International Library of Technology · Scranton, International Textbook Co. · leaf 144
e insulation. The allowablecarrying capacities of underground tubes and cables havebeen made the subject of a large number of tests by themanufacturers, who furnish tables giving the limit to which 28 ELECTRIC TRANSMISSION. 15 their cables or tubes may be loaded with safety. Thejunction box shown… … Fig. 35. 31. The underground tubes and fittings are ratherexpensive, but they are comparatively cheap to install, asall that is necessary is to dig a shallow trench and lay thetubes in the ground. This system has the disadvantagethat if any trouble occurs it is somewhat awkward to get atit, as the…
Electrical engineering
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