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Proprietary Protective Signaling System – An installation of protective signaling systems that
serve contiguous and noncontiguous properties under one ownership from a central supervising
station located at the protected property, where trained, competent personnel are in constant
attendance. This includes the central supervising station, power supplies, signal-initiating devices,
initiating device circuits, signal notification appliances, equipment for the automatic, permanent
visual recording of signals, and equipment for the operation of emergency building control
services.
Protective Signaling Systems – Electrically operated circuits, instruments, and devices, together
with the necessary electrical energy, designed to transmit alarm, supervisory, and trouble signals
necessary for the protection of life and property.
Rectifier – An electrical device without moving parts that changes alternating current to direct
current.
Remote Station Protective Signaling System – An installation using supervised dedicated
circuits, installed to transmit alarm, supervisory, and trouble signals from one or more protected
premises to a remote location at which appropriate action is taken.
Repeater Facility – Equipment needed to relay signals between the protected premises and the
central supervising action.
Reverse Stack Effect – Downward movement of air within the building.
RUI – Remote Unit Interface communications
SLC – Signaling Line Circuit (Path). A circuit or path (channel or trunk and leg) over which
multiple signals are transmitted and received.
Smoke Barriers – Barriers that prevent smoke from passing through them.
Smoke Control System – A system that employs motorized fans to create air pressure differences
and positive or negative airflows to limit and control the movement of smoke and other noxious
gases. Provides safe zones and tolerable conditions along exit routes but can do little to control
fire.
Smoke Control Zones – A zone must be separated from other zones by smoke dampers, airtight
doors, and smoke-proof barriers.
Smoke Damper – (1)A damper that prevents smoke from passing through when fully closed.
(2) Dampers that meet the requirements given in UL 555S, Standard for Leakage Rated Dampers
for Use in Smoke Controls Systems. (3) In a smoke control system, the damper must be fitted with
the end-position switches to provide feedback to the smoke control system.
Smoke Detector – A device that detects visible or invisible particles of combustion.
Spacing – A horizontal measured dimension relating to the allowable coverage of fire detectors.
Stairtower – A stairwell with a ventilation system that is located from the main building.
Supervision Service – The service required to monitor performance of guard patrols and the
operative condition of automatic sprinkler system and of other systems for the protection life and
property.
Supervision – The term supervised refers to monitoring of the circuit, switch, or device in such a
manner that a trouble signal is received when a fault that would prevent normal operation of the
system occurs.
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Glossary of Terms, Continued
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