July 3, 2011

Electrical Engineering Terms - N

  • N/C - Normally Closed
  • N/O - Normally Open
  • NAICS - North American Industry Classification System. This is used in place of the PPI (Producer Price Index) system.
  • Nameplate Rating - The normal maximum operating rating applied to a piece of electrical equipment. This can include Volts, Amps, horsepower, kW, or any other specific item specification for the equipment.
  • NEC - National Electrical Code (NFPA-70).
  • NEMA - National Electrical Manufacturers Association. NEMA provides a forum for the standardization of electrical equipment and is located at 2101 L Street N.W., Washington, DC, 20037.[http://www.nema.org/]
  • Neutral Conductor - In multiphase circuits, the conductor used to carry unbalanced current. In single-phase systems, the conductor used for a return current path.
  • Neutral Ground Reactor - A reactor used to connect the neutral point of a three phase system to ground. Neutral Ground Reactors are used to limit ground fault current on Neutral Grounded (WYE) systems.
  • Neutral Grounding Resistor - A device that connects the neutral point of a three phase system to ground. Neutral Grounding Resistors are used to limit ground fault current on Neutral Grounded (WYE) systems.
  • NFPA - The National Fire Protection Association.
  • NFPA 70E Standard - Standard that provides guidance on implementing appropriate work practices that are required to safeguard workers from injury while working on or near exposed electrical conductors or circuit parts that could become energized.
  • NIC - Network Interface Card is a device utilized by a computer to connect to a wired or wireless network.
  • Nickel Cadmium Battery - The assembly of one or more cells with an alkaline electrolyte, a positive electrode of nickel oxide and negative electrodes of cadmium.
  • No Load Loss - See "Core Loss".
  • Nominal - The normal operating value.
  • Nominal Capacity (Battery) - A designation by the battery manufacturer which helps identify a particular cell model and also provides an approximation of capacity. It is normally expressed in ampere-hours at a given discharge current.
  • Nominal Voltage - A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class.
  • Nominal Voltage (Battery) - Voltage of a fully charged cell or battery when delivering rated capacity at a specific discharge rate. The nominal voltage per cell is 2V for Lead Acid, 1.2V for Nickel-Cadmium, 1.2V for Nickel Metal Hydride and 3.9V for Lithium Ion (small cells only).
  • Non-cutoff (Lighting) - Luminaire light distribution is classified as non-cutoff when there is no candlepower limitation in the zone above max candlepower.
  • Non-Halogen Ethylene Copolymers - Non-Halogen Ethylene Copolymers combine attributes of polyethylene and polypropylene to produce cable insulating and jacketing compounds with superior fire protection. Unlike other ethylene compounds, these do not contain chemicals from the Halogen group
  • Non-Load break - Refers to a group of rubber insulating products that cannot be separated under load. Also see Loadbreak.
  • Notching Relay - A relay which switches in response to a specific number of applied impulses.
  • NPS - Negative Phase Sequence
  • Nylon - For Wire and Cable applications, Nylon, a thermoplastic compound, is used exclusively as a jacketing material. Nylon Jackets provide the insulation system a high degree of mechanical and chemical protection.

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