For which of these should a fire alarm system conduct a trouble signal?

The choice indicating "Bypass mode" as a situation where a fire alarm system conducts a trouble signal is significant because bypassing components within a fire alarm system can indicate a potential issue that could compromise the system's intended functionality. When a system or a specific circuit is in bypass mode, it is not monitoring or responding to fire conditions due to the temporary exclusion of that component from the normal operational state. This change could lead to undetected hazards, making it essential for the system to alert operators that certain sensors or circuits are not active.

In contrast, while system failure, power outage, and alarm conditions all represent critical statuses within a fire alarm system, they are handled differently. A system failure and a power outage typically signify complete or partial inability of the system to operate, which might trigger distinct alerts rather than a general trouble signal. An alarm condition signifies that a potential fire event has been detected and requires action, rather than indicating a problem with the system itself. The bypass mode serves as a direct warning that the system may not function as expected, thereby assuring that operators are informed of any changes in monitoring capabilities.