Alarm Systems, Smoke Alarms Flashcards
What’s he difference between an alarm signal and a trouble signal ?
Trouble signal indicates and electrical fault within circuit, alarm signal sounds alarm
List a disadvantage of an ionization smoke detector
Over sensitive to humidity and cooking
What 2 wiring connections are required for smoke alarms in new installations?
Must be interconnected
Wired permanently into house
What are three types of zone loops in a residential alarm system?
Normally open
Normally closed
Monitored
What are the two categories of intrusion devices?
Perimeter devices
Intrusion devices
What is a perimeter device?
Used to sense an intruder while still on the outside of a home.
Magnetic reed, door and window contacts, window screen contacts, break glass detectors.
What is an internal device?
Internal devices are used to detect an intruder in the interior of a home.
Two types of smoke alarms?
Ionization detectors
Photoelectric detectors
What are two advantages of photoelectric smoke alarms?
They are fast to respond to slow smouldering fires and white or grey smoke
They are less probe to nuisance tripping
Smoke alarms are to be installed…
On each storey of each dwelling unit
In a hallways outside of sleeping rooms
On or near ceiling
If not in sleeping room within 5 m of door
What are the 4 conditions of a fire alarm system?
Normal condition
Trouble condition
Alarm condition
Supervisory condition
What are the three components of a basic fire alarm system?
A fire alarm control unit to provide the logic processing system
A manual pull station
An audible signal device to alert all the occupants of a building that they must evacuate
What is a class b circuit?
One continuous path connecting all field devices together terminating with an end of line (EOL) device such as a resistor
A fire alarm system must consist of a minimum of 3 main parts….
CPU
Initiating device
Signalling device
