In marine systems, all main machinery spaces other than engine rooms are considered normally occupied spaces.

• A. Unoccupied spaces
• B. Hazardous areas
• C. Normally occupied spaces
• D. Restricted spaces

Answer: (C)

Spaces are classified by occupancy to guide how a fire suppression system is designed and how it interacts with people in a vessel. Normally occupied spaces are those where crew are routinely present during normal operations, so the protection plan must prioritize safe, user-friendly measures that allow ongoing work and quick evacuation if needed. In main machinery spaces other than the engine room, personnel typically enter and work as part of routine operations, so these spaces are treated as normally occupied. This classification ensures the chosen extinguishing approach balances effective fire knockdown with human safety. The engine room is treated differently because it’s a higher-hazard area with restricted access and typically requires a distinct protection approach, not counted as normally occupied.