What is the primary purpose of grounding in electrical systems?

What is the primary purpose of grounding in electrical systems?

• A. To complete the circuit and protect people from stray current.
• B. To increase voltage across circuits.
• C. To store energy for later use.
• D. To isolate devices for safety.

Answer: (A)

Grounding provides a low-impedance path to earth for fault currents, which keeps exposed metal parts at a safe potential and lets protective devices trip quickly to clear the fault. The main purpose is safety: by directing stray current away from people and into the earth, grounding reduces the risk of shock and ensures faults are detected and interrupted. It does not aim to increase voltage, store energy, or isolate devices, so those functions aren’t the purpose of grounding. In practice, equipment is bonded to earth so that any fault current has a reliable path to ground, limiting dangerous voltages on accessible surfaces.

Grounding provides a low-impedance path to earth for fault currents, which keeps exposed metal parts at a safe potential and lets protective devices trip quickly to clear the fault. The main purpose is safety: by directing stray current away from people and into the earth, grounding reduces the risk of shock and ensures faults are detected and interrupted. It does not aim to increase voltage, store energy, or isolate devices, so those functions aren’t the purpose of grounding. In practice, equipment is bonded to earth so that any fault current has a reliable path to ground, limiting dangerous voltages on accessible surfaces.