Which statement best reflects the purpose of grounding in electrical systems?

• A. Grounding reduces system voltage.
• B. Grounding is only used for data signals.
• C. Grounding provides a low-impedance path to earth for fault currents.
• D. Grounding has no impact on safety.

Answer: (C)

Grounding provides a reliable, low-impedance return path to earth for fault current. When a fault occurs—such as a hot conductor touching a metal enclosure—the fault current travels through the grounding path to earth. That sizable current makes protective devices (like fuses or breakers) operate quickly, clearing the fault and limiting the voltage on exposed surfaces, which reduces the danger of electric shock and protects equipment from damage. Grounding also helps keep system voltages stable by keeping equipment at or near earth potential during normal operation, but the main purpose is to enable rapid fault detection and clearance. The other statements miss this central function: grounding does not normally reduce system voltage during operation, it isn’t only for data signals, and it clearly enhances safety rather than having no impact.