Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 288
Fig.299 could be operated satisfactorily if they were alwaysrequired in pairs, but otherwise the scheme would not bepracticable, since by turning out one lamp the other wouldalso be extinguished. There are additional drawbacks to theseries system in that the lamps must be identical, or they willnot… … Fig. 299.—Ten lamps connected series parallel ou two-wire circuit. Three-wire System.—Tliose undesirable features may beeliminated by the use of a method such as that represented inFig. 300, which is the typical diagram of a three-wire system.In stead of using a single source of 240 volts, two…
Electric machinery
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