Interconnected fire alarms are an essential safety measure. They connect all fire alarms within a building so that when one alarm goes off, they all go off. This gives additional safety because those in a location not yet endangered by flames are still warned; if the fire alarms weren’t interconnected, the building occupants would not be notified of a fire until it was near enough to set the local fire alarm off. It also prevents people from endangering themselves to warn others of the flames.