When are impedance grounded neutral systems required to be grounded?

Impedance grounded neutral systems are governed by specific provisions within the National Electrical Code (NEC) that dictate when grounding is necessary. The requirement for these systems to be grounded is laid out in the NEC and specifies conditions under which grounding must occur. Grounding helps provide a path for fault currents and increases safety by minimizing the risk of electric shock and fire hazards associated with ungrounded systems.

The necessity for grounding an impedance grounded neutral system is contingent upon defined criteria in certain articles, which address the characteristics and operational safety of electrical systems. These articles detail the requirements and best practices for grounding based on system voltage, type, and usage, ensuring compliance with safety regulations.

In contrast, the other options focus on general voltage thresholds or transformer configurations, which do not capture the specific code requirements for impedance grounded neutral systems effectively. As a result, understanding the conditions detailed in the specific provisions within the NEC is essential for proper grounding practices in these systems.