ASTTBC RFPT — Fire Alarm Systems (AL) · Question
If a short circuit occurs on a Class B (DCLB) addressable loop without isolation modules, what impact does it have?
DCLB (Data Communication Link Class B) does not require a return to the panel. However, S524 requires isolation such that a single short circuit shall not disab
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Question: If a short circuit occurs on a Class B (DCLB) addressable loop without isolation modules, what impact does it have?
Answer options:
- The entire building is disabled.
- The devices only lose synchronization. ✅ Devices on that specific segment are lost; others continue to work.
- The panel automatically switches to Class A mode.
Correct answer: Devices on that specific segment are lost; others continue to work.
Explanation: DCLB (Data Communication Link Class B) does not require a return to the panel. However, S524 requires isolation such that a single short circuit shall not disable more than one 'zone' or a specific number of devices.
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Question explanations
- Which of the following constitutes a system 'deficiency' rather than a 'non-conformance' to current standards?
- When a deficiency is corrected, what specific information MUST be recorded in the log?
- Which of the following would be categorized as a 'Non-Conformance' to the Installation Standard (S524) in an i
- In the event of a deficiency that renders the fire alarm system inoperative, what is the mandatory reporting r
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