Fire Alarm Flashcards
What is the primary purpose of a fire alarm system
To save lives
What is the secondary purpose of a fire alarm system?
To protect property and initiate fire fighting
What are the four stages of a fire
Incipient stage
Smoldering stage
Flame stage
Heat stage
What is a class A fire
Ordinary combustibles (wood, paper, rags)
What is a class B fire?
Flammable liquids and gases (natural gas, gasoline)
What is a class C fire?
Electrical (short circuits, overloaded cables)
What is a class D fire
Combustible metals (sodium, titanium, magnesium, plutonium)
What is a class K fire
A cooking fire. Liquids used in food preparation
What are the three components of a fire triangle?
Heat, fuel, and oxygen
What are the four conditions of a fire alarm system
Normal
Trouble
Fire alarm
Supervisory Alarm
What are the two types of fire alarm systems?
Single stage system
Two stage system
How much time must elapse before a two stage system will automatically initiate the second stage
5 minutes
What does FACP stand for?
Fire alarm control panel
What are the three types of fire alarm systems?
Conventional
Multiplex
Addressable intelligent
What does an isolation module do?
Isolates a portion of the DCL circuit
What are control/relay modules used for?
Used to control ancillary devices
How many devices do most addressable systems allow per DCL?
Approximately 100
What does DCL stand for?
Data Communication Link
What does SLC stand for?
Signalling Line Circuit
Is a DCL polarity sensitive?
Yes
What are some examples of Alarm Initiating Devices?
Detectors, pull stations, flow switch
What are some examples of notification devices?
Bells, horns, strobes
What are some examples of ancillary devices?
Door mags, HVAC, elevators,
What are two types of smoke detectors
Photoelectric and ionization
Which type of smoke detector would cause less nuisance ringing near a kitchen?
Photoelectric
What are the two major types of heat detectors?
Rate of Rise and Fixed temperature
What must a rate of Rise detector sense in order to go off?
A 15 degree/minute increase in temperature
What is the standard fire alarm system sound called? Describe it
Temporal 3. Three half second tones, a pause, and then repeat
What are two types of sprinkler systems?
Wet and dry
What are the three sprinkler tree devices?
Gate valve tamper switch
Flow switch
Low pressure switch
