Where is the control unit mounted?

• A. In the main control cabinet
• B. The p-way outside the CHT room
• C. The engine room
• D. On the bridge

Answer: (B)

The control unit is placed in the p-way outside the CHT room because it needs to live in a safe, accessible, and protected space that isn’t exposed to the hazardous conditions inside the CHT room or in harsher environments like the engine room or bridge. The p-way provides a clean, ventilated corridor where electronics can be serviced easily, with shorter, neater wiring to nearby sensors and equipment, while staying away from heat, moisture, fumes, or heavy vibration. Mounting it inside the main control cabinet would crowd the cabinet and complicate maintenance; the engine room is too hot and harsh for sensitive electronics; and the bridge isn’t an appropriate location for control gear due to vibration, access, and safety considerations.