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Initiating Device - A system component that originates transmission of a change
of state condition, such as a smoke detector, manual fire alarm box, supervisory
switch, etc.
Initiating Device Circuit (IDC) - A circuit to which automatic or manual
initiating devices are connected where the signal received does not identify the
individual device operated.
Labeled - Equipment or materials to which has been attached a label, symbol, or
other identifying mark of an organization acceptable to the “Authority Having
Jurisdiction” and concerned with product evaluation, that maintains periodic
inspection of production labeled equipment of materials and by whose labeling
the manufacturer indicates compliance with appropriate standards or
performance in a specified manner.
Listed - Equipment or materials included in a list published by an organization
acceptable to the “Authority Having Jurisdiction” and concerned with product
evaluation, that maintains periodic inspection of production of listed equipment
or materials and whose listing states either the equipment or material meets
appropriate standards or has been tested and found suitable for use in a specified
manner.
March Time Code - A notification code that consists of a 50% duty cycle pulse
train. The march time rate is specified in beats per minute (BPM). A 20 BPM
March Time Code consists of 20 ON/OFF cycles in one minute.
Municipal Master Box - An indicating device intended to send an alarm
condition to the public fire service communication center.
Normal State (IDC) - The normal state is defined as the end of line resistor in
place with the full range of line resistance and detector load.
Notification Appliance - A fire alarm system component such as a bell, horn,
strobe, etc., that provides an audible or visible output, or both.
Notification Appliance Circuit (NAC) - A circuit or path directly connected to
one or more notification appliances.
Open Circuit State (IDC) - An open circuit is defined as the absence of the
end-of-line resistor, with or without a detector load.
Protected Premises - The physical location protected by a fire alarm system.
Remote Station Circuit - A circuit intended to send alarm, supervisory, and/or
trouble signals to a remote location at which appropriate action is taken.
Short Circuit IDC State - A short circuit exists when an initiating device shunts
a low resistance contact across the IDC. The contact resistance is defined as
0-200 ohms.
Simple Code - A code consisting of a distinct number of pulses used to indicate
which zone (IDC) is in alarm. The number of pulses is the same as the number
assigned to the zone in alarm.
Smoke Detector - A device that detects visible or invisible particles of
combustion.
Continued on next page
Glossary of Terms (Continued)
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