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  1. It may lose half the circuits for breaker failure if circuits are not connected to both buses
  2. Any breaker cannot be taken out for maintenance separately as in single bus arrangement
  3. In double bus double breaker scheme, each circuit has only one dedicated breakers
  4. This arrangement has no flexibility in permitting feeder circuits to be connected to either bus
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Option 1 : It may lose half the circuits for breaker failure if circuits are not connected to both buses

Double bus double breaker scheme:

This configuration utilizes two buses and two breakers per circuit, both buses are normally energized and any circuit can be removed for maintenance without an outage on the corresponding circuit.

Advantage of double bus double breaker:

  • It has maximum flexibility and reliability.
  • Any fault and maintenance of one circuit breaker, power can be fed easily through another circuit breaker.

Disadvantages of double bus double breaker:

  • It is the costliest bus arrangement.
  • It may lose half the circuits for breaker failure if circuits are not connected to both buses.
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Related Questions

In the question below are given four statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: Some Train are Bus. All Bus are Branch. All Branch are Net. Some Net are Dress. Conclusions:                                                                                                     I. Some Dress are Bus.                                                  II. Some Net are Train.                                    III. Some Branch are Train.                                                                               IV. Some Dress are Train. ?
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