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Link has been copied to clipboardResistance Grounding
Littelfuse offers a variety of resistance grounding/NGR monitoring products that work by limiting the fault current so it does not cause unwanted fault damage, but still allows the protective relays to work as designed. These high-quality products prevent many of the problems that are associated with ungrounded and solidly-grounded electrical distribution systems. They also monitor the neutral-to-ground connection. These units can limit point-of-fault damage, eliminate transient overvoltages, reduce arc-flash hazards, and provide adequate tripping levels for selective current-based, ground-fault detection.
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Resistance Grounding Information Center
Resistance grounding eliminates transient overvoltages and single-phase arc-flash hazards by reducing the ground-fault current to 5 A, as well as the ability to locate the ground fault. Per IEEE Standard 141-1993, Arc-flash hazards are eliminated if the ground-fault current is reduced to 5 A or less. For systems 2.4 kV and higher, low-resistance grounding systems can be used. Properly sized resistance grounding systems solve two problems of ungrounded systems—transient overvoltages and difficulty locating ground faults.