5-1
Alarm - A warning of fire danger.
Alarm Signal - A signal indicating an emergency requiring immediate action,
such as a signal indicative of fire.
Alarm Verification - A feature to reduce unwanted alarms wherein smoke
detectors must report alarm conditions for a minimum period of time. Alarm
Verification also confirms alarm conditions within a given time period, after
being reset to be accepted as a valid alarm initiation signal.
Annunciator - A unit containing two or more indicating lamps, alpha-numeric
displays, or other equivalent means in which each indication provides status
information about a circuit, condition or location.
Authority Having Jurisdiction - The “Authority Having Jurisdiction” is the
organization, office or individual responsible for approving equipment, an
installation, or a procedure.
Class A - A four-wire method of connecting IDC or NAC that guarantees
operation with a single open conductor. See Style D (IDC) and Style Z (NAC).
Class B - A two-wire method of connecting IDC or NAC that causes a trouble
indication with an open circuit. See Style B (IDC) and Style Y (NAC).
Current-Limited IDC State - A “current-limited” state exists when an initiating
device shunts a resistor across the IDC. For the 4004 system, this resistor is
defined as 400-820 ohms.
Digital Alarm Communicator Transmitter (DACT) - A system component at
the protected premises to which initiating devices or groups of devices are
connected. The DACT seizes the connected telephone line, dials a pre-selected
number to connect to a Digital Alarm Communicator Receiver (DACR), and
transmit signals indicating a status change of the initiating device.
Display - The visual representation of output data other than printed copy.
Evacuation - The withdrawal of occupants from a building.
Evacuation Signal - A distinctive signal intended to be recognized by the
occupants as requiring evacuation of the building.
FACP - Fire Alarm Control Panel. A system component that receives input
from automatic and manual fire alarm devices and may supply power to
detection devices and transponders or off-premises transmitters. The control
panel can provide transfer of power to the notification appliances and transfer of
conditions to relays or devices connected to the control panel. The FACP can be
a local fire alarm control panel or a master control panel.
Fire/Supervisory - An IDC point type that is zone selectable. This point type
initiates a “Supervisory Abnormal” condition at the FACP if a current-limited
state is detected.
Heat Detector - A device that detects abnormally high temperature or rate of
temperature rise.
Continued on next page
Chapter 5
Glossary of Terms
Glossary of Terms
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