If you want to learn about fire alarm try the following links:
1. System Sensors "Training" Page:
http://www.systemsensor.com/training
2. Society of Fire Protection Engineers (SFPE) Magazine On Line:
http://www.fpemag.com/. Take a look through the publications and your sure to find some interesting stuff. The last several issues have articles related for fire alarm sponsored by NEMA.
3. Go to NEMA's Web site (
http://www.nema.org/) and type in the term "Fire Alarm" in the Google Search bar. You'll have to pay for most of these publications and some are duplicates of what's available at System Sensor.
4. Try going to some of the various manufacturers of Audible equipment such as Wheelock (
http://www.wheelockinc.com/), System Sensor (as mentioned above), and Hochiki (
http://hochiki.specialbrand.net/).
I deal with Industrial and International Applications and unfortunately most of the manufacturers I work with don't publish much information for learning about "General Fire" alarm issues. If you look through the System Sensor site, you'll see where they have classes on NFPA 72, held through out the country. Not sure if they charge for them, but I've sent several sales people to the classes as they're not too technical.
Good Luck,
Regards,
Dan.