a complete information on how a fire alaram operates, it's principle & mechanism?

Question

importance, accessories,circuit description, operation and many more details

Answer 1

That's just a little more information than can be typed in a answer field on this site.

In simple terms, most fire alarm systems consist of a network of initiating and indicating devices that are controlled by a central control panel. Most newer systems are computer based and have an addressable control system which indentifies all of the initiaing devices on the system by a unique I.D. or "address".

Examples of initiating devices: Manual Pull Stations, Heat Detectors, Smoke Detectors, Waterflow switches, pressure switches, and addtional contact points for stuff like a fire pump running.

Examples of indicating devices: Bells, Chimes, Horns, Strobes, Beacons, and Speakers.

Circuits are all typically supervised in some fashion with either redundant wiring returning to the central panel or end-of-line resistors.

Although here are a few questions on the subject that link to some of what you asked...

http://answers.yahoo.com/question/;_ylt=Alc46z9OyeF1o0QHSkzw6FAjzKIX?qid=20060707150317AAX52vy

http://answers.yahoo.com/question/;_ylt=At8VntcJ3fUVuYIct3kd.ksjzKIX?qid=1006051014549

http://answers.yahoo.com/question/;_ylt=ApndL1uxM7YYJAEres5an1EjzKIX?qid=1006050311966

In the United States, fire alarm operation, principle, mechinism ans all that is outlined by NFPA 72 (The National Fire Alarm Code.)

I know that doesn't complete answer your question, but again, people teach entire courses on the subject, this isn't something that can just be broken down into one little "yahoo answer."

Answer 2

not exactly a specific question but i'll try.

there are a few different types of switch, one could have a thermometer type and react when the temp gets over its limit or it could have a thin strip of low melting point metal, such as solder across two charged points which would break the circuit then causing an alarm state.

some fire alarms can be battery powered and need changing and testing every so often, some can be mains powered and battery backed up, some are standalone alarms, ie they work independently of each other, some can be hardwired into a complete alarm system for the house/building along with smoke detectors elsewhere and either activate an external sounder or send a signal to an alarm receiving center saying "fire at this address" etc.

whew! hope that helps ya though.