Fire Alarm Flashcards
What are the 4 elements to a fire?
- fuel
- heat
- oxygen
- chemical chain reaction to above items
In fire fighting terms what is “Starvation?”
The process of depriving the fire of fuel, like combustible materials.
In fire fighting terms what is “Cooling?”
The process of depriving the fire of heat. For example, by applying water to a fire, you absorb the heat and reduce the temperature needed to support combustion.
In fire fighting terms what is “Smothering?”
The process of depriving the fire of oxygen
In fire fighting terms what is “Interference?”
The process of applying extinguishing agents, such as dry chemical, to stop the chemical chain reaction
What does Class A fire extinguisher fight?
Paper, Wood, Cloth, Ordinary combustibles
What does Class B fire extinguisher fight?
Flammable liquids such a diesel and gas
What does Class C fire extinguisher fight?
Energized Electrical Equipment fires
What does Class D fire extinguisher fight?
Metals such as magnesium, potassium, titanium
What does Class K fire extinguisher fight?
Cooking fires with oil and fat
What is water in a fire extinguisher good for fighting. How does it work?
Class A fires. Cooling
What is Foam in a fire extinguisher good for fighting. How does it work?
It separates oxygen from the other elements in the fire triangle by smothering the fire.
What is Carbon Dioxide in a fire extinguisher good for fighting. How does it work?
It removes the oxygen element and some heat with a very cold discharge. Generally, it is
effective on Class B and C fires, but not Class A fires.
What is Dry Powder in a fire extinguisher good for fighting. How does it work?
Interrupts the chemical chain reaction of the fire. The multipurpose dry chemical is the most widely used type of fire extinguisher and is effective on Class A, B, and C fires.
What is Wet Chemical in a fire extinguisher good for fighting. How does it work?
is a new agent that extinguishes the fire by removing the heat element and prevents re-ignition by creating a barrier between the oxygen and fuel elements. This type of extinguisher was developed for modern, high efficiency deep fat fryers in commercial cooking operations. Some may also be used on Class A fires in commercial kitchens.
The rating on the combination extinguisher is rated 4-A:80-B:C. What does this code mean?
The “A” rating is a water equivalency rating. Each “A” is equal to 1.25 gallons (4.73L)
of water. So 4A = 5 gallons (18.92L) of
water.
The “B:C” rating is equivalent to the amount of square footage that the extinguisher can
cover, handled by a professional. This extinguisher can cover 80 ft
The “C” rating never has a numeric value as it simply indicates that the chemicals inside
are non
-conductive
-suitable for use on energized electrical equipment
What does PASS method mean?
When using a fire extinguisher:
- Pull
- Aim
- Squeeze
- Sweep
What are the four stages to a fire?
- Incipient Stage
- Soldering (smoke) Stage
- Flame Stage
- Heat Stage
What is an IDC?
Initiating Device Circuit. Used to notify fire alarm panel that a fire sensing device (IE smoke detector) has triggered.
What is SDC?
Signalling Device Circuit. Alarm panel uses these to turn on bells and strobes etc.
What is FACU?
Fire Alarm Control Unit. The brains of the fire alarm system.
What are rules for Primary Power to Fire Alarm Control Unit (FACU?)
A fused circuit of 115V, 60 Hz located on the load side of the service and taken from as close to the incoming mains (meter) as is possible. A red painted fused disconnect or breaker labelled FIRE ALARM, able to be locked in the on-position, is required. [See CEC Rule 32-108 (1), (3)]
What are rules for Standby Power to Fire Alarm Control Unit (FACU?)
upon a loss of primary power lasting more than 15 seconds, the power source must be transferred to standby power. The FA system will immediately and automatically transfer back to the main power source upon its restoration. Standby power may be an emergency circuit from a generator or, more often, a battery bank found in the FA control unit itself. The standby power must be sized to provide supervisory (normal non-alarm) power for 24 hours, followed by full-load (alarm)
power for 5 minutes.
Where must the Annunciator Panel be located?
Building Front Entrance