CFAA Fire Alarm Technician · Question
Electromagnetic door holders must be designed such that upon loss of fire alarm power, they:
CAN/ULC-S524 requires that if the fire alarm system fails or its power is lost, the ancillary devices like door holders must transition to their 'emergency stat
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Question: Electromagnetic door holders must be designed such that upon loss of fire alarm power, they:
Answer options:
- Remain locked/energized indefinitely
- Wait for a manual override ✅ Fail to the 'fire safety' position (doors close)
- Sound a local trouble buzzer until fixed
Correct answer: Fail to the 'fire safety' position (doors close)
Explanation: CAN/ULC-S524 requires that if the fire alarm system fails or its power is lost, the ancillary devices like door holders must transition to their 'emergency state' (release the door).
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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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