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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 and electronic materials and equipment
Unbalanced circuit A transmission line in which voltages of the 2 conductors are unequal with respect to ground
Unilay More than one layer of helically laid wires with the direction of lay and length of lay the same for all layers