[P]

Planetary Cabler - a cabler of laying down any number of shielded, over braided or jacketed singles, pairs, called groups or any combination of them in a sequence.

Planetary Twister - a twisting machine whose payoff spools are mounted in rotating cradles that hold the axis of the spool in a fixed direction as the spools are revolved so the wire will not kink as it is twisted.

Plastic - High polymeric substances, including both natural and synthetic products that are capable of flowing under heat and pressure, called thermoplastics. Unlike rubber and other thermoset compounds, plastics can be remelted and reused.

Plastic Deformation - change in dimensions under the 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 - A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system. A description for a cable that passes the UL 910 CMP flame test requirements.

Plenum Cable - cable approved by Underwriters Laboratories for installation in plenums without the need for conduit.

PLTC - NEC type designation for Power-Limited Tray Cable for use in class 2 or 3 Power-Limited circuits; instrumentation supervisory control, and thermocouple extension.

Polybutadiene - A type of synthetic rubber often blended with other synthetic rubbers to improve their properties.

Polyester - Polyethylene terephthalate which is used extensively in the production of a high strength moisture resistant film used as a cable core wrap.

Polythylene - A thermoplastic material having excellent electrical properties. Low dielectric constant, a stable dielectric constant over all frequencies, very high insulation resistance. In terms of flexibility, polyethylene can be rated stiff to very hard, depending on molecular weight and density - low density being the most flexible and the high-density, high-molecular weight formulation being very hard. Moisture resistance is rated excellent.

Polymer - A substance made of many repeating chemical units or molecules. The term polymer is often used in place of plastic, rubber, or elastomer.