Hawkins Electrical Guide v. 04 (of 10) / 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

by N. Hawkins

Fig. 994.—Two wire multiple system as used with isolated plant.

Ques. What wiring system should be used with a private or isolated plant?

Ans. The two wire multiple system as shown in [fig. 994].

Ques. When the central station is to supply power as an auxiliary in case of break down, how should the connection be made?

Ans. The supply from the central station should be connected to the wiring system through a double throw switch, as in [fig. 995], so that either source may be thrown into circuit.

Ques. How are the connections made when the auxiliary supply is brought in through a three wire system?

Ans. A double throw three pole switch is used as shown in [fig. 995].

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