What is the voltage range for high impedance grounds?

The voltage range classified as high impedance grounds typically falls between 480 and 1000 VAC. This classification is essential in electrical systems as it helps determine the type of protective measures required for equipment and personnel safety. High impedance grounding systems are designed to limit the ground fault current to a level that is low enough to prevent danger while still allowing the system to function normally until a fault is cleared.

This specific range denotes that voltages above 480 VAC but below 1000 VAC present a significant risk if not properly managed, thus necessitating careful consideration of grounding methods to mitigate risks associated with electrical faults. Consequently, this focuses on ensuring adequate protection without compromising the operational stability of electrical systems.