CFAA Fire Alarm Technician · Question
What is the result of a single open-circuit fault on a Class B initiating device circuit?
Class B wiring does not return to the panel; devices beyond an open circuit are disconnected from the panel and will not activate. CAN/ULC-S524 §3.1.2.1.
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Question: What is the result of a single open-circuit fault on a Class B initiating device circuit?
Answer options: ✅ Devices beyond the open will not operate
- The panel will not show a trouble signal
- The circuit remains fully functional
- The circuit will immediately go into alarm
Correct answer: Devices beyond the open will not operate
Explanation: Class B wiring does not return to the panel; devices beyond an open circuit are disconnected from the panel and will not activate. CAN/ULC-S524 §3.1.2.1.
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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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