Audible dot com is the leading provider of downloadable digital audio books and spoken word entertainment. Audible has over one hundred thousand titles to choose from to be downloaded to your iPod or MP three player. Go to audible podcast dot com slash brain stuff to get a free audio book download of your choice when you sign up today. Welcome to Brainstuff from house staff Works dot com where smart Happens. Hi Am Marshall Brain with today's question. How
do smoke detectors intercommunicate with each other? Battery powered smoke detectors are standalone units, But if you have AC powered smoke detectors in your home, and your home has been built in the last ten years or so in the United States, chances are their wired together to intercommunicate. This sort of wiring guarantees that if one alarm in the house goes off, they all go off. Even if the fire starts down in the basement, people asleep upstairs will
hear the alarm. Because of this safety feature, every alarm in the house goes off simultaneously. If you buy an a C powered smoke detector today, it will have three wires, black white, and red black excepts volts. A C white is neutral, and red is the intercommunication wire. All of the alarms operate off the same circuit from the fuse box and are normally connected using normal wire. For three ways switches, see the article entitled how three ways switches
work on How stuff Works for details. This wiring contains a black, white and a red wire. In a romance casing, the electrician runs the red wire from alarm to alarm to interconnect them. When any alarm detects a fire, it sends a nine volts signal on that red wire. Any alarm that detects a nine volts signal on the red wire will begin sounding its alarm immediately. Most alarms can go about a dozen units intercommunicating on that same red wire. It's a very simple and a very effective system for
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