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Dayton-Phoenix high-voltage grid resistors are designed to function and survive for 20 years in the dirty, noisy, cramped quarters of a locomotive, under a transit car, or on the rooftop of an electric bus. The resistors are designed to meet stringent requirements of vibration, dust, humidity, caustic wash solutions, metal and fiber dust coatings from mechanical brake linings and are designed to meet specific inductance and electrical creepage and air gap requirements.