[N]

National Electric Code (NEC) - a consensus standard published by The National Fire Protection Association (NFPA) and incorporated in OSHA regulations.

NBFU - National Bureau of Fire Underwriters. NBS - National Bureau of Standards.

NBR - Butadiene-acrylonitrile copolymer rubber, a material with good oil and chemical resistance.

NEC - See National Electric Codes.

NEMA - National Electrical Manufacturers Association.

Neoprene - trade name for polychloroprene synthetic rubber, used for jacketing when suitable compounded.

Noise - in a cable or circuit, any extraneous signal which tends to interfere with the signal normally present in or passing through the system.

Nomex - DuPont trademark for a temperature-resistant, flame-retardant nylon.

Nominal O.D. - the desired diameter for a cable that is established within a +/- tolerance.

Non-Contaminating - type of PVC jacket material whose plasticizer will not migrate into the dielectric of a coaxial cable and thus avoids contaminating and destroying the dielectric.

Non-Contaminating PVC - a polyvinylchloride formulation, which does not produce electrical contamination through plasticizer migration.

Non-Plenum - A description for a cable that does not meet the requirements of UL 910 CMP flame test. Such a cable cannot be installed in an area that is used for air return (plenum).

Nylon - a group of polyamide polymer which is used for wire and cable jacketing.