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FIGURE F.4 One-line diagram of double breaker-double bus configuration.

bus arrangement for a generator terminal to provide equal access to either main bus.

The main advantages of this scheme include:

•   Flexible operation,

•   Very high reliability,

•   Isolation of either main bus for maintenance without disrupting service,

•   Isolation of any circuit breaker for maintenance without disrupting service,

•   Double feed to each circuit,

•   No interruption of service to any circuits from bus fault,

•   Loss of only one circuit for breaker failure, and

•   All switching with circuit breakers.

The primary disadvantage of this scheme is high cost because two circuit breakers are required for each circuit.



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