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Be sure to connect grounding lead to the GND terminal. Cautions: 1. Connect this to a 24V AC class 2 power supply only. 2. To prevent fire or shock hazard, the UL listed wire VW-1, style 1007 should be used for the cable for AC 24V Input Terminal. ELC (Electronic Light Control) In this mode a continuously variable electronic shutter is employed to automatically control exposure times in the CCD Image Sensor, according to the incoming light level. With this mode selected, fixed or manual ir