Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
35 Cards in this Set
- Front
- Back
A Fire Alarm System consists of three things; |
1. Initiating Devices 2. Notification Appliances 3. Fire Alarm Control Panel |
|
Standard for National Fire Alarm Code
|
NFPA 72
|
|
Brain of the system, linking the activation devices to the notification devices.
|
Control Panel
|
|
Manages and Monitors the proper operation of the system, indicates the source of an alarm, notification of the fire department, monitors faults in the system,
|
Control Panel
|
|
The Control Panel also manages the ___________ and ____________ power supplies.
|
primary and secondary
|
|
Primary Source usually _____-volt Secondary source ___________. |
10 battery |
|
Used to silent and reset the alarm. - ________ __________.
Always _________ ____ _______ before the system is reset. |
Control Panel
verify no fire |
|
The Control Panel controls building features, such as _________ and __________ ___________.
|
HVAC, sprinkler systems.
|
|
Control Panels may have Remote _____________
Additional display panels separate from control panel located ________ _____ ________. |
Annunciators
near the door |
|
An automatic or manually operated device that, when activated, causes the system to indicate an alarm.
|
Initiating Devices
|
|
An audible and visual device that alerts building occupants when the system is activated.
|
Notification Devices
|
|
Fire Alarm System Components (3)
|
1. Control Panel
2. Initiating Devices 3. Notification Devices |
|
Devices that detect or initiate the receipt of an alarm.
|
Initiating Devices
|
|
Manual Initiating Devices are located no more than _______ feet travel distance.
|
200 ft
|
|
Require a person to pull down a lever, toggle, or handle to activate the alarm.
_______ ________ causes the alarm to activate. |
Single-Action Pull Stations
One motion |
|
Require a person to perform two steps before the alarm will activate.
Reduces false alarms resulting from accidental initiation. |
Double-Action Pull Station
(ie; push in, THEN pull down) |
|
i. A replaceable slender glass rod that breaks when the handle on the manual pull station is pulled.
ii. Pulling lever provided requires force to _________ _____ ________.
iii. Serves as a _________ to malicious nuisance alarms. |
i. Breakglass Pull Station
ii. break the glass
iii. deterrent |
|
i. Clear plastic cover over pull station that activates a local alarm when lifted.
ii. Reduces ____________ alarms. |
i. Tamper Alarms
ii. malicious |
|
Manual Initiating Devices (4)
|
1. Single-Action Pull Station
2. Double-Action Pull Station 3. Breakglass Pull Station 4. Tamper Alarms |
|
Automatic Initiating Devices (6)
|
1. Smoke Detectors
2. Heat Detectors 3. Flame Detectors 4. Spark / Ember Detectors 5. Pressure Sensing Fire Detectors 6. Gas Detectors |
|
Smoke Detectors (4) |
1. Photoelectric Light Scattering Smoke Detectors 2. Photoelectric Light Obscuration Smoke Detectors 3. Linear Beam Smoke Detectors 4. Ionization Smoke Detectors |
|
Project light from a light source to a sensor. Smoke particles of sufficient density create the required change in transmission.
|
Photoelectric Light Scattering Smoke Detectors
|
|
Uses LED and a light sensor that does not receive light under normal conditions.
Light reaches the sensor when it is reflected by smoke particles. |
Photoelectric Light Scattering Smoke Detectors
|
|
Good at detecting smoldering fires and smoke from fires in spaces remote from the detector.
|
Photoelectric Light Scattering Smoke Detectors
|
|
Same as Light Scattering, except the light sensor is placed directly in the beam.
Smoke interferes with light transmission and the light received by the sensor decreases, causing an alarm. |
Photoelectric Light Obscuration Smoke Detectors
|
|
Desired in places where spot type detectors may be difficult to maintain and test, or where stratification is possible.
Consists of a sender and receiver. |
Linear Beam Smoke Detector
|
|
Sender transmits an infrared light beam to the receiver.
Smoke obscures the light beyond predetermined levels and alarm is activated. |
Linear Beam Smoke Detector
|
|
Good at detecting very small particles from a relatively clean burning or flaming fire.
|
Ionization Smoke Detectors
|
|
Contains small radioactive source inside a chamber that ionizes the air between a positive and a negative electrode.
|
Ionization Smoke Detectors
|
|
Smoke enters the chamber and neutralizes the charged particles, thus interrupting the charge between electrodes.
|
Ionization Smoke Detectors
|
|
Not used for life safety because they do not react fast enough to incipient fires.
|
Heat Detectors
|
|
Used in areas where smoke detectors cannot be used, such as dusty areas or environments affected by extreme warm or cold.
|
Heat Detectors
|
|
Less prone to false alarms than smoke detectors. Spot type heat detectors cover a specific floor area.
|
Heat Detectors
|
|
Single Station ________ ________ can be used in attics or storage rooms.
|
heat detectors
|
|
Heat Detectors (4)
|
1. Rate-of-Rise Heat Detectors
2. Fixed Temperature Heat Detectors 3. Rate Compensated Heat Detectors 4. Line Heat Detectors |