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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.
- Eliminates phase-to-ground arc-flash incidents
- Eliminates transient overvoltages
- Reduces point-of-fault damage
- Can provide continuity of service during a ground fault
- Includes current transformer and ER series sensing resistor for use with Littelfuse monitoring relay and for ease of installation
NGRUS Parts
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Filters
NGRUS 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.
