Why is proper bonding and grounding essential in LV installations?

• A. Prevents shock, reduces voltage differences, and ensures safe operation during faults
• B. Increases system impedance to limit current
• C. Reduces energy efficiency
• D. Complicates wiring

Answer: (A)

Bonding and grounding create a safe electrical reference and a low-impedance path for fault currents. By bonding, all exposed metal that could become energized is kept at the same potential, so there’s no dangerous voltage difference between parts you might touch. Grounding ties the system to earth, providing a quick, low-resistance route for any fault current to return to its source. This ensures faults are detected fast by protective devices, keeping shock risks down, reducing dangerous touch and step voltages, and limiting damage during faults. The other ideas—increasing impedance, lowering energy efficiency, or complicating wiring—do not improve safety or fault clearance, so they’re not the aim of proper bonding and grounding.