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Obscuration

The reduction in the atmospheric transparency caused by smoke or dust, expressed as a percentage.

On-Auto-Off Switch

A 3-position control panel switch used to select the manual or automatic operation of a motor, fan, or other appliance.

Open Fault

An abnormal circuit series resistance increase resulting in a trouble condition at the control panel.

Output

A signal generated to control external devices such as signals, relays, LEDs, control modules, etc.

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