Using an extension cord with a microwave can be unsafe for several reasons:
Power Overload: Microwaves typically draw a significant amount of power to operate properly. They are designed to be connected directly to a wall outlet that can handle the power requirements. Using an extension cord introduces additional resistance and can lead to power overload. The extension cord may not be able to handle the high power demand of the microwave, causing it to overheat, melt, or even catch fire.
Inadequate Wiring: Extension cords are often not designed to handle high-power appliances like microwaves. They may have thinner wires that cannot safely carry the current required by the microwave. Over time, the wires in the extension cord can overheat and potentially cause a fire hazard.
Voltage Drop: Long or low-quality extension cords can cause a drop in voltage due to increased resistance. This voltage drop can affect the performance of the microwave and may lead to improper cooking, overheating, or damage to the appliance.
Overheating: If the extension cord is not rated for the power load of the microwave, it can overheat due to the increased electrical current passing through it. Overheating can damage the cord, insulation, or connections, increasing the risk of fire or electric shock.
Poor Connections: Extension cords can introduce additional points of connection between the microwave and the power source. Loose or faulty connections can cause sparks, overheating, or short circuits, posing a safety hazard.
To ensure safe operation, it is generally recommended to plug a microwave directly into a properly installed and grounded wall outlet. If the location of the microwave and the outlet is not convenient, it's best to have a certified electrician install a dedicated outlet near the microwave. This eliminates the need for an extension cord and ensures that the microwave is safely powered without the risk of overloading or electrical hazards.