CFAA Fire Alarm Technician · Question
When primary 120VAC power is lost, how must the fire alarm system transfer to battery power?
The secondary power supply must automatically take over when the primary supply fails. CAN/ULC-S524.
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Question: When primary 120VAC power is lost, how must the fire alarm system transfer to battery power?
Answer options:
- Manual switchover by building staff ✅ Automatic switchover upon primary power loss
- The system shuts down until manually reset
- A delay of 10 minutes is allowed before transfer
Correct answer: Automatic switchover upon primary power loss
Explanation: The secondary power supply must automatically take over when the primary supply fails. 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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