In aClass Afire alarm circuit, asingle opencondition does not affect communication but must still be annunciated as atroublesignal.
NFPA 72 (2022), Section 12.3.1.1.1.4:
“A single open condition on a Class A pathway shall result in a trouble signal.”
This maintains system operation while alerting of a wiring fault.
Correct answer: D. Trouble
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