Appendix A-4
Style Z: A method of connecting notification appliances on NACs that
provide multiple signal paths so that circuit operation is maintained
with a single open circuit or ground connection. A trouble indication is
provided in the event of an open circuit on the wiring loop. Also
known as Class A.
Supervisory Signal: A signal indicating the need of action in
connection with the fire suppression system or equipment, or with the
maintenance features of related systems.
Temporal Code: A three-pulse coding pattern adopted by NFPA as a
standard evacuation pattern for audible notification. The pattern
consists of three 1/2-second pulses, each pulse separated by 1/2-second
silence. Each group of three pulses is separated by 1.5 seconds of
silence.
VSMOKE: A point type that is selectable for an IDC. This point type
will initiate an immediate alarm from a contact closure Pull Station or
Heat Detector, but will initiate the Alarm Verification sequence for a
current-limited alarm. A point configured as VSMOKE must not have
any devices other than smoke detectors that initiate a current-limited
alarm.
Zone: A defined area within the protected premises. A zone may
define an area from which a signal can be received, an area to which a
signal can be sent, or an area in which a form of control can be
executed.
Glossary of Terms, Continued
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