Which DC bus is not normally displayed on the DC synoptic page?

• A. DC bus 1
• B. DC emer bus
• C. DC bus 2
• D. DC feed bus

Answer: (B)

The DC synoptic page is designed to display the normal power distribution to the main DC buses during everyday operation. DC bus 1, DC bus 2, and the DC feed bus are part of that standard distribution and are shown so you can see how power is flowing under normal conditions. The DC emergency bus, on the other hand, is a backup bus that only comes into play when an emergency power source is active, to keep essential systems powered. Because it’s not part of the normal distribution and is used only in emergencies, it isn’t typically displayed on the DC synoptic page. It is usually monitored on a separate emergency-power context or annunciator.