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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 – Canada is specifically designed for use in Canadian applications. For applications in the US and other parts of the world, please use the NGR series – US.
- 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
NGR Parts
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Showing 1 to 12 of 24 Total Results
| 0.05 | 480 | 0 Kg (kilogram) | No | 60 | 5 | 55.4 | 3R | Continuous | ER-600VC | ||||
| 0.05 | 600 | 0 Kg (kilogram) | No | 60 | 5 | 69.4 | 3R | Continuous | ER-600VC | ||||
| 0.05 | 480 | 0 Kg (kilogram) | No | 60 | 2 | 138 | 3R; Weather Protected Sensing Resistor | Continuous | ER-600VC | ||||
| 0.05 | 600 | 0 Kg (kilogram) | No | 60 | 5 | 69.4 | 3R; Weather Protected Sensing Resistor | Continuous | ER-600VC | ||||
| 0.05 | 480 | 0 Kg (kilogram) | No | 60 | 2 | 138 | 3R | Continuous | ER-600VC | ||||
| 0.05 | 480 | 0 Kg (kilogram) | No | 60 | 5 | 55.4 | 3R; Weather Protected Sensing Resistor | Continuous | ER-600VC | ||||
| 0.05 | 600 | No | 60 | 2 | 173.5 | 3R | Continuous | ER-600VC | |||||
| 0.05 | 600 | No | 60 | 2 | 173.5 | 3R; Weather Protected Sensing Resistor | Continuous | ER-600VC | |||||
| 0.05 | 4160 | No | 60 | 5 | 480.9 | 3R | 10 s | ER-5KV | |||||
| 0.05 | 4160 | 0 Kg (kilogram) | No | 60 | 5 | 480.9 | 3R; Weather Protected Sensing Resistor | 10 s | ER-5WP | ||||
| 0.05 | 4160 | No | 60 | 5 | 480.9 | 3R | Continuous | ER-5KV | |||||
| 0.05 | 4160 | No | 60 | 5 | 480.9 | 3R; Weather Protected Sensing Resistor | Continuous | ER-5WP |
NGR 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.
