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en.wikipedia.org/wiki/Multiple-alarm_fire

One-alarm, two-alarm, three-alarm fires, etc., are categories of fires indicating the level of response by local authorities. The term multiple-alarm is a quick way of indicating that a fire is severe and is difficult to contain.This system of classification is common in the United States and in Canada [citation needed] among both fire departments and news agencies.

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 ...

besthubris.com/life/what-is-a-3-alarm-fire

The term three-alarm fire simply means that 3 different sets of units were requested to handle a particular fire. In fact, it appears to be one of those terms repeatedly thrown around in the media because it is an official sounding term that carries a lot of “zip” for the average reader, despite having little meaning outside of the actual ...

www.answers.com/Q/What_does_a_three_alarm_fire_mean

Fire alarms generally sense things that are related to fire andactivate a warning system, either locally or remotely or both. There are three major types of fire alarm sensors, all of whichoperate ...

forums.radioreference.com/threads/what-does-3-alarm-fire-mean.54969

1 Alarm= One full assignment of companies for a fire 2 Alarm= Two full assignments 3 Alarm= Three full assignments It just is a reference to how many full assignments are sent to a fire.

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

There are several different degrees of fire alarms, and they are all based on how serious the fire is, how quickly responders can react to it and how many responders are needed to put out the fire. In general, there are one alarm fires, multiple alarm fires (up to a three fire alarm) and five alarm fires.

www.reference.com/.../four-alarm-fire-mean-8c921de3f276a09a

What Does "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. The exact number of dispatched units and firefighters on the scene varies from ...

sites.google.com/site/3alarmfiredefinition

3 Alarm Fire Definition : Led Car Alarm Lights. ISO 7240-1:2005 provides a set of general guidelines and definitions to be used in describing the fire detection and alarm system equipment, tests and requirements in the other parts of ISO 7240.

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

The precise meaning of an “alarm” varies depending on the fire department. In New York City, dispatchers send out 25 units and 106 firefighters for a two-alarm fire, 33 units and 138 ...

idioms.thefreedictionary.com/a+three-alarm+fire

1. A fire that is so large or intense that it requires the presence of many firefighting units to try to contain it. A three-alarm fire is the reason we heard all of those sirens last night