In which scenario are impedance grounded neutral systems permitted?

Impedance grounded neutral systems are specifically designed to control the flow of ground-fault current during a fault condition. The main purpose of using an impedance in the grounding system is to limit the magnitude of the ground-fault current, which helps protect equipment and personnel while maintaining system reliability. By allowing only a limited amount of current to flow during a fault, these systems can reduce the risk of damage and facilitate fault detection without causing widespread outages.

This approach enhances safety and operational continuity in situations where ground faults might otherwise lead to excessive currents, which could damage equipment or pose a safety hazard. Therefore, scenario A accurately reflects the purpose and usage of impedance grounded neutral systems. This grounding method is often utilized in systems that need to maintain operational integrity during ground faults, making it a crucial component in electrical safety management strategies.