CFAA Fire Alarm Technician · Question
In a conventional Class B circuit, the control panel monitors the integrity of the circuit by measuring:
Standard supervision involves a small DC supervisory current. If the circuit is broken, the current stops, and the panel senses the "Open" condition. CAN/ULC-S5
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Question: In a conventional Class B circuit, the control panel monitors the integrity of the circuit by measuring:
Answer options:
- Voltage drop ✅ Supervisory current flow
- Resistance to ground
- Capacitance of the wire
Correct answer: Supervisory current flow
Explanation: Standard supervision involves a small DC supervisory current. If the circuit is broken, the current stops, and the panel senses the "Open" condition. CAN/ULC-S524.
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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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