What is the function of the protective earth conductor in outlet circuits?

What is the function of the protective earth conductor in outlet circuits?

• A. It provides a low-impedance path to earth for fault currents, enabling protective devices to trip and reducing shock risk.
• B. It carries normal current to outlets.
• C. It stores surge energy to protect equipment.
• D. It is optional and only used in older installations.

Answer: (A)

The protective earth conductor provides a low-impedance path to earth for fault currents. In normal operation it carries little or no current, but if a fault makes a metal part become energized, the fault current flows through the earth conductor to the grounding system. This high fault current is enough for the overcurrent protection (breaker or fuse) to trip quickly, disconnecting power and reducing the risk of electric shock. The earth path also helps keep exposed metal parts near earth potential. It is not used to carry normal current, not for storing surge energy, and modern installations require it rather than making it optional.

The protective earth conductor provides a low-impedance path to earth for fault currents. In normal operation it carries little or no current, but if a fault makes a metal part become energized, the fault current flows through the earth conductor to the grounding system. This high fault current is enough for the overcurrent protection (breaker or fuse) to trip quickly, disconnecting power and reducing the risk of electric shock. The earth path also helps keep exposed metal parts near earth potential. It is not used to carry normal current, not for storing surge energy, and modern installations require it rather than making it optional.