Which condition is NOT necessary to qualify for using a high-impedance grounded neutral system?

To determine why the option indicating continuity of power is not necessary for qualifying a high-impedance grounded neutral system, it's important to understand the purpose and characteristics of this type of grounding. A high-impedance grounded neutral system is designed primarily to limit fault current levels in electrical installations, helping to minimize the potential for equipment damage and improve safety.

Low fault currents are indeed a critical condition for this type of system, as the intent is to reduce the magnitude of short-circuit currents that could otherwise cause problems in electrical systems. Grounding at multiple points is also relevant because it allows for better distribution of grounding, which can be beneficial in maintaining system stability and performance.

Working in hazardous locations pertains to safety considerations that must be adequately addressed to prevent electrical hazards. However, while these aspects are essential for ensuring safe and effective operation in certain contexts, they do not directly qualify the system for high-impedance grounding, which is more focused on managing fault current levels than on ensuring uninterrupted power supply.

Thus, continuity of power is not a criterion essential to the qualification of this grounding system, as it primarily concerns fault current control and safety in operational contexts, rather than commitment to uninterrupted service.