Where are the primary power sources connected to the electrical distribution system in an ERJ-145?

Where are the primary power sources connected to the electrical distribution system in an ERJ-145?

• A. They connect directly to the aircraft structure and distribute via shielded cables in the cockpit.
• B. They connect to the electrical buses via bus bars and switchgear located in the equipment bay/central electrical panel.
• C. They are isolated from the buses and feed loads through a separate battery unit.
• D. They connect only to the standby bus and not to the main distribution system.

Answer: (B)

Power from the aircraft’s primary sources is brought into a centralized electrical distribution panel in the equipment bay, where bus bars carry the load and switchgear handles the connections. This setup allows engine generators and external power to feed the main and essential buses through the bus bars, with protective devices and control switches managing and isolating sources as needed. You don’t route heavy power directly to cockpit wiring, nor feed loads through a separate battery unit, nor connect primary sources only to the standby bus. The ERJ-145 distributes power via the bus bars and switchgear housed in the equipment bay/central electrical panel.

Power from the aircraft’s primary sources is brought into a centralized electrical distribution panel in the equipment bay, where bus bars carry the load and switchgear handles the connections. This setup allows engine generators and external power to feed the main and essential buses through the bus bars, with protective devices and control switches managing and isolating sources as needed. You don’t route heavy power directly to cockpit wiring, nor feed loads through a separate battery unit, nor connect primary sources only to the standby bus. The ERJ-145 distributes power via the bus bars and switchgear housed in the equipment bay/central electrical panel.