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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 10:25 a.m. on a Tuesday morning and a contract plumbing employee was working on replacement of a domestic water line. He installed new piping on the interior of the building and was ready to disconnect the old water line and tie in the new line. He walked outside and found a water supply valve on a line leading into the building. Believing it to be the domestic water system, he shut the valve. Unknown to him, the valve controlled the automatic sprinkler system and closure of the valve impaired the fire protection for the building. Fortunately, as soon as he began to close the sprinkler valve, a switch on the valve was actuated, sending a signal to the building fire alarm control unit. The security guard in the lobby heard the signal, checked the fire alarm control unit, and saw that a sprinkler valve was being closed. He immediately contacted the plant engineer and dispatched another security guard to the valve location. The sprinkler valve was quickly reopened, restoring fire protection to the facility.

The switch on the sprinkler control valve that transmitted a signal to the building fire alarm control panel is a supervisory initiating device.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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