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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 |