NM CID EL-1 Practice Questions - New Mexico CID EL-1 Electrical Distribution Systems, Including Transmission Lines Examination Exam

Compared with a single-bus distribution substation, a breaker-and-a-half scheme is selected primarily because it:

uses no circuit breakers allows a breaker to be taken out of service without dropping either of the two associated circuits can be built only at voltages under 600 volts eliminates the need for a ground grid

Correct Answer:

allows a breaker to be taken out of service without dropping either of the two associated circuits

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