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Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

prefix for metric unit that indicates division by one billion.
a metric measure of distance equivalent to one billionth of a meter.
National Electrical Code (NEC)
a standard for electrical construction, published by the National Fire Protection Association (NFPA 70-1). The National Electrical Code is often adopted by local jurisdictions and used by their electrical inspectors.
National Electrical Manufacturers Association (NEMA)
an electrical trade association that establishes standards for electrical equipment. In the case of electric motors, NEMA establishes standard frame sizes, starting torque, starting current, and other quantities for a given horsepower machine.
National Fire Protection Association (NFPA)
sponsor and publisher of the National Electrical Code and other safety standards.
National Television System Committee (NTSC)
a body that recommended the standard for colored television broadcasts in the U.S. in 1953. NTSC video contains 525 lines, a field rate of 59.94 fields/second, a horizontal frequency of 15,734.264 Hz, and an interlaced color subcarrier frequency of 3.579545 MHz. The NTSC format is also in use by many countries other than the U.S.
natural commutation
commutation of current from one switching device to another in a power electronics converter at the instant the incoming voltage has a higher potential than that of the outgoing wave, without the aid of any commutation circuitry.
See commutation
nautical mile (nm)
1,852 meters. Approximately 1 minute of arc on the earth’s surface.
See National Electrical Code
negative sequence
the set of balanced but reverse sequence (acb) components used in symmetrical component analysis. Normal load currents contain no negative sequence current.
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