Electrician and Electrical Contractor Terminology.
Find an electrical engineering term alphabetically:
Glossary U
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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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