CFAA Fire Alarm Technician · Question
How does a typical fire alarm panel monitor the integrity of a Notification Appliance Circuit (NAC) wire?
NACs use reverse polarity supervision. When in supervisory mode, the panel applies voltage in one direction (blocked by diodes in horns). In alarm, it reverses
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Question: How does a typical fire alarm panel monitor the integrity of a Notification Appliance Circuit (NAC) wire?
Answer options:
- Current monitoring through the solenoid ✅ Reverse polarity supervision
- Frequency modulation supervision
- Digital pulse encoding
Correct answer: Reverse polarity supervision
Explanation: NACs use reverse polarity supervision. When in supervisory mode, the panel applies voltage in one direction (blocked by diodes in horns). In alarm, it reverses polarity so appliances operate. CFAA Manual S1-Ch4.
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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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