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

Supervisory Initiating Devices

Introduction

Supervisory Initiating Devices

It was 10:15 p.m. on Friday night when a utility company substation transformer, over loaded because of increased electrical demand during arctic cold weather, shorted and exploded. The explosion knocked out power to a wide area, including a local industrial plant. Without electrical power, the industrial plant was without heat. The temperature in the facility began to drop. At 32°F the water in the sprinkler and domestic water systems would freeze and burst the pipes. The temperature inside the facility continued to drop until, at 40°F, a temperature sensor actuated, sending a signal to the building fire alarm control unit and to a central station alarm company. The central station operator contacted the plant engineer and the maintenance supervisor at their homes. They went to the plant and took action to prevent the sprinkler and domestic water lines from freezing.

The temperature sensor that actuated when the temperature dropped to 40°F is a supervisory initiating device.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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