Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 335
s rather than under them. The wires, whenthey run vertically on the walls, should be protected bysuitable boxing or run in a pipe, as shown in Fig. 257. Thershould be a clearance of at least 1 inch around the wireiwhen they are placed inside the box, which should be closed atthe top, and the holes… … Fig. 257 tubing that will extend from the insulator below the end of thepipe to the first one above it. Porcelain tubes should alwaysbe used when the wires pass through walls and floors. Thesetubes should be long enough to reach all the way throughthe wall or floor, except in special cases, when a…
Electrical engineering
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