How many personnel are required to be assigned to a primary fire boundary when operating a 1-3/4 in fire hose?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (A)

A single firefighter is sufficient to be assigned to a primary fire boundary when using a 1-3/4 inch handline. This hose size is light enough to carry, advance, and operate by one person, who can establish and maintain a water curtain along the boundary to prevent the fire from spreading to adjacent spaces. The nozzle operator tunes the stream pattern—straight for reach and penetration or a fog pattern to cool and shield the boundary—while moving the line to keep a continuous barrier. The boundary’s job is to interrupt the fire’s forward progress, not to swamp it with large volumes of water, so one person can typically manage this task. If conditions require more water or other tasks are ongoing, additional personnel would be added, but for this hose size, a single member is the standard assignment.