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 82
, the supporters should be placedat closer intervals. 4. Wires run on bare ceilings of low basements, especially where theyare liable to injun,-, should be protected by two wooden guard stripsas shown in fig. 858. The protective strips should be at least J^ inch … Figs. S55 to S57.—Methods of carn-ing wires through floors. In passing through floors (orwalls) the wires often come in contact with concealed pipes or other grounded materia!,hence the only way they can be properly protected is by making the bushing continuous.This may consist of continuous…
Electrical engineering
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