Ohmic decreasing electrical resistance when a temperature rise occurs.

National Pipe Thread. Estándar de hilo de Rosca usado en Norteamérica.

Chemical or electrolytic bath metal parts can be coated with a thin layer of nickel to protect a metal from oxidation.

National Electrical Manufacturers Association. Association of the United States which provides specific data for electrical components and equipment. Voluntary implementation by manufacturers.

National Electric Code. Specific set of rules developed for the safe use and use of energy and devices in the United States.