C-1
This appendix contains a glossary of common terms used throughout the manual.
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, or confirm
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 (AHJ) - 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 will cause 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.
Device Type - See Hardware Device Type.
Digital Alarm Communicator Transmitter (DACT) - A system component at
the protected premises to which initiating devices or groups of devices are
connected. The DACT will seize the connected telephone line, dial a preselected
number to connect to a 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.
Continued on next page
Appendix C
Glossary of Terms
Overview
Glossary
Glossar
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