip use. Always connect heaters directly to a grounded wall outlet. And never leave them unattended. Even when used properly, space heaters need close supervision.
4. Air Conditioners
Like refrigerators, air conditioners cycle on and off. But they also spike power at startup. That surge can instantly overload a strip. It may cause the strip to fail or your fuse box to trip. Larger units can pull enough current to start a fire. Even smaller portable models are risky. Always plug air conditioners into a wall outlet. Use a dedicated circuit if possible. And never run other high-power devices on the same line.
5. Hair Dryers and Flat Irons
Styling tools heat up fast and draw a lot of current. Hair dryers, curling irons, and flat irons can easily overload a strip. They spike electricity when turned on and continue to use power while heating. That can melt cords or damage cheap strips. Using them in a bathroom adds extra risk. Water and electricity don’t mix. Use a wall outlet near the mirror. Unplug your tools when finished. It saves energy and prevents overheating.
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6. Toasters and Coffee Makers
These small appliances seem harmless. But they use heating elements that pull a lot of electricity. Toasters use fast bursts of heat that stress power strips. Coffee makers run water pumps and warmers at the same time. That combined load can trip a breaker or damage your strip. Never plug either one into a shared power source. Always use a wall outlet. And if you have limited space, rotate devices—not strips.
7. Washers and Dryers
This one might sound obvious, but it happens more than you’d think. Washers and dryers are high-load appliances. They need a dedicated 240-volt outlet—far beyond what a power strip can support. Plugging one into a strip won’t just damage the appliance. It could melt wires or cause an electrical fire. Compact or stackable units still draw too much power. If you don’t have the right outlet, call an electrician. Never cut corners with major appliances.
8. Sump Pumps
Sump pumps protect your home from flooding. They need steady, uninterrupted power—especially during storms. If your power strip fails during heavy rain, the pump stops working. That could result in thousands of dollars in water damage. Power strips also aren’t meant for damp basements. Moisture increases the chance of shorts or corrosion. Always plug sump pumps directly into a grounded wall outlet. For extra protection, install a battery backup or generator. Don’t risk your entire basement to save one outlet.
9. Medical Equipment
Devices like CPAP machines, oxygen generators, and feeding pumps require constant, reliable power. Plugging them into a strip adds a point of failure. If the strip fails or trips, the device shuts down. That can be dangerous or even life-threatening. Surge protectors labeled for medical use are rare and expensive. Most aren’t hospital-grade. It’s best to plug these devices directly into a grounded wall outlet. If needed, label that outlet clearly to avoid accidental unplugging. Your safety—and health—depend on it.
10. Power Tools and Shop Equipment
Workshop tools often have motors that draw power in sudden spikes. Saws, drills, air compressors, and grinders all start with a jolt. That surge can instantly overload a power strip. Long-term use can also damage the motor or tool. Plug these tools directly into grounded outlets. Use heavy-duty industrial strips only if they’re rated for workshop use. And avoid running multiple tools at once from the same source. It’s better to switch between outlets than to risk a meltdown.
11. Extension Cords
Plugging an extension cord into a power strip is known as daisy chaining. It’s a major safety hazard. Every added cord increases electrical resistance. That creates more heat, especially under furniture or rugs. If the load is too high, the cords can overheat or catch fire. You also lose track of how many watts you’re pulling. Instead, use a single, longer heavy-duty cord rated for your device. Or install additional outlets in key locations. Avoid connecting strips to cords or each other at all costs.
The Dangers of Overloading Power Strips
Power strips are designed for light-duty tasks. They usually support up to 1,800 watts in total. Many appliances use more than that on their own. When you overload a strip, it heats up. That heat damages the internal wiring and weakens the plastic casing. Eventually, it can short out or catch fire. Cheaper or older strips are even riskier. If a strip is hot to the touch, unplug it immediately. Never cover strips with rugs, furniture, or curtains. They need space to release heat safely.
How to Use Power Strips Safely
Choose strips with built-in surge protection. Look for a UL or ETL certification on the label. Avoid using them for more than one high-wattage device at a time. Don’t use power strips in the bathroom or near sinks. Moisture increases the risk of short circuits. Always unplug the strip when not in use. Don’t daisy chain strips or use them with extension cords. Make sure cords are visible and not crimped by furniture. Replace damaged strips right away. Safety starts with knowing your limits—and the limits of your gear.
When It’s Time to Upgrade
If you find yourself constantly needing more plugs, it’s time to upgrade. New outlets cost less than you might think. A licensed electrician can install wall outlets in safer, more useful locations. You can also add circuits for high-power appliances. That reduces the risk of overloading a single line. Don’t keep stacking plugs or adding strips. Every extra connection increases fire risk. A smarter setup now prevents bigger problems later. Invest in your safety—not just convenience.
Final Thoughts
Power strips are helpful, but they’re not a cure-all. Treat them as tools with clear limits. Don’t push their capacity by plugging in powerful devices. Use wall outlets for appliances, heaters, and anything medical. Stick to small electronics like lamps, chargers, and clocks. Unplug strips when not in use. Keep cords visible and check them often. And never daisy chain cords or overload circuits. The more you know, the safer your space will be. Use power strips smartly—and stay protected.
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