In a plug, which wire is known to be live?

The brown wire is identified as the live wire in a plug. Its primary role is to carry current from the power source to the electrical device. In wiring systems, the live wire is responsible for providing power, and it typically carries a voltage of 230-240 volts in the UK and similar regions, making it essential for ensuring that electrical devices function properly.

Understanding the color coding of electrical wires is crucial for safety and functionality. The brown wire being live means that it should always be treated with caution, as it can pose a danger if mishandled.

In contrast, other wires such as the blue wire are designated as neutral, which carries current away from the device and back to the power source but does not carry a live voltage under normal circumstances. The green wire typically represents the earth or ground, providing a safe path for electricity in case of a fault. In some systems, black wires might be used for various purposes, including as a second live wire in a circuit, but they are not standardly understood to be the live wire in conventional wiring. Knowing the function of each color is vital for proper electrical safety and installation practices.