How do grounding and bonding differ in electrical systems?

How do grounding and bonding differ in electrical systems?

• A. Grounding connects the system to earth to stabilize voltage; bonding connects exposed conductive parts to create a common electrical potential.
• B. Grounding protects against power surges by filtering.
• C. Bonding is optional and only used for decorative purposes.
• D. Grounding bonds neutrals to earth at every point.

Answer: (A)

Grounding and bonding serve two different safety roles in an electrical system. Grounding is about giving the electrical system a reference to earth. By connecting the system to the earth, voltage levels become stabilized relative to the ground, and a low-impedance path is available for fault currents to flow back to the source. This helps systems trip protective devices and maintain a predictable reference, reducing the chance of dangerous voltages showing up on equipment. Bonding, on the other hand, is about keeping exposed conductive parts at the same electrical potential. By tying metal enclosures, pipes, conduit, and other non-current-carrying metal parts together, all those pieces share a common potential. If a fault makes contact with one part, the current has a clear path to flow and the voltage difference between parts remains small, reducing shock risk. That’s why grounding is about establishing a connection to the earth as a reference and fault-path, while bonding is about equalizing potential among metal parts to prevent shocks. The idea that grounding filters surges is not correct; surge protection is provided by devices designed for that purpose. Bonding is not decorative or optional, and neutrals are not bonded to earth everywhere—neutrals are bonded to earth only at the service equipment in most systems.

Grounding and bonding serve two different safety roles in an electrical system. Grounding is about giving the electrical system a reference to earth. By connecting the system to the earth, voltage levels become stabilized relative to the ground, and a low-impedance path is available for fault currents to flow back to the source. This helps systems trip protective devices and maintain a predictable reference, reducing the chance of dangerous voltages showing up on equipment.

Bonding, on the other hand, is about keeping exposed conductive parts at the same electrical potential. By tying metal enclosures, pipes, conduit, and other non-current-carrying metal parts together, all those pieces share a common potential. If a fault makes contact with one part, the current has a clear path to flow and the voltage difference between parts remains small, reducing shock risk.

That’s why grounding is about establishing a connection to the earth as a reference and fault-path, while bonding is about equalizing potential among metal parts to prevent shocks. The idea that grounding filters surges is not correct; surge protection is provided by devices designed for that purpose. Bonding is not decorative or optional, and neutrals are not bonded to earth everywhere—neutrals are bonded to earth only at the service equipment in most systems.