Which of the following is not a reason why electrical systems must be grounded?

• A. Provide a path for fault currents
• B. Reduce electrical noise
• C. Stabilize voltage
• D. Dissipate lighting

Answer: (D)

Grounding serves as a safe reference and a low-impedance path for unwanted currents. When a fault occurs, the current is directed to earth so protective devices trip quickly and exposed metal parts stay near earth potential, reducing shock risk. A solid grounding scheme also helps keep electrical noise at bay and provides a stable reference for signals, improving interference rejection. It stabilizes voltages across the system by preventing large potential differences during transients, which helps equipment operate reliably. Dissipating lightning energy isn’t a direct, standalone reason for grounding; grounding is part of protection schemes, but the primary purpose is safety and voltage/reference stability rather than “dissipating” a lightning strike on its own.