12530/12540 OWNER'S MANUAL
P/N 447203 Issue I XII-1
XII. APPENDIX-E: GLOSSARY
Alarm Signal. A signal indicating an emergency requiring immediate action, such as an alarm for fire
from a manual station, a waterflow alarm, or an automatic smoke detector.
Alarm Silence Inhibit. An option that prevents a human operator from silencing the notification
appliances for a preset period of time.
Alarm System. A combination of compatible initiating devices, control units, and notification appliances
designed and installed to produce an alarm signal in the event of a fire.
Alarm Verification. A preset option that causes the control unit to verify alarms originated by smoke
detectors before indicating an alarm.
Annunciator. A remotely located, electrically powered display, separate from the control unit, containing
LEDs or lamps to indicate the states of the fire alarm system.
Audible Signal. An audible signal is a sound made by one or more audible notification appliances, such
as bells or horns, in response to the operation of an initiating device.
Authority Having Jurisdiction (AHJ). The organization, office, or individual responsible for approving
equipment, installation or procedure.
Auto-Silence. The capability of a control to automatically silence the notification appliances after a
preset period of time.
Auxiliary Relays. Control relays that energize only during alarm conditions that are used to either apply
power to or remove power from other equipment during an alarm condition.
Class A Circuit. An initiating device or notification appliance circuit within which all components remain
fully functional, even though a single open or ground exists in the circuit.
Class B Circuit. An initiating device or notification appliance circuit within which some or all components
may be disabled with a single open or ground exists in the circuit.
Detector - Smoke, Ionization Type. A detector employing the principle of smoke’s effect on an electrical
current flowing in an ionized air chamber.
Detector - Smoke, Photoelectric Type. A detector employing the photoelectric principle of reflection or
obstruction of light by smoke.
End Of Line (EOL). A device used to terminate a supervised circuit.
General Alarm. A term usually applied to the simultaneous operation of all the notification appliances on
a system.
Ground Fault. A trouble condition in which a low resistance has been detected between the system
wiring and conduit ground.
Initiating Device. A manually or automatically operated device such as a manual pull station, smoke
detector, heat detector, waterflow switch or tamper switch.
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