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Locating underground cables—as well as other underground facilities—is an integral pre-excavation process mandated by laws and guided by a number of industry standards. [4] During excavations, underground cables become at risk of getting damaged.
Washington, D.C., had a large network of conduit lines to avoid wires, as required by an 1889 law. Some lines used overhead wires when they approached rural or suburban areas. The last such line ran to Cabin John, Maryland. The current collector "plow" was mounted underneath the car on a fitting just forward of the rear truck on PCC streetcars ...
To locate a fault in the cable, the cable must first be tested for faults. Cable testing is therefore usually performed first in cable fault location. During the cable test, flash-overs are generated at the weak points in the cable, which can then be localised.
Utility location is the process of identifying and labeling public utility mains that are underground. These mains may include lines for telecommunication , electricity distribution , natural gas , cable television , fiber optics , traffic lights , street lights , storm drains , water mains , and wastewater pipes.
An Amtrak catenary maintenance vehicle. Both a crane and a movable platform can be seen on the vehicle's roof. A catenary maintenance vehicle (also known as a tower wagon or tower car) is a railroad maintenance of way vehicle that is used to maintain and inspect overhead line (also known as catenary) on electrified railroad or metro tracks.
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.
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When used on a tram or trolley car (i.e. a railway vehicle), a single trolley pole usually collects current from the overhead wire, and the steel rails on the tracks act as the electrical return. To reduce electrolytic corrosion of underground pipes and metallic structures, most tram lines are operated with the wire positive with respect to the ...