A high impedance grounded system is limited to systems operating at what voltage or above?

A high impedance grounded system is established to provide a certain level of safety and equipment protection, particularly in industrial and commercial environments. This type of grounding system is typically used for higher voltage levels, which aids in minimizing the current that can flow through ground faults.

The correct understanding is that these systems are designed for operation at voltages of 480 volts and above to take advantage of the benefits they provide. At these higher voltages, the system can effectively manage ground faults while also allowing for selective coordination of protective devices without unnecessary tripping during transient conditions.

In contrast, systems below this threshold, such as those at 240 volts or 360 volts, generally do not utilize high impedance grounding due to the increased risk of overvoltages and the different fault current characteristics that can occur at lower voltages. Therefore, a high impedance grounded system becomes relevant and beneficial specifically in scenarios involving 480 volts and higher.