Electrical Contractor Terminology Glossary U
Electrician and Electrical Contractor Terminology.
Find an electrical engineering term alphabetically:
|UCA – Utility Communications Architecture.|
|UD – Underground Distribution.|
|UF – A thermoplastic insulated, underground feeder conductor or cable designed for use in wet locations, including direct burial.|
|UHV – See “Ultra High Voltage”.|
|UL – Underwriters Laboratories, Inc. UL is located at 333 Pfingsten Road, Northbrook, IL 60062.|
|Ultra High Voltage (UFV) – Transmission systems in the ac voltage exceeds 800,000 volts.|
|Unbalanced Loads – Refers to an unequal loading of the phases in a three-phase system.|
|Underground Residential Distribution – (URD) Refers to the system of electric utility equipment that is installed below grade.|
|Underground Utility Structure – An enclosure for use underground that may be either a handhole or manhole.|
|Unidirectional Unit – Allows inputs to be measured in one direction only. The stated output range indicates the minimum and maximum input levels.|
|Unit Electrical Relay – A single relay that can be used alone or in combinations with others.|
|Unit Protection – A protection system that is designed to operate only for abnormal conditions within a clearly defined zone of the power system.|
|Universal Bushing Well – This 200 amp rated component is used as part of a system to terminate medium voltage cables to transformers, switchgear and other electrical equipment. Universal Bushing Wells are manufactured by the Elastimold Division of Thomas & Betts.|
|Unrestricted Protection – A protection system which has no clearly defined zone of operation and which achieves selective operation only by time grading.|
|UPS – Uninterruptable Power Supply.|
|URD – Underground Residential Distribution.|
|USE – Underground Service Entrance conductor or cable.|
|USMA – Utility Supply Management Alliance, a utility industry conference held annually that is focused on the supplier/customer relationship.|
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