CFAA Fire Alarm Technician · Question
When installing heat detectors on a ceiling with solid joists, how must the spacing be adjusted compared to a smooth ceiling?
S524 states that heat detectors have a reduced spacing requirement on joisted ceilings. The spacing is reduced by 50% in the direction perpendicular to the jois
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Question: When installing heat detectors on a ceiling with solid joists, how must the spacing be adjusted compared to a smooth ceiling?
Answer options:
- Increase by 10% ✅ Decrease by 50% in the direction at right angles to joists
- Remain the same as smooth ceilings
- Increase by 25% due to heat trapping
Correct answer: Decrease by 50% in the direction at right angles to joists
Explanation: S524 states that heat detectors have a reduced spacing requirement on joisted ceilings. The spacing is reduced by 50% in the direction perpendicular 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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