When 1 or 2 generators are online, what happens to the shed buses?

When 1 or 2 generators are online, what happens to the shed buses?

• A. Shed buses energized
• B. Shed buses de-energized
• C. Shed buses powered by external power
• D. Shed buses powered by APUs

Answer: (B)

Power management on the ERJ-145 uses load shedding to keep the electrical system stable. Shed buses are nonessential circuits that can be disconnected to reduce load when generation is limited. When one or two generators are online, there’s enough generation to cover the essential buses, so the shed buses are kept de-energized. This prevents unnecessary current draw from the generators and keeps the critical systems powered reliably. External power or an operating APU would only energize shed buses if those sources are actually active and the system allows it, which isn’t implied by having one or two generators online.

Power management on the ERJ-145 uses load shedding to keep the electrical system stable. Shed buses are nonessential circuits that can be disconnected to reduce load when generation is limited. When one or two generators are online, there’s enough generation to cover the essential buses, so the shed buses are kept de-energized. This prevents unnecessary current draw from the generators and keeps the critical systems powered reliably. External power or an operating APU would only energize shed buses if those sources are actually active and the system allows it, which isn’t implied by having one or two generators online.