Fire Alarm CH 2 Flashcards
signaling line circuits monitor for integrity by?
polling or interrogation of circuit
wiring between enclosures is not required to be monitored for integrity if the enclosures are less than 10 inches apart and the wiring is _________
installed in conduit
initiating device circuits and notification appliance circuits monitor for integrity by?
a small current through the circuit
list 3 examples of an installer who is “qualified and experienced” under the requirements of NFPA 72
Nicet certified
IMSA certified
Certified by state or local authority
Opens and grounds on a fire alarm circuit will result in a _______ signal.
trouble
if a system standby load is 350 milliampers and the alarm load is 1.100 amperes what is the required capacity of a battery used for a secondary power supply
10.19A
secondary power supplies must supply power to protected premises fire alarm systems for a minimum of?
24 hours of standby power followed by 5 min of alarm
the code requires the maximum normal operating temperatures for most fire alarm equipment to be between
32 and 120 degrees F
notification appliances commonly us a ______ to prevent monitoring current to pass through the notification appliance circuitry>
blocking diode
upon detection of a trouble condition, fire alarm systems controls must initiate a trouble signal within _________ seconds
200 seconds
conductors returning to the control unit from the last field device on the circuit might indicate?
Class A
which circuit class is considered as “fail-safe”?
class D
the disconnecting means (branch circuit) for the primary power of a fire alarm system must be _____ in color
red
Class ______ circuits are not required to be monitored for integrity
class E
where an engine-driven generator is used to provide secondary power a minimum of ______ hours of batteries are required. why?
4 hours in case generator does not start
Duct smoke detectors are sometimes permitted to cause a _________ signal in place of an alarm signal
supervisory
all devices on signaling line circuits have ____________.
unique addresses
secondary power supplies must supply power to an in -building fire emergency voice/alarm communications fare alarm system for a minimum of?
24 hours of standby followed by 15 min of alarm
an emergency communication system can be used to warn occupants of a _____, _______, or _______>
fire
terrorist attack
tornado
Fire alarm control equipment requires a smoke detector for protection when the controls are _______.
Located in an area that is not continuously occupied
wiring between enclosures is not required to be monitored for integrity if the enclosures are less than _______ apart and the wiring is installed in conduit
10 inches
section _______ of NFPA 72 requires all circuits to be monitored for integrity.
12.6
why is t-tapping not permitted on initiating device circuits, notification appliance circuits, and class a signalling line circuits?
not monitored for integrity.
a valve tamper switch, when actuated, will produce a ______ signal.
supervisory
list three signals produced by a fire alarm system.
alarm - GTFO
supervisory - something is off normal
trouble - something is wrong with the wire
alarm signals are indicative of a ______.
fire or other life threatening emergency.
which of the following documentation must be provided to the authority having jurisdiction at the completion of a fire alarm installation
record of completion
