Which statement about the earth pin is correct?

Which statement about the earth pin is correct?

• A. The earth pin is the longest, so it connects first and disconnects last
• B. The earth pin is the shortest
• C. The earth pin has no special length
• D. The earth pin is connected to the neutral

Answer: (A)

Safety in three‑pin plugs relies on the earth path being ready before anything else. The earth pin is longer than the live and neutral pins, so it makes contact first when you plug in and breaks last when you unplug. This guarantees a protective earth connection is established before any exposed metal becomes live, and remains connected while you disconnect, reducing the risk of electric shock. The earth conductor’s job is to provide a safe path for fault currents, not to carry normal operating current, and it is not connected to the neutral. So the statement that the earth pin is the longest and connects first and disconnects last is the correct description.

Safety in three‑pin plugs relies on the earth path being ready before anything else. The earth pin is longer than the live and neutral pins, so it makes contact first when you plug in and breaks last when you unplug. This guarantees a protective earth connection is established before any exposed metal becomes live, and remains connected while you disconnect, reducing the risk of electric shock. The earth conductor’s job is to provide a safe path for fault currents, not to carry normal operating current, and it is not connected to the neutral. So the statement that the earth pin is the longest and connects first and disconnects last is the correct description.