International Library of Technology · Scranton, International Textbook Co. · leaf 651
Fig. 34. 27 INTERIOR WIRING. 57 60. Fig. 36 (a) and (/?) shows the method of mountingan outlet box in a fireproof ceiling. By crossing the ells … fig. 35. as shown at ($), the fireproof brickwork does not need to becut as much as when they are not crossed, as in (a). Theface of the box shouldcome flush with the £plastering. Cementor plaster of Parismay be run in aroundthe box and elbowsto hold them securelyin place. In work ofthis kind the…
Electrical engineering
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