CFAA Fire Alarm Technician · Question
Which wiring classification allows for the continued operation of all devices on a circuit in the event of a single open-circuit fault?
Class A wiring provides a redundant return path to the panel, allowing it to function despite a single open. CAN/ULC-S524 §3.1.1.1.
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Question: Which wiring classification allows for the continued operation of all devices on a circuit in the event of a single open-circuit fault?
Answer options:
- Class B
- T-Tapped Class B ✅ Class A
- Non-supervised
Correct answer: Class A
Explanation: Class A wiring provides a redundant return path to the panel, allowing it to function despite a single open. CAN/ULC-S524 §3.1.1.1.
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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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