International Library of Technology · Scranton, International Textbook Co. · leaf 135
ogether by pieces of copper bar securely clamped againstthe terminals by the bolts shown in the figure. The box isprovided with a cover that is bolted against a rubber gasket.This box is merely intended for coupling the ends of thecables together and takes the place of permanent joints thatcould… … Fig. 23. them to the various branch lines. This is done by means ofjunction boxes. Fig. 23 shows a junction box that is knownas a. four-way box, because it accommodates four positive and 20 ELECTRIC TRANSMISSION. 15 four negative cables. The box is designed for use on low-pressure, three-wire work.…
Electrical engineering
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