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 83
J<--OUARD STPIP Pig. 858.—Method of protecting e.xposed wiring on low ceilings by two guard strips. … Pig. 859.—Receptacle suitable for use with open wiring, the requirement being that the con-tact ears should not be exposed. 8. In factories or other buildings of open mill construction, mains ofNo. 8 B. & S. gauge or larger wire, where they are not exposed toinjury, may be placed about 6 inches…
Electrical engineering
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