Detectors on a peaked ceiling shall first be spaced and located within ____ feet of the peak, measured horizontally?

Detectors on a peaked ceiling shall first be spaced and located within ____ feet of the peak, measured horizontally?

• A. 3
• B. 2
• C. 6
• D. 1

Answer: (A)

On peaked ceilings, the highest point is where smoke and heat tend to reach first and can move along the ceiling, so early detection must cover that apex area. Placing the first detector within a short horizontal distance from the peak ensures smoke is detected quickly before it spreads down the slope. The distance is measured horizontally to keep a consistent standard regardless of how steep the ceiling is, since measuring along the slope would give a misleading sense of how close the detector is to the apex. So the best approach is to locate the first detector within three feet of the peak. This proximity protects the apex region and provides prompt alarm activation as smoke begins to accumulate at the highest point. After that initial detector, spacing follows the rest of the ceiling’s layout according to the applicable coverage rules.

On peaked ceilings, the highest point is where smoke and heat tend to reach first and can move along the ceiling, so early detection must cover that apex area. Placing the first detector within a short horizontal distance from the peak ensures smoke is detected quickly before it spreads down the slope. The distance is measured horizontally to keep a consistent standard regardless of how steep the ceiling is, since measuring along the slope would give a misleading sense of how close the detector is to the apex.

So the best approach is to locate the first detector within three feet of the peak. This proximity protects the apex region and provides prompt alarm activation as smoke begins to accumulate at the highest point. After that initial detector, spacing follows the rest of the ceiling’s layout according to the applicable coverage rules.