Dwelling Unit refers to?

• A. Dwelling Unit
• B. Combustibles
• C. Occupancy Classification
• D. Grade Plane

Answer: (A)

The main idea is NFPA 13R’s terminology for what the sprinkler design targets in low-rise residences. A dwelling unit is a single living space that provides complete living facilities for one or more people, with permanent provisions for living, sleeping, cooking, and sanitation. This is the unit that NFPA 13R recognizes as a separate living space within a dwelling or building, and the sprinkler requirements are applied to each dwelling unit individually.

The other terms don’t define a living space: combustibles refer to materials’ burning characteristics, occupancy classification is a broader fire-protection category, and grade plane is a construction term for the reference level. So the term that best fits the concept being tested is dwelling unit.