A benefit of a split bus type aircraft electrical system is

• A. There is reduced need for frequency matching/less demand
• B. Better fault isolation
• C. Lower weight
• D. Higher maintenance cost

Answer: (A)

Split bus electrical systems have two independent bus bars, each fed by its own source or circuit. Because the buses aren’t normally connected, the two sources don’t have to share power or stay in tight frequency synchronization. That means you can run each bus independently without worrying about matching generator frequencies or perfectly balancing loads across a single common bus. The result is simpler operation and reduced inter-source demand, especially when one source is offline or when switching between sources. While other aspects like fault isolation can be relevant in certain setups, the clearest and most direct benefit described here is avoiding the need for frequency matching between sources by keeping the buses separate.