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Term Description
Ohm Unit of resistance such that a constant current of one ampere produces a force of one volt
Optical Fiber Cable UL (Underwriter's Laboratories) Standard 1651; National Electrical Code (NEC) Article 770 of NFPA 70
OSHA Abbreviation for Occupation Safety and Health Act (specifically the Williams-Steiger law passed in 1970, covering all factors relating to safety in places of employment)
Outgassing The percentage of gas released during combustion of a material
Overall Diameter Finished diameter over wire or cable
Overcoat Individual strands of tin copper wire stranded together and then covered with a tin coating
Overcoated Copper Stranded conductor with overall tin coating, typically used in AWG sized 28 through 18 AWG
Overlap The amount the trailing edge laps over the leading edge of a tape wrap
Oxygen Index Percentage of oxygen necessary to support combustion of a specified material
Ozone A highly active form of oxygen produced by the passage of electric discharges or sparks through air or oxygen
P.O.S. Abbreviation for Point-of-Sale
Pair 2 insulated wires of a single circuit associated together
Pairing The union of 2 insulated single conductors through twisting
PAP A commonly used term for air core (unfilled) direct burial telephone cable with a corrugated aluminum shield
Parallel Cable Two insulated conductors in parallel in a cable
PASP An air core (unfilled) direct burial telephone cable used in areas subject to rodent attacks. It consists of an unfilled cable core, corrugated aluminum shield, corrugated steel tape, flooding compound and polyethylene jacket.
Peak Voltage The maximum instantaneous voltage
Pennsylvania Bureau of Deep Mine Safety (P-MWMS) Responsible for the health and safety of underground mines, caves and other commercial operations
Percent Conductivity Conductivity of a material expressed as a percentage of that of copper
Periodicity The uniformly spaced variations in the insulating diameter of a transmission cable that result in reflections of a signal, when its wavelength or a multiple thereof is equal to the distance between two diameter variations
Permittivity See definition for "Dielectric Constant"
Pick Distance between two adjacent crossover points of braid filaments
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 multi-conductor 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 A flammability rating established by Underwriters Laboratories for wires and cables that pass a specially designed vertical flame test. This designation has been replaced by VW-1.
Polychloroprene A synthetic rubber that possesses better characteristics than SBR, used mostly as jacket material. Has operating temperature range of -55°C to 90°C.
Polyester Polyethylene terephthalate which is used extensively in the production of a high strength moisture resistant film used as a cable core wrap

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