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The question of whether you can plug an extension cord into a power strip is one that often arises in both home and workplace settings. Understanding the implications and safety aspects is crucial to avoid potential electrical hazards.

General Considerations
At first glance, it might seem convenient to daisy - chain an extension cord (also known as a power extension lead) into a power strip. A power strip is designed to provide multiple outlets in one unit, allowing you to connect several electrical devices. An extension cord, or power extension lead, on the other hand, is used to extend the reach of an electrical outlet, enabling you to power devices that are located further away from the main source.
However, this practice can be risky. When you plug an extension cord into a power strip, you are essentially creating a longer electrical path. This increases the resistance in the circuit, which can lead to overheating. Each electrical component, including the power strip and the extension cord, has a rated capacity in terms of amperage and voltage. If the combined load of the devices connected to the power strip and the extension cord exceeds this capacity, it can cause the wires to heat up, potentially leading to a fire.

Safety Ratings and Labels
To ensure safety, always check the safety ratings and labels on both the power strip and the extension cord (power extension lead). The power strip should clearly indicate its maximum amperage and voltage ratings. Similarly, the extension cord will have its own ratings. For example, a standard household extension cord might be rated for 15 amps, while a heavy - duty power extension lead used for industrial or high - power applications could be rated for 20 amps or more.
Make sure that the sum of the power requirements of all the devices you plan to connect does not exceed the ratings of either the power strip or the extension cord. If you need to power multiple high - wattage devices such as space heaters, large - screen TVs, or power tools, it's best to use separate power sources rather than relying on a combination of a power strip and an extension cord.

Proper Usage
If you must use an extension cord with a power strip, follow proper usage guidelines. First, ensure that both the power strip and the extension cord are in good condition. Check for any signs of frayed wires, damaged plugs, or exposed conductors. A damaged power extension lead or power strip can pose a serious electrical risk.
Secondly, avoid overcrowding the outlets. Just because a power strip has multiple sockets doesn't mean you should fill them all. Overloading the power strip can cause overheating, even if you're not using an extension cord.

In conclusion, while it is possible to plug an extension cord (power extension lead) into a power strip, it should be done with extreme caution. Always prioritize safety, check the ratings of your electrical components, and use them in accordance with the manufacturer's instructions. If you're unsure about the safety of a particular setup, it's advisable to consult a professional electrician.