Notification Appliance Synchronization: To avoid confusion for the duration of an unexpected emergency, NFPA 72 stipulates that notification appliances in precisely the same place should be synchronized to supply a reliable and intelligible warn sign. The interlink wire can carry a live electrical present-day concerning alarms if they are powered https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/