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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

During the verification of a Class A DCL circuit, what is the required response when a single 'open' fault is introduced?

S537 (Verification) requires that for a Class A circuit, a physical break is introduced to confirm the panel can still 'see' all devices. A Class A circuit must

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Question: During the verification of a Class A DCL circuit, what is the required response when a single 'open' fault is introduced?

Answer options:

  • It must shut down to protect the processor.
  • It must sound the alarm immediately. ✅ It must indicate a trouble signal and acknowledge all devices on the loop.
  • It must disconnect the return path.

Correct answer: It must indicate a trouble signal and acknowledge all devices on the loop.

Explanation: S537 (Verification) requires that for a Class A circuit, a physical break is introduced to confirm the panel can still 'see' all devices. A Class A circuit must be able to report a trouble while maintaining device operation.

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