What is the maximum distance a strobe should be from the end of a corridor or hallway?

• A. 5 feet
• B. 10 feet
• C. 15 feet
• D. 20 feet

Answer: (C)

Strobe devices are used to provide visible notification along a corridor, so people at the far end can see the alarm signal quickly. To ensure no one in the hallway end misses the flash, the devices should be spaced so that the farthest point from a strobe is within about 15 feet. With typical mounting heights and lighting conditions, 15 feet gives reliable visibility and avoids dead zones, while keeping installation practical and cost-effective. Placing a strobe farther away (like 20 feet) risks a lack of immediate visibility for someone at the end of the hall, whereas placing them much closer (5 or 10 feet) would be unnecessarily dense. Therefore, the maximum recommended distance is 15 feet.