What is the fundamental difference between grounding and bonding?

What is the fundamental difference between grounding and bonding?

• A. Bonding is the process of grounding the electrical system at the service equipment.
• B. Grounding establishes a reference point to stabilize voltages, while bonding ensures conductive parts maintain equal potential to reduce shock risk.
• C. Grounding reduces fire hazards by distributing load.
• D. Bonding provides a physical shield against EMI.

Answer: (B)

Grounding and bonding serve different safety roles in an electrical system. Grounding creates a reference point by connecting the system to the earth, giving a low-impedance path for fault currents so protective devices can trip and system voltages stay within safe limits. Bonding, on the other hand, ties all exposed metallic parts together so they sit at the same electrical potential, preventing dangerous voltage differences that could cause shock or arcing between surfaces. So, grounding provides the earth reference and fault-path for protection, while bonding ensures conductive parts stay at equal potential to reduce shock risk. The other descriptions mix up purposes—for example, grounding isn’t primarily about distributing load to reduce fire hazards, and bonding isn’t specifically about shielding against EMI.

Grounding and bonding serve different safety roles in an electrical system. Grounding creates a reference point by connecting the system to the earth, giving a low-impedance path for fault currents so protective devices can trip and system voltages stay within safe limits. Bonding, on the other hand, ties all exposed metallic parts together so they sit at the same electrical potential, preventing dangerous voltage differences that could cause shock or arcing between surfaces.

So, grounding provides the earth reference and fault-path for protection, while bonding ensures conductive parts stay at equal potential to reduce shock risk. The other descriptions mix up purposes—for example, grounding isn’t primarily about distributing load to reduce fire hazards, and bonding isn’t specifically about shielding against EMI.