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National Electrical Code (NEC): Standards recommended practices specifications and directions for electrical wiring of residential, commercial, industrial and farm buildings. Published by National Fire Prevention Association.

Neodymium iron boron: A type of rare earth permanent material.

NTC- Negative Temperature Coefficient: A negative temperature coefficient thermistor is used to detect and protect a motor winding from exceeding its maximum temperature rating. Resistance of the device decreases with an increase in temperature.

Noise (Electrical): Interferance-type problems within electrical circuit and associated wiring that can cause eratic and improper operation of equipment.