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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

What is the maximum allowable spacing between spot-type smoke detectors on a smooth, flat ceiling?

Standard spot-type smoke detectors have a maximum spacing of 9m (30ft) under ideal flat ceiling conditions. For heat detectors, it varies but 9m for smoke is th

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Question: What is the maximum allowable spacing between spot-type smoke detectors on a smooth, flat ceiling?

Answer options:

  • 5 m
  • 12 m
  • 15 m ✅ 9 m

Correct answer: 9 m

Explanation: Standard spot-type smoke detectors have a maximum spacing of 9m (30ft) under ideal flat ceiling conditions. For heat detectors, it varies but 9m for smoke is the baseline in S524.

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