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), 1833-1928 · New York : T. Audel & Co. · leaf 234
ing it is some distance from theground and well insulated. When it is of very large proportion andan outside equipment, it should be connected to the ground during anelectric storm with a one hundred ampere switch which is requiredfor lightning protection by fire underwriters. The ground clamp is… … <1) o o ( a 0 SENDING HEUK — s*
Electrical engineering
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