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In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and industrial construction.
William added to the company's product line with his inventions of a flexible barn door hanger (1895), barn litter carriers and tracks (1898), all-steel cow stalls (1907), individual automatic watering bowls for cows (1912), an Easy Feeding Hog Trough (1914), and an industrial line of Overhead Carrying Equipment (1917).
The term trunking is used in the United Kingdom for electrical wireways, generally rectangular in cross section with removable lids. Mini trunking is a term used in the UK for small form-factor (usually 6 mm to 25 mm square or rectangle sectioned) PVC wireways. In India, this trunking is available with self-fixing tape to ease installation. [11]
Michael Likosky and Laura Norén 26 April 2012 - Institute for Public Knowledge, New York University Law & Public Finance Center on Selection Filter
Where the tram wire crosses, the trolleybus wires are protected by an inverted trough of insulating material extending 20 or 30 mm (0.79 or 1.18 in) below. Until 1946, a level crossing in Stockholm, Sweden connected the railway south of Stockholm Central Station and a tramway. The tramway operated on 600–700 V DC and the railway on 15 kV AC.
Before and after photos of the deadly wildfires in the Los Angeles area have sent tens of thousands scrambling for safety and decimated neighborhoods.
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