Which component is used to limit fault current during ground faults?

• A. Circuit breaker
• B. Neutral-grounding resistor
• C. Cable tray
• D. Dielectric material

Answer: (B)

Ground fault current needs to be kept at a safe, predictable level so protective devices can respond without excessive damage. A neutral-grounding resistor places impedance in the grounding path from the system neutral to earth, so if a ground fault occurs, current can flow but is limited by that resistor. This reduces arcing energy and insulation stress, and helps protection relays detect the fault reliably and trip appropriately. The circuit breaker is the device that interrupts current when a fault is detected, but it doesn’t set or limit the fault current itself. Cable tray and dielectric material serve structural or insulating roles and do not limit fault current during ground faults.