Specifications

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APPENDIX-I: 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 panels, 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 panel to verify alarms originated by
smoke detectors before indicating an alarm.
Annunciator. A remotely located, electrically powered display, separate from the control
panel, 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 - FirePrint™. An intelligent fire detector that blends photoelectric, thermal and neural
network technologies for superior protection without false alarms.
Detector - Smoke, Photoelectric Type. A detector employing the photoelectric principle of
reflection or obstruction of light by smoke.
Detector - Thermal Type. An addressable thermal sensor that is programmable as either a
fixed temperature (135° F) or as a rate of rise detector.
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.