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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

According to the NBCC, what is the required capacity of the emergency power supply for a system with a voice communication system?

NBCC 3.2.4.7(4) specifies that the system must operate for 24 hours on standby, followed by 30 minutes under full alarm load for systems with voice communicatio

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Question: According to the NBCC, what is the required capacity of the emergency power supply for a system with a voice communication system?

Answer options:

  • 12 hours standby / 60 minutes alarm
  • 24 hours standby / 15 minutes alarm ✅ 24 hours standby / 30 minutes alarm
  • 48 hours standby / 5 minutes alarm

Correct answer: 24 hours standby / 30 minutes alarm

Explanation: NBCC 3.2.4.7(4) specifies that the system must operate for 24 hours on standby, followed by 30 minutes under full alarm load for systems with voice communication or complex requirements. Small systems use 5 mins. 30 mins is the required minimum for most RFPT-level commercial buildings. S536 testing matches these.

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