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Acceptance Tests – Tests designed to prove a smoke control system is capable of doing what is
designed to do.
AHJ – The “Authority Having Jurisdiction” is the organization, office, or individual responsible
for approving equipment, an installation, or a procedure.
Alarm Service – The service required following the receipt of an alarm signal.
Alarm Signal – A signal indicating an emergency requiring immediate action, as an alarm for fire
from a manual box, a waterflow alarm, an alarm from an automatic fire alarm system, or other
emergency signal.
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 fire.
Annunciator – A unit containing two or more identified targets or indicator lamps in which each
target or lamp indicates the circuit, condition, or location to be annunciated.
Auxiliarized Local System – A local system that is connected to the municipal alarm facilities.
Auxiliarized Proprietary System – A proprietary system that is connected to the municipal alarm
facilities.
Auxiliary Protective Signaling System – A connection to the municipal fire alarm system to
transmit an alarm of fire to the municipal communications center. Fire alarms from an auxiliary
alarm system are received at the municipal communications center on the same equipment and by
the same alerting methods as alarms transmitted from municipal fire alarm boxes located on
streets.
Auxiliary Trip Relay – A relay used to operate a municipal master box from an auxiliarized
control panel.
Bell, Single Stroke – A bell whose gong is struck only once each time operating energy is applied.
Bell, Vibrating – A bell that rings continuously as long as operating power is applied.
Box (or Station), Fire Alarm – (1) Non-coded. A manually operated device that, when operated,
closes or opens one or more sets of contacts and generally locks the contacts in the operated
position until the box is reset. (2) Coded. A manually operated device in which the act of pulling a
lever causes the transmission of not less than three rounds of coded alarm signals. Similar to the
non-coded type, except that instead of a manually operated switch, a mechanism to rotate a code
wheel is utilized. Rotation of the code wheel, in turn, causes an electrical circuit to be alternately
opened and closed, or closed and opened, thus surrounding a coded alarm that identifies the
location of the box. The code wheel is cut for the individual code to be transmitted by the device
and can operate by clockwork or by an electric motor. Clockwork transmitters can be pre-wound
or can be wound by the pulling of the alarm lever. Usually the box is designed to repeat its code
four times and automatically come to rest. Pre-wound transmitters must sound a trouble signal
when they required rewinding. Solid state electronic coding devices are also used in conjunction
with the fire alarm control unit to produce coded sounding of the audible signaling appliances.
Break-glass Box (or Station) – A break-glass box is one in which it is necessary to break a
special element in order to operate the box.
Continued on next page
Glossary of Terms
Glossary
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