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en.wikipedia.org/wiki/Multiple-alarm_fire

Definition. A common misconception is that a "3-alarm fire," for example, means that three firehouses responded to the fire. This is not the rule behind the naming convention, although some cities may use the number of firehouses responding for multi-alarm designations because that is the simplest way to determine an alarm number.

www.courier-journal.com/story/news/local/2015/04/03/four...

Few people really know what it means when they hear about a six-alarm fire. And different fire departments have different guidelines. The Louisville Fire Department catagorizes the fires by the ...

www.reference.com/government-politics/seven-alarm-fire-666...

A seven-alarm fire is one in which the on-scene fire commander has asked for help seven times. Fires that require more than one truck or one company's response are known as multi-alarm fires. Each fire house has a typical format that includes a predetermined response for the initial fire call, known as the first alarm.

answers.yahoo.com/question/index?qid=20070103172533AAyG6OP

Best Answer: One more than five alarms. Different cities have different definitions of alarm response. A single alarm could mean a ladder company, an engine company, and a rescue company, as an example.

www.reference.com/government-politics/four-alarm-fire-mean...

A modern four-alarm fire refers to the number of units dispatched to the scene of a fire. Most major cities define a unit as a vehicle such as a fire truck, fuel truck, ladder truck, the department SUV or a civilian vehicle.

bizfluent.com/about-5232186-definition-3-alarm-fire.html

A 3-alarm fire is a very dangerous situation for the area, the people and the officials trying to extinguish it. Firefighters determine a 3-alarm blaze by the size and the severity of it. The firefighters then contact neighboring fire departments, news agencies and emergency personnel to inform them of how bad the ...

slate.com/.../2006/05/how-big-is-a-10-alarm-fire.html

In New York City, dispatchers send out 25 units and 106 firefighters for a two-alarm fire, 33 units and 138 firefighters for three alarms, 39 and 168 for four, and 44 and 198 for five.

en.wikipedia.org/wiki/Fire_alarm_system

A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present. These alarms may be activated automatically from smoke detectors, and heat detectors or may also be activated via manual fire alarm activation devices such as manual call points or pull stations.

localwiki.org/toronto/Toronto_Fire_Alarm_Levels

Toronto Fire Alarm Levels. Constructed in 1910, the old Adelaide Street Alarm office and HQ sat next to the old Adelaide Street fire hall at 152 Adelaide Street West. The station served as Toronto's fire headquarters until 1971. You hear the number of alarms all the time, but what exactly do these numbered alarms really mean? ...

www.theclassroom.com/what-are-the-different-degrees-of...

When a fire breaks out and someone reports it to a dispatcher, there are different fire alarm degrees that are sent out in order to make sure the right number of responders report to the fire. This can be anything from a one alarm fire, to a multiple alarm fire or even a five alarm fire.