Wire-wound resistor NGRUS series

groundinghousedneutral

High-resistance grounding prevents many of the problems that are associated with ungrounded and solidly grounded electrical distribution and utilization systems. High-resistance grounding can limit point-of-fault damage, eliminate transient overvoltages, reduce the arc-flash hazards, limit voltage exposure to personnel, and provide adequate tripping levels for selective current-based, ground-fault detection and coordination. The Littelfuse Neutral-Grounding Resistor System includes a neutral-grounding resistor (NGR), current transformer, and sensing resistor installed in a NEMA 3R enclosure for use with high-resistance ground transformers and generators. The NGR system is designed for use with Littelfuse NGR resistor monitors for complete system grounding and grounding protection. This series comes pre-installed in a ventilated NEMA 3R galvanized, steel enclosure, and the components are pre-wired to terminals for ease of installation. Note: The NGR series – US is specifically designed for use in US applications and all other parts of the world except Canada. For applications in Canada, please use the NGR series – Canada. Applications • Ungrounded and solidly grounded electrical distribution and utilization systems • High-resistance grounding is applied on transformers and generators where safety and continuity of service are important • A faulted feeder may remain in operation until it is safe to repair the fault, where allowed by the local electrical code