International Library of Technology · Scranton, International Textbook Co. · leaf 134
Fig. 21. location of the defective portion very much easier to find.Also, when the defective part is located, it can easily becut out without interfering with the operation of theremainder of the system. For ordinary low-pressure work, … ^v Fig. 22. the various joints are usually made by means of couplingboxes, or junction boxes. These are placed on the sidewalls of the manholes and are made water-tight. Fig. 22shows a coupling box. A, B, and C are the three maincables, or feeders, of a three-wire system that are to be 15 ELECTRIC…
Electrical engineering
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