Master Catalog Page 573 Glossary

Alpha Wire www.alphawire.com 1-800-52 ALPHA Specifications subject to change. For complete specifications and availability, visit www.alphawire.com. 573 NEC National Electrical Code. A consensus standard published by the National Fire Protection Association (NFPA) and incorporated in OSHA regulations. NEMA National Electrical Manufacturers Association. neoprene Thermosetting material, chemically known as polychloroprene, with excellent flame retarding and abrasion resisting qualities used as a jacketing material. NFPA National Fire Protection Association, group that publishes the NEC. noncontaminating PVC A polyvinylchloride formulation, which does not produce electrical contamination. nylon A group of polyamide polymers which are used for wire and cable jacketing. ODVA Formerly Open DeviceNet Vendors Association. OFHC oxygen-free, high conductivity copper. It has no residual deoxidant, 99.95% minimum copper content and an average annealed conductivity of 101%. ohm Unit of resistance such that a constant current of one ampere produces a force of one Volt. Ohm's law 1) volts = current x resistance; 2) current = volts/ resistance; 3) resistance = volts/ current. operating temperature range Indicates the range of temperature at which the cable or tubing can be used without loss of its physical properties. OSHA Occupational Safety and Health Act. outgassing Percentage of a gas released during the combustion of insulation or jacketing material. overlap The amount the trailing edge laps over the leading edge of a tape wrap. oxygen index Percentage of oxygen necessary to support combustion in gas mixture. ozone Form of oxygen, produced by discharge of electricity into air and harmful to certain insulation. pairing The union of two insulated single conductors through twisting. PE Polyethylene. percent conductivity Conductivity of a material expressed as a percentage of that of copper. permittivity See dielectric constant. phase 360 degrees represents one cycle. A fraction of one cycle is called a phase. pick Distance between two adjacent crossover points of braid filaments. The measurement in picks per inch indicates the degree of coverage. pico- (p) A numerical prefix denoting one-millionth of one- millionth (10 -12 ). picofarad (pF) One trillionth of a farad (10 -12 ). pitch In flat cable, the nominal distance between the index edges of two adjacent conductors. pitch diameter Diameter of a circle passing through the center of the conductors in any layer of a multiconductor cable. plastic deformation Change in dimensions under load that is not recovered when the load is removed. plasticizer A chemical agent added to plastics to make them softer and more pliable. plenum The air return path of a central air handling system, either ductwork or open space over a dropped ceiling. plenum cable Cable approved by Underwriters Laboratories for installation in plenums without the need for conduit. PLTC Power-limited tray cable. point-to-point wiring Continuous conductors terminated at each end to circuit destinations. polychloroprene Chemical name of neoprene. polyester Polyethylene terephthalate, which is used extensively in the production of a high-strength moisture-resistant film used as a cable core wrap. polyethylene A family of insulations derived from the polymerization of ethylene gas and characterized by outstanding electrical properties, including high IR, low dielectric constant, and low dielectric loss across the frequency spectrum. Mechanically rugged, it resists abrasion and cold flow. polyhalocarbon A general name for polymers containing halogen atoms. The halogens are fluorine, chlorine and bromine. polymer A material of high molecular weight formed by the chemical union of monomers. Glossary

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