Daisy-chaining extension leads, which involves connecting one extension lead to another, is generally not safe and is discouraged due to several safety risks and electrical hazards. Here's what you need to be aware of:

1. Overloading

When you daisy-chain extension leads, you increase the risk of overloading the circuit. Each extension lead adds to the electrical load, and if the combined load exceeds the capacity of the circuit, it can lead to overheating and potential fire hazards.

2. Voltage Drop

Connecting multiple extension leads can result in voltage drop, especially if the leads are long or have a smaller wire gauge. Voltage drop can affect the performance of connected devices and may cause issues like reduced power and overheating.

3. Increased Resistance

Each connection in a daisy-chain adds resistance to the circuit, which can lead to electrical inefficiencies and heat generation. Over time, this resistance can damage the extension leads and pose safety risks.

4. Fire Hazards

Daisy-chaining extension leads increases the risk of electrical fires. Overloaded circuits and overheated extension cords are major contributors to fire hazards, which can endanger both property and lives.

5. Reduced Reliability

Using multiple extension leads in a chain reduces the reliability of your electrical setup. The more connections, the higher the chances of loose connections, which can lead to power interruptions and potential safety concerns.

Instead of daisy-chaining extension leads, it's safer to use a single, longer extension lead that matches the capacity required for your devices. If you need to extend the reach of your extension cord, consider using a single, appropriately rated cord or a power strip with surge protection.

By avoiding daisy-chaining, you can maintain a safer and more efficient electrical setup, reducing the risks associated with overloading, voltage drop, and fire hazards.