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| Term | Description |
|---|---|
| UF | Thermoplastic underground feeder and branch circuit cable |
| UHF | Abbreviation for Ultra High Frequency (300 to 3000 MHz) |
| UL | Abbreviation for Underwriters Laboratories, a non-profit independent organization, which operated a listing service for electrical/electronic materials and equipment |
| Unbalanced circuit | A transmission line in which voltages of the 2 conductors are unequal with respect to ground |
| Underwriters Laboratoris, Inc. (UL) | An independent, not-for-profit product safety testing and certification organization |
| Unilay | More than one layer of helically laid wires where the direction and length of lay are consistent for each layer |
| UV Resistance | The ability of a material to resist ultra violet (UV) light, or sunlight |