Fire Alarm Control Panel 28
Fire Alarm Control Panel 28 : Panel Alerting: (5) Prealarm: This LED is often used in conjunction with a two-stage system, in which the panel requires two devices to be activated (and/or a predetermined time limit to run out after one device is activated) in order to go into full alarm. This is mostly used in areas where false alarms are a common problem, or in large applications (such as hospitals) where evacuating the entire building would not be efficient. The prealarm LED is lit when one device has tripped. The prealarm LED may also be used if an analog smoke detector registers low levels of smoke in the detection chamber, but not enough to trigger a full alarm. Depending on the system's layout, the NAC's may or may not activate for prealarm conditions. In a two-stage system, the NAC's are typically coded to a special first-stage coding, or in some situations where a loud alarm signal could be disruptive, chimes will activate. If there is a voice evacuation system, it will usually instruct building occupants to await further instructions while the alarm is being investigated
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