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 166
he point connected and ground will not exceed250 volts. The rule allows one side of a 250 volt circuit or the middle point of a 550 voltcircuit tobe grounded. The spark gaps shown above are designed for use on transformersecondary circuits and for protecting individual series arc lamps. These spark…
Electrical engineering
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