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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

When installing heat detectors on a ceiling of solid joist construction, the distance between detectors shall not exceed:

CAN/ULC-S524 §11.2.1.2 requires the distance between heat detectors to be not more than 0.7 times the listed spacing for smooth ceilings when calculating for jo

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Question: When installing heat detectors on a ceiling of solid joist construction, the distance between detectors shall not exceed:

Answer options:

  • 1.0 times listed spacing ✅ 0.7 times listed spacing
  • 0.5 times listed spacing
  • 1.4 times listed spacing

Correct answer: 0.7 times listed spacing

Explanation: CAN/ULC-S524 §11.2.1.2 requires the distance between heat detectors to be not more than 0.7 times the listed spacing for smooth ceilings when calculating for joisted construction. (Logic: Reduced spacing due to air flow interference).

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