Grounding System Information

An appropriately sized APT HZR-Series High Resistance Grounding (HRG) System provides increased continuity of service due to the ability to operate a power system under a ground fault condition. The system is available in both NEMA 1 and NEMA 3R enclosures to accommodate indoor and outdoor applications

• Elimination of the stress on the power system equipment and damage to the power system equipment caused by the ground faults.
• Elimination of the arc flash hazard associated with the ground faults.
• Detection of the ground fault conditions in the previously ungrounded power systems.
• Elimination of the ferroresonance and “re-striking” overvoltages in ungrounded and high impedance grounded power systems.

Please consult an APT applications engineer if you need assistance with the selection of type of neutral grounding system and sizing of the neutral grounding devices.