I see in the news like second and third alarm fire alarms, I’m not from the USA, so I have no experience (that I’m aware of) of different alarm fires
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Alarm refers to response package or what type of units and how many are are going to a fire based on department rules. Ex. Operating procedure states that five engines, a ladder truck, rescue, and three chiefs is for a multifamily residential fire.
Command on scene can add additional “alarms” or response packages depending on severity of fire. Say it’s a big fire and they need more resources, they can call for another alarm aka response package.
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