CFAA Fire Alarm Technician · Question
When installing smoke detectors on a ceiling with solid joists, what is the required reduction in spacing in the direction perpendicular to the joists?
Clause 5.7.3.3.1 states that for beamed ceilings where beams exceed 10% of ceiling height or are spaced more than 2.4m, specific spacing rules apply. For deeply
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Question: When installing smoke detectors on a ceiling with solid joists, what is the required reduction in spacing in the direction perpendicular to the joists?
Answer options:
- 25% ✅ 50%
- 66%
- 75%
Correct answer: 50%
Explanation: Clause 5.7.3.3.1 states that for beamed ceilings where beams exceed 10% of ceiling height or are spaced more than 2.4m, specific spacing rules apply. For deeply joisted ceilings, spacing is 50% of the listed spacing at right angles to the joists.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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