Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 85
Fig. 867.—Porcelain tube for entrance of wire into a building. There must be a drip loop out-side to drain off water, and the hole through which the conductor passes must be bushedwith a non-combustible, non-absorptive insulating tube slanting downward toward theoutside. The object of the… … Fig. 888.—Interior bushing. Wires must be separated from contact with walls, floors, timbersor partitions through which they may pass by non-combustible, non-absorptive, insulatingtubes, such as glass or porcelain, except at outlets where approved flexible tubing is required.Bushings must be long…
Electrical engineering
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