Which statement about trouble signals is true?

• A. They require a separate power source
• B. They can share power with the fire alarm panel
• C. They do not require power
• D. They are optional in most systems

Answer: (A)

Trouble signals are there to alert you that something about the fire alarm system itself isn’t functioning properly, not to warn of a fire. For that alert to be reliable, the signal must have power that isn’t dependent on the main system’s power path. A separate power source—typically an auxiliary supply or a dedicated circuit/battery—keeps the trouble indication active even if the primary panel loses power or experiences a fault. So, providing a separate power source ensures the trouble condition is visible and actionable for maintenance. Power is still required for signaling, so it can’t be “no power,” and sharing power with the fire alarm panel could mask or fail during faults, which is why that option isn’t correct. Trouble signaling is not optional in typical systems; it’s a standard feature that supports ongoing system reliability.