International Library of Technology · Scranton, International Textbook Co. · leaf 621
rtical mains are attached 27 INTERIOR WIRING. 27 to the copper bars b, b, b; the mains enter at the bottomand pass out at the top to the floor above. 2H. Instead of building a wooden box in the wall to takethe slate or marble pieces that go to make up the cabinet,iron or steel boxes are now used in… … Fig. 12. slate slabs b. The panel board c constitutes the back ofthe box. In the figure the openings d for the branchcircuits are arranged to take conduits, but the samestyle of box can be provided with porcelain bushings forwiring done on porcelain. If it is necessary to have adistributing space,…
Electrical engineering
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