CFAA Fire Alarm Technician · Question
In a Class A initiating device circuit, what occurs if there is a single wire break (open)?
Per CAN/ULC-S524, a Class A circuit must report a trouble signal for a single open but continue to operate all devices.
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Question: In a Class A initiating device circuit, what occurs if there is a single wire break (open)?
Answer options:
- The circuit remains normal; no trouble signal ✅ A trouble signal is generated; all devices remain functional
- A trouble signal is generated; devices after the break fail
- The fuse blows to protect the panel
Correct answer: A trouble signal is generated; all devices remain functional
Explanation: Per CAN/ULC-S524, a Class A circuit must report a trouble signal for a single open but continue to operate all devices.
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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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