FDNY COF for Fire Alarm Systems Inspection, Testing and Service Technician (S-98) Practice Exam

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If multiple visible signaling appliances are in the same field of view, how must they operate relative to one another?

synchronized

When multiple visible signaling appliances are in the same field of view, they must flash together in unison. Synchronizing the strobes creates a single, cohesive visual alert people can quickly recognize, which reduces confusion and ensures the warning is noticed promptly. If they operated sequentially, randomly, or on alternating cycles, the visual signal would appear disjointed, making it harder to perceive as one alarm and potentially delaying response. Modern signaling devices are designed to synchronize so the entire area lights up at the same moment, reinforcing a clear, unified notification.

operated sequentially

independently with random timing

on alternating cycles