NGR | Neutral Grounding Resistor - Littelfuse Also, because an NGR is used to ground the system, the very large and destructive ground-fault currents of solidly grounded systems are absent. Ground-fault relays (such as the SE-701) can be used on feeders to provide selective coordination and the ability to quickly locate or isolate the fault. What is the main reason of using NGR in a power transformer? Sep 02, 2016Before going to the reason of using NGR one should first know what is NGR? NGR(Neutral Grounding Resistor) is nothing but a high resistance grounding which in context of electrical power system means the grounding of the system neutral through a r..[PDF] com ElectricalPartManuals figure 2 wiring diagram for gemini figure 3 outside dimensions contact opens at 110 ° c. and closes at 102 ° c. 301 heat sensor notes: 1) all contacts shown in the ngr fault power on zone gr. on ngr monitor off ngr fault gnd fault sensing res. ct g/f meter ngr-gf monitor l1 l2 trip relay zone i/l test reset NGR - Electrical and Industrial Power Management Solutions ngr The field-proven NGR offers both European styling and ergonomic design while providing the solid durability that you have come to expect from Eaton switches. Illuminated and non-illuminated versions with either incandescent bulbs or LEDs are available in a variety of popular switching circuits. I-gard | I-Gard Ground Fault Protection, Power Resistors Since 1982, I-Gard has been committed to Electrical Safety providing both industrial and commercial customers with the products and application support they need to protect their electrical equipment and the people that use them.