CFAA Fire Alarm Technician · Question
How does a standard non-addressable Fire Alarm Control Panel monitor the integrity of a Notification Appliance Circuit (NAC)?
The Polarized (DC) method uses a diode in each appliance. Reversing the polarity of the DC current allows the appliance to operate; in supervision mode (reverse
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Question: How does a standard non-addressable Fire Alarm Control Panel monitor the integrity of a Notification Appliance Circuit (NAC)?
Answer options:
- Using a Zener diode in parallel
- Using an addressable module for every horn ✅ Diode steering and reversing the DC polarity
- Measuring the inductance of the coil
Correct answer: Diode steering and reversing the DC polarity
Explanation: The Polarized (DC) method uses a diode in each appliance. Reversing the polarity of the DC current allows the appliance to operate; in supervision mode (reversed), current only flows through the End-of-Line resistor.
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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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