Why are electrical systems and equipment grounded?

Why are electrical systems and equipment grounded?

• A. To protect personnel, equipment and facility cabling
• B. To protect personnel and facility cabling
• C. To reduce energy consumption
• D. To increase power reliability

Answer: (A)

Grounding gives electrical systems a low-resistance path to earth and ties all exposed metal parts to a common reference. This keeps non-current-carrying surfaces at earth potential so that a fault—such as a live conductor touching a metal enclosure—creates a large fault current that rapidly travels to ground. That large current reliably triggers protective devices (like breakers or fuses), disconnecting power and reducing the chance of shock to a person. Grounding also helps limit voltage rise on equipment and cabling during faults or surges, protecting insulation and wiring from damage and providing a stable reference for proper operation. While grounding can influence reliability, its main purpose is safety—protecting people, equipment, and facility wiring from fault and surge conditions.

Grounding gives electrical systems a low-resistance path to earth and ties all exposed metal parts to a common reference. This keeps non-current-carrying surfaces at earth potential so that a fault—such as a live conductor touching a metal enclosure—creates a large fault current that rapidly travels to ground. That large current reliably triggers protective devices (like breakers or fuses), disconnecting power and reducing the chance of shock to a person. Grounding also helps limit voltage rise on equipment and cabling during faults or surges, protecting insulation and wiring from damage and providing a stable reference for proper operation. While grounding can influence reliability, its main purpose is safety—protecting people, equipment, and facility wiring from fault and surge conditions.