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UF. Thermoplastic
underground feeder and branch circuit cable.
UL. Abbreviation for Underwriters Laboratories,
a nonprofit independent organization, which operates a
listing service for electrical and electronic materials
and equipment. (www.ul.com)
Multi/Cable is UL certified.
Unbalanced Circuit. A transmission line
in which voltages on the two conductors are unequal with
respect to ground; e.g., a coaxial cable.
Unidirectional Concentric Stranding.
A stranding where each successive layer has a different
lay length, thereby retaining a circular from without
migration of strands from one layer to another.
Unidirectional Stranding. A term denoting
that in a stranded conductor all layers have the same
direction of lay.
Unilay. More than one layer of helically
laid wires with the direction of lay and length of lay
the same for all layers.
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