Notification Appliance Synchronization: To forestall confusion all through an emergency, NFPA 72 stipulates that notification appliances in the identical space ought to be synchronized to create a dependable and intelligible notify signal. Flip off the ability at your fuse box or purchaser unit. Consider care to turn off all circuits https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/