In areas with more than two visual notification appliances, what is required?

In areas where more than two visual notification appliances are installed, synchronization is required to ensure that all devices flash together in a coordinated manner. This is critical for effectively attracting attention during an emergency event, as it helps to avoid confusion and enhances the overall effectiveness of the visual alerts.

When visual notification appliances are synchronized, they create a uniform alert pattern, which is especially important in environments that may have individuals with hearing impairments or in areas where the sound from audible alarms may be drowned out by background noise. Proper synchronization can also aid in maintaining the visibility of the alerts and ensures that occupants can quickly identify the direction of the alarm source or emergency.

While other requirements may apply to different scenarios, such as color or mounting height, the primary focus in this case is on synchronization for the purpose of effective notification during emergencies.