When placing spot type smoke detectors ___ ft shall be permitted to be used as a guide.

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Multiple Choice

When placing spot type smoke detectors ___ ft shall be permitted to be used as a guide.

Explanation:
Spot-type smoke detectors are mounted on ceilings to detect rising smoke quickly. Using 30 ft as the spacing guide ensures that no point in a room is more than about 30 ft from a detector, so smoke will reach a sensor promptly and the alarm will sound in time for occupants to react. Spacing them wider could create blind spots where smoke remains undetected longer, delaying warning. Making the gap smaller (like every 10 ft) would increase cost and installation effort without a proportional benefit. So, 30 ft is the practical, widely used guideline for placing spot-type detectors.

Spot-type smoke detectors are mounted on ceilings to detect rising smoke quickly. Using 30 ft as the spacing guide ensures that no point in a room is more than about 30 ft from a detector, so smoke will reach a sensor promptly and the alarm will sound in time for occupants to react. Spacing them wider could create blind spots where smoke remains undetected longer, delaying warning. Making the gap smaller (like every 10 ft) would increase cost and installation effort without a proportional benefit. So, 30 ft is the practical, widely used guideline for placing spot-type detectors.

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