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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

Under CAN/ULC-S527, what is the requirement for the 'Power On' indicator when the system is operating solely on standby batteries?

Section 5.3.4.1 of S527 defines the requirement for the visual 'Power On' indicator. It must be green and stay on as long as any power (AC or DC) is present and

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Question: Under CAN/ULC-S527, what is the requirement for the 'Power On' indicator when the system is operating solely on standby batteries?

Answer options:

  • It must flash until the AC returns ✅ It must remain illuminated provided power is available to the system
  • It must turn red to show battery use
  • It should be extinguished to save battery power during outages

Correct answer: It must remain illuminated provided power is available to the system

Explanation: Section 5.3.4.1 of S527 defines the requirement for the visual 'Power On' indicator. It must be green and stay on as long as any power (AC or DC) is present and the system is operational.

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