Electrical Level 4 Module 5 "Fire Alarm Systems"
At minimum hearing distance, an audible alarm should be no louder than
120dBA
Power-limited fire alarm circuit conductors must be separated from nonpower-limited fire alarm circuit conductors by at least
2" (50 mm)
Primary power circuits supplying fire alarm systems must be protected by circuit breakers not larger than
20A
Public area audible notification devices must have a minimum dBA rating of
75 at 10' (3 m)
Fire warning system units for residential use must be listed in accordance with UL standard
985
Which kind of detector can sense along its entire length?
A line detector
The use of an attendant signal requires the approval of the
AHJ
An automatic detector that draws air from the protected area back to the detector is called an
Air sampling detector
Which of the following fires will an IR detector NOT be able to sense?
Alcohol
Many fire alarm systems provide graphical control through an
Alphanumeric Keypad
Which electrical code specifies wiring methods and cables for fire alarm systems?
Article 760
For smoke chamber definition purposes, an archway that extends down 18" (450 mm) or more from the ceiling is considered the same as a
Barrier
Which fire alarm system is the simplest of all systems?
Conventional hardwired
In a supervised automatic sprinkler system, a visual or audible supervisory signal must be
Different from an alarm signal
An SLC that consists of a class A main trunk with a class B spur circuit is known as an SLC
hybrid circuit
The primary function of a commercial duct smoke detector is to
Shut down an associated HVAC system
What part of a fire alarm system coordinates the actions that the system must take in response to its other components?
The FACP
The ADA specifies that fire alarm strobe lights must be clear or
White
A defined area within the boundaries of a fire alarm system is known as a
Zone
Digital communicators connect to telephone lines with an
RJ31-X
A heat detector that is NOT a fixed-temperature device is a
Rate-of-rise detector
Commercial fire alarm cables that run from floor to floor must be rated at least as
Riser cable
The type of pull station that is restricted for use in special applications is the
Key-operated type
What is the first step in troubleshooting fire alarm equipment?
Know the equipment.
NFPA 101 is also known as the
Life Safety Code
Older type duct detectors used the
Light obscuration principle
Which organization establishes standards for equipment?
NEMA
A code that was established to help fire authorities continually develop safeguards against fire hazards is
NFPA 1
The specific requirements for wiring and wiring equipment installation for fire protective signaling systems are covered in
NFPA 72
Which of the following is an unacceptable means of mounting a detector on gypsum drywall?
Plastic masonry anchors
Addressable systems commonly use a verification method called
Positive alarm sequence
An alarm delay can be up to
Three minutes
The NFPA 72 specified Temporal-Three sound pattern for a fire alarm signal is
Three short (1/2 second), a pause, then a repeat
Duct smoke detectors are governed by
UL 268A
