The wire that connects the metal case of an appliance to earth is called the:

The wire that connects the metal case of an appliance to earth is called the:

• A. Earth wire
• B. Live wire
• C. Neutral wire
• D. Outer insulation

Answer: (A)

The important idea here is safety through a dedicated path to ground for any fault current. The wire that connects the metal case of an appliance to earth is the earth wire because its protective role is to carry any fault current away from the user and toward the ground. If insulation fails and a live conductor touches the metal case, the earth wire provides a low-resistance route to the earth, causing a surge that makes the fuse or circuit breaker trip and cut the power, preventing electric shock. Live wires normally carry current and are dangerous to touch. Neutral wires carry current back in the circuit and are near earth potential but aren’t the safety path to ground. Outer insulation is not a conductor; it’s simply covering to insulate the wires. The earth wire is the specific protective conductor used for safety.

The important idea here is safety through a dedicated path to ground for any fault current. The wire that connects the metal case of an appliance to earth is the earth wire because its protective role is to carry any fault current away from the user and toward the ground. If insulation fails and a live conductor touches the metal case, the earth wire provides a low-resistance route to the earth, causing a surge that makes the fuse or circuit breaker trip and cut the power, preventing electric shock.

Live wires normally carry current and are dangerous to touch. Neutral wires carry current back in the circuit and are near earth potential but aren’t the safety path to ground. Outer insulation is not a conductor; it’s simply covering to insulate the wires. The earth wire is the specific protective conductor used for safety.