Describe the purpose of proper electrical grounding and bonding in plant electrical systems.

• A. Grounding provides a reference potential but does not affect fault paths.
• B. Bonding creates a protective shield around equipment to prevent EMI.
• C. Grounding and bonding both increase system impedance.
• D. Grounding provides a reference potential and fault path; bonding ensures equipotential across conductors and structures to minimize shock and interference.

Answer: (D)

The main idea is that proper grounding and bonding work together to keep electrical potentials predictable and fault currents safe. Grounding gives the system a reference point at earth and a low-impedance path for any fault current to flow to ground. This keeps normal voltages stable and allows protective devices to sense faults quickly, which limits shock hazards and equipment damage.

Bonding complements this by tying all exposed conductive parts—such as equipment frames, enclosures, conduits, and shielding—so they sit at the same electrical potential. That minimizes dangerous voltage differences that a person could encounter when touching different pieces of equipment, even if a fault occurs. It also helps keep fault currents and stray currents from taking unintended paths, which reduces electrical noise and interference.

So, grounding provides the reference and the fault current path, while bonding ensures equipotential across conductors and structures to protect people and maintain system integrity.