Appendix A-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
current-limited devices, typically 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.
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 or grounded 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.
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 pre-selected 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.
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. The control panel
may also provide transfer of power to the notification appliances and
transfer of conditions to relays or devices connected to the control
panel.
Fire/Supervisory: An IDC point type that is zone selectable. This
point type will initiate a “Supervisory Abnormal” condition at the
FACP if a current-limited state is detected and a Fire Alarm condition if
a shorted state is detected.
Continued on next page
Appendix A
Glossary of Terms
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