Fire Alarm Signal Circuit

Alarm supervisory trouble opens and grounds on a fire alarm circuit will result in a blank signal.

Fire alarm signal circuit.

9 6 3 6 the general evacuation alarm signal shall operate in accordance with one of the methods prescribed by 9 6 3 6 1 through 9 6 3 6 3. The signaling line circuit is used by the main computer fire alarm control panel or facp to communicate with all the sub computers detectors and modules. 9 6 3 6 1 the general evacuation alarm signal shall operate throughout the entire building. The total current draw for all the devices connected to the circuit cannot exceed the nac rating.

In the wireless fire alarm system a radio signal is transmitted from the detector such as heat detector or call point to the central fire alarm system to activate the alarm circuit. If an open additional troubles may also be queued that relate to the failure of one or more active field devices from communicating their condition with the common control. 9 6 fire detection alarm and communications systems. Each nac notification appliance circuit in a fire alarm panel or booster power supply has a maximum current rating.

Initially all appliances were either electromechanical horns or electric bells which would later be replaced by electronic sounders. The data sent from the facp to the detectors and modules carries information like address and polling and sometimes programming. Trouble supervisory and alarm. Trouble signal a trouble signal is typically designated by a yellow light and means that there is an operational issue.

Fire alarm circuit classes 2007 nfpa 72 6 4 2 1 class. There are three basic categories for fire alarm panel signals. Signal circuit nac on a fire alarm panel. A condition which may be caused by an interruption of the data communication link or signalling line circuit caused by either an open circuit short circuit or device failure.

A circuit where automatic or manual initiating devices are connected and the signal does not identify the individual device operated. Performance shall be based upon wiring class note the old class style has been replaced with class only alarms must activate nacs and control circuits within 10 seconds. This information can be found in the manuals provided with the panels. 9 6 fire detection alarm and communications systems.

Audible appliances have been in use longer than any other method of notification. For some more advanced systems the panel may indicate the kind of problem and where it is located. A notification appliance may use audible visible or other stimuli to alert the occupants of a fire or other emergency condition requiring action.