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Term Description
FPLR Designation of Riser cable which meets Riser flame test for Fire Protection Signaling Systems
FR-1 A flammability rating established by underwriter laboratories for wires and cables that pass a specially designed vertical flame test. This designation has been replaced by VW-1.
Frequency Number of times an alternating current reverses itself in one second. Expressed Hertz (Hz), which is one cycle per second.
FT1 A flammability rating established by CSA for wires or cables that pass a specially designed vertical flame test
FT4 A flammability rating established by CSA for multi-conductor cables that pass a specially designed vertical tray fire test
FT6 A flammability rating established by CSA for multi-conductor cables that pass a horizontal flame and smoke test; sometimes referred to as the "Steiner Tunnel Test"

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