How is the control unit powered?

• A. 24 VDC from the ship's battery
• B. 115 VAC, single-phase power from the ship's lighting distribution system
• C. 12 VDC regulated supply
• D. 115 VAC, single-phase power from shore distribution

Answer: (B)

The control unit is designed to run off the ship’s standard AC electrical system, specifically 115 VAC single-phase from the lighting distribution. This keeps the unit tied to the ship’s regular power infrastructure, ensuring a stable, readily available supply without needing battery power or shore connections. Using 115 VAC from the ship’s lighting distribution also means the unit shares the same protective devices and power management as other equipment on board, making wiring and operation simpler and safer.

Power from a ship’s battery (DC) would require conversion and isn’t the intended supply for this unit, while shore power is only available when the vessel is connected to shore facilities. The 12 VDC option would imply a different internal design and regulation that isn’t indicated for this device.