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 197
le switch. Ques. When should a knife switch be used ? Ans. When the capacity of the circuit in which it is to beplaced exceeds 10 amperes. AUXILIARY APPARATUS 409 Ques. Describe a knife switch. Ans. Fig. 461 illustrates a knife switch of the double pole,single throw type. It consists of the… … Fig. 461.—A single throw, tvo pole knife switch. As usually constructed it is made of harddrawn copper with cast terminal lugs and fibre cross bar. Otherwise if the hinges become loose, the weight of the blades andhandle would tend to close the switch, thus closing the circuit and possiblyresulting…
Electrical engineering
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