For what voltage levels is resistance grounding typically used?

Resistance grounding is a method typically used for systems operating at voltage levels of 6.6 kV and greater. This method allows a certain level of fault current to flow in the event of a ground fault, which helps to stabilize the system voltage and limit the damage caused by the fault. By using resistance grounding, it maintains the systems in a more secure condition, which reduces the likelihood of catastrophic failures or equipment damage.

In contrast, lower voltage systems, such as those operating at 1 kV or 3.3 kV, often utilize different grounding methods, such as solid grounding or ungrounded systems, depending on the specific requirements and safety considerations. The use of resistance grounding in higher voltage applications becomes increasingly important for managing the fault currents and protecting against potential hazards.