Fire Alarm Systems Flashcards
In an addressable system initiating devices are connected to the FACP through a line referred to as?
DCL (Data communication Link) or
SLC (Signalling Line Circuit)
In an addressable system, Modules are connected to the FACP through a line referred to as a
DCL OR SLC
In a conventional fire alarm circuit, the name of the small current that flows to indicate circuit integrity under normal conditions is called?
Supervisory current
The two types of fire alarm control units are?
Single stage and two stage
Relay modules are used for the control of?
Ancillary devices/ circuits
Examples of Ancillary devices are?
Magnetic door holders
Fan contractors
Fire pumps
What is the primary purpose of a Fire alarm circuit
To save lives!
Isolation modules are used to ?
Isolate a portion of the SLC (signalling line circuit)
4 conditions of a fire alarm system are?
Normal
Trouble
Supervisory
Alarm
Monitor modules are used to monitor?
Conventional devices/circuits
In a conventional fire alarm system, what is used to provide circuit supervision?
End of Line Resistor (EOL)
Conventional initiating circuits end with?
End of line resistors (EOL)
Conventional monitoring circuits end with?
End of Line Resistors (EOL)
A conventional fire alarm system does not provide identification of the specific device that initiated the alarm. What does it identify?
It will provide identification of the Zone (area) the initiating device is located
2 types of heat detectors are?
Fixed and Rate of rise
Conventional NAC circuits end with?
End of Line Resistors (EOL)
In addressable circuits what is polarity conscious?
All initiating and monitoring devices
A SLC (signalling line circuit) or a DCL (Data communication link doesn’t end with a ?
End Of Line Resistor
Addressable NAC circuits end with a?
End of line resistor
When a heat detector pull station or a smoke detector is activated in a single stage fire alarm system what will initiate?
Audible evacuation signal
On a two stage fire alarm system if 5 minutes pass and the signal has not been acknowledged what happens?
An alarm signal will activate
When a heat detector pull station or smoke detector is activated a two stage fire alarm system will initiate a?
Audible alert signal
When wiring a SLC or DCL what terminal do you leave on!
The B terminals
List 3 sprinkler tree devices and the conditions each device will initiate through the FACP?
Gate valve- supervisory
Low water pressure switch- supervisory
Water flow switch- ALARM
In an addressable system if a device address is wrong, what condition will be displayed?
Trouble
In a conventional fire alarm circuit what is polarity sensitive?
Smoke detectors and Notification devices
What can be used to de energize an ancillary device?
Addressable relay module
What can be used to interconnect a conventional device/ circuit to an addressable fire alarm system?
Addressable monitoring module
What style is a Class A system?
Style 6
What style is a class B system?
Style 4
What are the 5 classes of Fires?
Class A = ordinary combustibles
Class B= Flammable liquids
Class C= Electrical
Class D= Combustible metals
Class K= cooking fires
The 3 major types of fire alarm systems are?
Conventional
Multiplex
Addressable
What are some notification appliances?
Strobes, bells horns and speakers
What are some visual appliances?
Strobes would be the only visual
What are some initiating devices?
Smokes, pull stations, heat detectors
3 half tones a pause and then repeats is?
Temporal 3
Pressure switch has what kind of contacts?
N/C contacts. Uses pressure to open it
Flow switch uses what kind of contact!
N/O contact! When water flows it closes causing an alarm
What contact does the gate valve use?
N/C held open contact, when closed it sends a supervisory alarm to the FACP
What are NAC circuits?
Notification Appliance circuits
(Audible or Visual)
What are the color codes of resistors?
BBROYGBVGW GS and nothing
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Grey 8
White 9
Gold +/- 5%
Silver +/- 10%
No color = +/- 20%
What are two types of basic smoke detectors?
Photoelectric and ionization
Automatic devices are?
Heat and smoke detectors and The flow switch on the sprinkler tree
What are manual devices?
Pull stations either single or two stage
