Power strips are a lifesaver when outlets are tight; but they need to be taken care of. Statistically, a large percentage of household incidents with smoke and a burning smell start with overloaded power strips or loose contacts.
The problem is not just how many devices can fit in, but what devices and how many watts they draw (continuously or at startup). Heaters, compressors (refrigerators/dehumidifiers), and “white” appliances can dangerously heat up the contacts of a strip, especially if its cable is thin or the power strip is cheap and without thermal protection.
In addition, the indication “surge protection” does not mean that it can withstand high loads; it simply protects against voltage spikes. The same goes for a switch: it is not a fuse for overloading.
To keep your home safe and your appliances healthy, just remember two principles: (1) anything that heats or has a motor/compressor goes directly to a wall outlet and (2) the total load on the power strip should ideally stay below 80% of its rated power.
Below you will find a list of “red” devices, simple load calculations, danger signs and safe alternatives.
Devices that should not be plugged into a power strip
Heating devices (high resistance)
- Fan heaters, convectors, electric radiators/stoves
- Water kettle, iron, toaster/toaster, electric oven, air fryer/air fryer, espresso coffee maker
Why: They draw a lot of electricity (often 1,500–2,500W). The connections/plugs and thin cables of power strips get hot easily.
Appliances with a compressor or motor (high starting current)
- Refrigerators, freezers, dehumidifiers
- Air conditioners (and portable ones)
- Pumps/pressurizers, large power tools
Why: They have a starting “peak” that can blow a fuse or overheat contacts. They need a direct wall outlet.
Large “white”
- Washing machine, dryer, dishwasher
Why: They combine a heating element + motor. Continuous/heavy consumption is not for a power strip.
Microwave oven
Why: Although it says “800–900W output”, the power input is usually 1,200–1,500W. It needs its own outlet.
High-power chargers/industrial devices
- Electric vehicle chargers, powerful laboratory power supplies
Why: Designed for a dedicated line/outlet with proper fuse.
Power strip “chains” & coiled extension cords
Never use a power strip on a power strip. For reels/extension cords, always unwind completely before use; coiled cord overheats.
What can go in (in moderation)
- Routers, mobile/tablet/laptop chargers, monitors, TVs, consoles, desk speakers, desk lamps.
Rule: Use a quality power strip (with thermal protection/switch, child guards, surge protection) and do not exceed 80% of its rated power.
How to calculate the load correctly
- Read the power strip rating: usually 10A (up to ~2,300W) or 16A (up to ~3,680W) at 230V.
- Add up the watts of your devices.
- Stay below 80% of the limit:
– 10A → aim for ≤ 1,840W
– 16A → aim for ≤ 2,940W - Pay attention to the “hidden” numbers: e.g. microwave 1,300–1,500W input, espresso 1,200–1,800W, kettle 2,000–2,400W, fan heater 1,500–2,500W.
Example of an error: 10A power strip with kettle (2,200W) + toaster (1,000W) = 3,200W → overload.
Example OK: PC (300W) + monitor (50W) + router (10W) + speakers (30W) ≈ 390W.
Why a power strip is not a good idea for “heavy” devices
- Overheating of contacts/plug → melting of plastics, ignition.
- Voltage drop → “strains” motor/electronics, reduces lifespan.
- Starting current → momentary spikes that no cheap strip can withstand.
- Mechanical stress → heavy plugs pull and loosen contacts.
Danger signs – stop immediately
- Hot plug/socket, hot plastic/burning smell
- Creaking/sparking, black contacts
- Frequent tripping of switch/fuse
Safer alternatives
- Direct wall outlet for high-power appliances/motors.
- Heavy-duty single-slot extension cord (not a power strip) with ≥1.5mm² wire cross-section and good quality Schuko plug—for temporary use.
- Branded 16A power strip with thermal/overvoltage protection, for light loads only.
- Electrician for additional outlets or separate line where needed.
- UPS/surge protection for sensitive electronics (PC/TV), never for heaters.
Checklist before plugging anything into a power strip
- Is it a heater, a large motor or a “white” appliance? → No, plug directly into a wall outlet.
- How many watts in total? I stay below 80% of the limit.
- Is the cable unwound (if it’s a reel) and is the plug “seated” tightly?
- Does the power strip have thermal protection, a switch, surge protection and a cable ≥1.5mm² for 16A?
- I avoid power strip chains and cheap, anonymous products.
Electrical safety in the home is not a matter of luck; it’s a matter of habit. A five-minute “audit” of your sockets today can save appliances, money and, literally, lives.
Remember: never plug anything that heats or has a compressor into a power strip, and when using a power strip, keep the total wattage below 80% of its rating.
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