| 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 |
