NEUTRAL GROUNDING RESISTORS PROTECT YOUR POWER DISTRIBUTION EQUIPMENT Filnor, Inc. is the reliability leader in the power resistor industry. We provide complete technical assistance in order to meet your specifications. Filnor resistors are used for AC/DC motor acceleration, dynamic braking, ballast, load bank, neutral grounding resistors, harmonic filtering, and transit applications.

FUNCTION Neutral Grounding Resistors are used to protect power transformers, power generators and other associated equipment in your power systems against 50/60 Hz faults (short circuit) and transient phenomena (lightning). SPECIFICATIONS There are three parameters needed to specify the neutral grounding resistor. 1. Rated voltage line to neutral or system voltage 2. Rated fault current 3. Rated “time on” of the line to neutral voltage not exceeding the allowable temperature rise. RANGE • Rated current: from 1 amp to 5000 A • Rated voltage: from 0.38 to 34.5kV • Rated time: 1 sec to continuous time rating TESTING AND QUALITY All Filnor Neutral Grounding Resistors are designed, rated, manufactured and tested in strict compliance with IEEE-32. Routine tests performed on each Neutral Grounding Resistor are measurement of resistance, high voltage power frequency, insulation measurement, aspect verification, dimensional control. Filnor’s internal quality system has been developed and certified under ISO 9001 quality system. CONSTRUCTION Standard unit includes the stainless steel resistor assembly plus all the required insulators, internal connections and hardware installed in a standard safety enclosure. Neutral Grounding Resistor units are completely assembled, prewired, and tested at our facility. For shipping all units are crated for added protection and ease of handling. ENCLOSURE FEATURES • Solid overhung top slightly sloped to prevent standing water and will support heavy ice and snow. • Forged eyebolts in all four corners for easy hoisting. • Removable front and rear louvered covers for easy access for connection and inspection. • Corrosion resistant nameplate provides complete ratings and manufacturers information. • Heavy powder coat ASA 70 Grey finish provides maximum protection. • Bottom screening prevents the entry of birds and rodents while providing maximum cooling for the resistors. ENCLOSURE OPTIONS • Aluminum, mill galvanized, stainless steel and hot-dipped galvanized construction. Custom paint finish is available. • Top or side mounted entrance bushing(s). • Screened covers for indoor applications. • Support stands for elevating the enclosure above ground. OPTIONS • Current or potential transformers mounted and prewired at our facility • ON or OFF Load disconnecting switches • Space heater • Specially designed units for hazardous or high altitude locations

Filnor, Inc. is a Certified ISO 9001 Company.