Glossary
Appendix D
D-16
National Bureau of Standards (NBS)
An organization under the United States Department of Commerce
responsible for developing and disseminating federal standards in
many areas.
National Electrical Code (NEC)
A set of regulations governing the construction and installation of electrical
wiring and apparatus, established by the National Fire Protection
Association and suitable for mandatory application by governing bodies
exercising legal jurisdiction. It is widely used by state and local authorities
within the United States.
NBS
See National Bureau of Standards.
NEC
See National Electrical Code.
NEMA Standards
Consensus standards for electrical equipment approved by the members of
the National Electrical Manufacturers Association (NEMA).
NEMA Type 12
A category of industrial enclosures intended for indoor use to provide a
degree of protection against dust, falling dirt, and dripping non-corrosive
liquids. They do not provide protection against conditions such as
internal condensation.
Noise
Unwanted disturbances imposed upon a signal that tend to obscure its
data content.
Noise Immunity
The ability to function in the presence of noise.
Noise Spike
A noise disturbance of relatively short duration.
Non-Volatile Memory
A memory that is designed to retain its data while its power supply is
turned off.
N
