Don't plug these 7 common household gadgets into an extension cord - according to an electrician
Foto: ZDNet
As many as 20% of domestic fires may be caused by faulty electrical installations or the improper use of extension cords, which are often treated as a universal solution to a lack of power outlets. Experts warn that connecting high-power appliances to popular power strips is a direct path to overheating cables and melting insulation. The "black list" of devices that must be plugged directly into a wall socket primarily includes refrigerators, washing machines, and dishwashers. Their compressors and motors generate voltage spikes that a standard extension cord may not be able to handle. Equally dangerous is powering heating appliances, such as portable heaters, toasters, or coffee machines, in this manner. These devices draw a massive amount of current in a short period, which rapidly heats the thin wires of an extension cord. For users, this necessitates a revision of the home appliance layout—especially in older buildings, where installations were not designed for such a large number of modern gadgets. Ignoring these rules poses a threat not only to expensive equipment but, above all, carries a real risk of fire, which even a fused power strip may not prevent. Energy safety begins with the conscious management of power at every point of contact with the grid.
Although extension cords are an indispensable part of almost every modern home, their improper use is one of the most common causes of electrical system fires. This problem intensifies particularly during the autumn and winter periods, when we connect heat-generating devices to the network. As experts warn, what seems like a convenient solution can actually lead to a circuit overload, melting of insulation, and in the worst-case scenario – uncontrolled ignition.
The key to understanding the danger is the fact that extension cords are designed for low-power devices such as bedside lamps, phone chargers, or laptops. However, many commonly used household gadgets require a current intensity that a standard extension cord simply cannot handle. Electricians point to seven specific groups of products that should under no circumstances be powered via a power strip or a traditional extension cord.
Portable heaters and heating devices
At the top of the high-risk device list are portable heaters. These devices generate a huge amount of heat, which involves power consumption often exceeding 1500-2000 watts. Connecting a heater to an extension cord causes the thin wires inside the cable to heat up rapidly. Unlike wall outlets, which are connected to an installation with an appropriate cross-section, extension cords do not have sufficient capacity to dissipate such large amounts of thermal energy.
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The risk increases drastically when the extension cord is coiled or covered by a rug. The heat has nowhere to escape, leading to the degradation of thermal insulation. Electricians emphasize that most fires caused by electric heaters result precisely from the use of indirect power sources, rather than a failure of the device itself. If the wall outlet is too far away, the only safe solution is to rearrange the room so that the heater is plugged directly into the wall.
Large kitchen appliances and white goods
The kitchen is the place where the most energy-intensive devices are concentrated. Refrigerators, freezers, and dishwashers are appliances that work continuously or cyclically, generating sudden surges in power consumption when the compressor or heating element starts. Connecting a refrigerator to an extension cord can not only pose a fire risk but also lead to damage to the device's electronics due to voltage drops on a cord that is too long or too thin.
- Refrigerators and freezers – require a constant, stable power supply and direct connection to a grounded outlet.
- Dishwashers – water heating cycles draw current at an intensity that can melt the plastic housing of a cheap extension cord.
- Washing machines and dryers – their motors and heating elements are too taxing for standard power strips.
Small devices with high power
A common mistake is assuming that a device's small size means low power consumption. Nothing could be further from the truth. Devices such as microwaves, toasters, or waffle makers operate on the principle of rapidly generating high temperatures, which requires a powerful energy pulse. A microwave during operation can draw as much current as a professional industrial vacuum cleaner.
Another "silent killer" of extension cords are coffee machines. The process of quickly boiling water in an espresso machine generates a load that, combined with other devices plugged into the same strip (e.g., an electric kettle), almost instantly trips fuses or causes contacts to overheat. The rule is simple: anything used for cooking, baking, or frying should have its dedicated place in a wall outlet.
Personal care and power tools
In bathrooms and bedrooms, we often use hair dryers, straighteners, or curling irons. Although we use them briefly, their power is comparable to room heaters. A 2000W hair dryer operating on an extension cord is a direct path to damaging the installation, especially in older buildings where wire parameters may already be weakened by the passage of time.
The situation is similar in home workshops. Power tools, such as circular saws, hammer drills, or angle grinders, have motors with high starting currents. Using a drum extension cord without fully unwinding it creates an induction coil that generates additional heat, potentially leading to the cable melting in minutes. If you must use an extension cord in the workshop, make sure it is a "heavy-duty" model with appropriate wire thickness, intended for industrial applications.
Risk analysis and responsible powering
The problem with extension cords is that they provide a false sense of security. Most users do not check the permissible load expressed in amperes (A) or watts (W), which is stamped on the bottom of the strip's housing. Exceeding these values by just 10-20% will not cause an immediate explosion, but it will initiate a process of slow insulation charring, which over months can lead to an arc fault.
"The biggest mistake is daisy-chaining extension cords, i.e., plugging one into another. This creates enormous electrical resistance and drastically increases the risk of fire, which even a standard overcurrent circuit breaker in the distribution board may not detect," warn industry experts.
In an era of an increasing number of gadgets in our homes, the only permanent and safe solution is to modernize the electrical installation and install additional wall outlets by a certified electrician. Extension cords should remain a temporary solution for low-power equipment. Investing in electrical safety is not only about protecting expensive equipment but, above all, preventing a tragedy that can be avoided by following a simple rule: always plug heat-generating devices directly into the wall.
