POWER LINE - See transmission line.
POWER RATING - AC voltage that can be applied between adjacent conductors.
POWER RATIO - The ratio of power appearing at the load to the input power. Expressed in db, it is equal to 10 log10 (P1/P2) where P1 is input power and P2 is the power at the load.
PPE - Abbreviation for polypropylene ethylene.
PRESSURE CABLE - Oil impregnated, paper insulated conductors. Lead or steel pipe outer covering, in which positive pressure is constantly maintained. Has higher dielectric strength, greater insulation stability, increased current-carrying capacity, and saves space.
PRICE’S GUARD WIRE - A wire conductor used to prevent surface leakage current associated with an insulator from reaching the measuring instrument during determination of insulation resistance, particularly of cables.
PRIMARY INSULATION - The first layer of non conductive material applied over a conductor, whose prime function is to act as electrical insulation.
PRIMARY VOLTAGE - Initial or main voltage.
PROP. - Abbreviation for propagation.
PROPYLENE - A flammable gaseous hydrocarbon C3H6 obtained by cracking petroleum hydrocarbons.
PS - Abbreviation for polystyrene. See polystyrene.
PS TAPE - Nonmetallic shielding, very flexible. Remains in positive contact with insulation. Prevents formation of air gaps between conductor and insulation.
