Distinguish grounding from bonding in electrical systems.

• A. Grounding provides a reference path to earth; bonding creates a low-impedance path between metal parts to prevent shock.
• B. Grounding and bonding are the same concept.
• C. Grounding creates a low-impedance path; bonding provides reference to earth.
• D. Bonding provides a reference to earth; grounding creates a low-impedance path.

Answer: (A)

The main idea being tested is that grounding and bonding serve different safety roles in a electrical system. Grounding establishes a reference point by connecting the system to earth, which helps stabilize voltages and provides a path for fault currents to reach the earth. Bonding, meanwhile, ties together metal parts and exposed conductors so they all stay at the same electrical potential, creating a low-impedance path for fault current between metal components and enabling protective devices to trip quickly if a fault occurs. This combination reduces the chance of shock when a fault makes contact with exposed metal.

That’s why the statement describing grounding as a reference to earth and bonding as a low-impedance path between metal parts is the best fit. The other options either treat the concepts as the same or mix up which action provides the earth reference versus the fault-path bonding path.