FLASHOVER - A disruptive discharge in the form of an arc or spark between two electrical conductors or between a conductor and earth.
FLASHOVER VOLTAGE - The voltage between two conductors at which flashover just occurs. The dry flashover voltage is the voltage at which flashover occurs when the conductors are separated by a clean dry insulator. The wet flashover voltage is the voltage at which flashover occurs when the clean insulator is wet.
FLAT CONDUCTOR - A wire having a rectangular cross section as opposed to round or square conductors.
FLEX. - Abbreviation for flexible.
FLEXLIFE - The measure of the ability of a conductor or cable to withstand repeated bending.
FLEXOPRENE® - Standard Wire & Cable Co. trademark for flexible, oil resistant portable cord and cable.
FLUOROCARBON - Any of various chemically inert compounds containing carbon and fluorine used chiefly as lubricants, refrigerants, nonstick coatings, and formerly aerosol propellants and in making resins and plastics.
FLUOROPOLYMER - Insulations or jackets char- acterized by the presence of fluorine in the formula- tion.
FM - Abbreviation for frequency modulation.
FOAMED PLASTICS - Insulations having a cellular structure.
FP - Abbreviation for fluorocarbon polymer, modified polytetrafluoroethylene (PTFE). See polytetrafluoroethylene.
FPL - Abbreviation for fire protective power-limited signaling circuit cable.
