| 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 This designation has been replaced by VW-1.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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