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A utility tunnel, utility corridor, or utilidor is a passage built underground or above ground to carry utility lines such as electricity, steam, water supply pipes, and sewer pipes. Communications utilities like fiber optics, cable television, and telephone cables are also sometimes carried.
Underground Service Alert; Utility tunnel – an alternative method of routing underground utility lines and services; Cable locator – an instrument used for detecting the presence and approximate location of buried services; Utility repair tag – a color-coded tag to identify pavement restorer that sometime has a secondary purpose for ...
Underground and underwater crossings may be a practical alternative to crossing rivers. For example, as of 2024, the Public Service Commission of Wisconsin determined that the installation cost of a 69-kilovolt aboveground power line is $284,000 per mile. In contrast, an equivalent underground line costs $1.5 million per mile.
The railway infrastructure of the London Underground includes 11 lines, with 272 stations.There are two types of line on the London Underground: services that run on the sub-surface network just below the surface using larger trains, and the deep-level tube lines, that are mostly self-contained and use smaller trains.
Bradford, Bradford West – Kirkstall substations (line partly underground) Yorkshire [12] 275 kV 53.82822°N 1.77895°W Brechfa Forest West onshore wind farm, Carmarthenshire [13] 2018 132 kV 51°59′00″N 04°09′50″W Burbo Bank offshore wind farm, Liverpool Bay – onshore substation, Denbighshire [14] 2008, 2017 220 kV 53.48°N 3.26°W ;
A three phase electric circuit terminated with a pothead Crossarms with two three phase electric circuits terminated with potheads. A pothead is a type of insulated electrical terminal used for transitioning between overhead line and underground high-voltage cable or for connecting overhead wiring to equipment like transformers. [1]
In electric power distribution, a service drop is an overhead electrical line running from a utility pole, to a customer's building or other premises. It is the point where electric utilities provide power to their customers. [1] The customer connection to an underground distribution system is usually called a "service lateral".
The system proved the feasibility of AC electric power transmission over long distances. [8] The first commercial AC distribution system entered service in 1885 in via dei Cerchi, Rome, Italy, for public lighting. It was powered by two Siemens & Halske alternators rated 30 hp (22 kW), 2 kV at 120 Hz and used 19 km of cables and 200 parallel ...