Its a really big fire and you need to stand clear
automatic fire alarm
Firefighters call a large fire a 'three alarm' fire.
Fire Alarm
Notification Appliance Circuit
if there is a fire or if the fire alarm is raised evrybody meets at the assembly point
It means - Rescue, Activate alarm, Confine the fire, Evacuate/Extinguish.
The fire alarm rang
Three different fire engine companies (or fire stations) receive the call to go fight that one fire. Usually that means its one really, really big fire. The above is partially correct, but still incorrect. A multi-alarm fire is given its' alarm number (one-alarm, two-alarm, etc) based on the number of "units" and firefighters present at the fire. Here in Kern County, two engine companies may respond, and the fire may still be classified a one-alarm fire. I have dispatched 2 engine companies (7 units, 23 firefighters) to a warehouse fire, that was coded a three-alarm fire. Not every city or county uses this method of multi-alarms. It is however, the most widely used system. Other factors also play into the multi-alarm system. Such as firefighters needing relief from exhaustion, the fire spreading to other buildings/structures, or the fire simply being to big to contain with the resources available at the fires' location. These will almost always result in more engine companies being called in to assist, thus raising the multi-alarm code to the next level, or higher.
The fire alarm technician is in charge of the installation of fire alarm systems. Fire alarm systems include addressable or conventional alarm control panels, smoke detectors, heat detectors, manual button alarms, sirens and strobes, signs, etc. A professional fire alarm system is large with professional addressable bus lines alarm systems, addressable detectors for building fire security, or other special field fire security. So, the fire alarm technician should be knowledgeable in alarm systems working principles and installation.
The Fire Alarm was created on 1936-03-09.
IF you mean '...see fire...' - The GOLDEN rule is - Raise the alarm, get everyone out, and call the fire brigade.
R: remove people A: activate alarm C: control fire E: exit/ extinguish fire