Which devices should not be connected through an extension cord? It's really dangerous and not just in Latvia 0 12

“Devices that generate heat, have motors, or require grounding should not be connected to an extension cord,” said electrical engineering experts.

1. Powerful heaters (the most dangerous group)

Electric heaters (especially fan heaters and oil radiators), electric kettles, irons, hair dryers, electric hot plates.

They have extremely high power consumption. A typical heater consumes 1500–2500 W. This is practically the limit for a standard outlet. An extension cord, especially a cheap one or one that is coiled, is not designed for such current. In places of poor contact (in a cheap extension cord or if the plug is not inserted tightly), high resistance occurs. The wire begins to heat up, the insulation melts, and a fire can break out.

2. Large household appliances with electric motors

Refrigerator, washing machine, dishwasher, air conditioner, powerful vacuum cleaner.

When the motor of a refrigerator or air conditioner starts, the energy consumption jumps 3–5 times the nominal value for a fraction of a second. Even if the label states 500 W, at startup it can draw 2000 W.

The constant load — the refrigerator runs 24/7. If it is connected through a poor extension cord, it will constantly heat up. Over time, the contacts will loosen, and smoldering will begin.

Grounding — modern refrigerators and washing machines have a grounded plug (Euro). Extension cords are often sold without grounding, which removes protection against electric shock.

3. “Heavy” kitchen appliances

Microwave, multicooker, electric kettle, toaster, air fryer, coffee machine.

In the kitchen, there is usually one group of outlets. If an extension cord is plugged into it and a microwave (800–1000 W) and kettle (2000 W) are plugged into it simultaneously, a slow-motion short circuit is created. The total power easily exceeds 3 kW, and the wiring will begin to heat up. It is better to use such appliances one at a time and only in stationary outlets.

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4. Precise and expensive devices (risk of damage)

Computer (especially gaming), server, Hi-Fi amplifier, television.

Cheap extension cords have poor contacts and lack interference filters. They can cause voltage drops that damage computer power supplies and distort sound in audio equipment.

Exception: high-quality surge protectors and UPS can be used — this is no longer just an extension cord, but a protective device.