The maximum distance between standard sprinklers in a light hazard is _______.

• A. 20 feet
• B. 15 feet
• C. 10 feet
• D. 25 feet

Answer: (B)

In light-hazard design, sprinkler spacing is set so the water from each head covers enough area to meet the required design density. For standard spray sprinklers used in light hazards, the maximum allowable spacing is 15 feet. This spacing ensures the spray patterns from adjacent heads overlap adequately and that no point in the protected area is left without sufficient water flow during a fire. If you push the spacing beyond 15 feet, you risk areas that don’t receive the needed density, which is why larger distances aren’t permitted for standard sprinklers in light hazards. A tighter spacing, like 10 feet, would still work but isn’t necessary and increases cost, while larger spacings such as 20 or 25 feet would fail the coverage requirements.