UNDERGROUND WIRING


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UNDERGROUND WIRING
UNDERGROUND WIRING101. Underground systems are of three main types: Duct line Cable buried directly in the ground Conduits located in tunnels A duct line consists of one or more conduits spaced close together with or without a concrete casing. The duct line is laid in a trench with the top at least 2 ft (0.6 m) underground and covered over with earth; it should be covered with pavement if it is located under a street. The duct lines terminate in underground vaults, called manholes, where transformers and protective equipment are located and where cable splices are made. The cables are drawn into the ducts from …
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. UNDERGROUND WIRING, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export