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NOTE: This is an unformatted excerpt from our online fire protection training library.

Supervisory Initiating Devices

Summary

Sprinkler System Supervision

SUPERVISORY SIGNALS are those signals that indicate an "off normal" condition in some other monitored fire protection or life safety system. A SUPERVISORY INITIATING DEVICE is a fire alarm system component that originates transmission of a signal indicating an off normal condition in a fire protection or life safety system, or other building function or process monitored by the building fire alarm system.

The most common supervisory initiating device is a valve supervisory switch designed to assure that sprinkler and fire protection water supply valves are open. Critical valves in other fire suppression systems may also be supervised.

Building temperature supervisory switches are used to monitor the temperature in areas where sprinkler piping is subject to freezing if building heat is lost.

Pressure switches are used as supervisory initiating devices to monitor the readiness of dry-pipe sprinkler systems. If the air pressure in the system varies more than 10 psi from normal, a supervisory signal is initiated.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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