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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

If a fire alarm system is in 'Alarm Silence' mode, what must the control unit do if a second alarm is triggered from a different zone?

CAN/ULC-S527 mandates that the silencing of an alarm signal must not prevent the re-activation of the audible signal upon a subsequent alarm from a different zo

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Question: If a fire alarm system is in 'Alarm Silence' mode, what must the control unit do if a second alarm is triggered from a different zone?

Answer options:

  • Inhibit any further alarms until reset
  • Only silence the local buzzer but keep horns active ✅ Permit the subsequent alarm from another zone to sound the notification appliances
  • Automatically reset the system after 10 minutes

Correct answer: Permit the subsequent alarm from another zone to sound the notification appliances

Explanation: CAN/ULC-S527 mandates that the silencing of an alarm signal must not prevent the re-activation of the audible signal upon a subsequent alarm from a different zone.

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