Wiring Photoelectric Switches

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Step 1

Identify whether the  circuit’s operating voltage type is AC or DC. The photoelectric switch used on a direct current circuit is different from the one used on an alternating current circuit.

Step 2

Check the voltage and current levels on the equipment labels to verify what size switch is needed. The voltage and current rating of the photoelectric switch should be higher than the rating of the equipment it will be turning on and off. Step 3 discusses how to connect a photoelectric switch designed for an AC circuit.

Step 3

Connect the black hot wire from the power source to one terminal of the photoelectric switch. Connect the second terminal of the photoelectric switch to the equipment using the correct gauge wire for the circuit. The equipment can be a light, electric motor, etc. Connect the white common wire of the power source directly to the second terminal of the equipment. This is for an AC circuit. Step 4 discusses how to connect a photoelectric switch designed for a DC circuit.

Step 4

Connect the black negative wire from the power source to the negative terminal of the photoelectric switch. Connect the positive terminal of the photoelectric switch to the negative terminal of the equipment. Connect the red positive wire of the power source directly to the positive terminal of the equipment. This is for an DC circuit.

Step 5

Test the circuit under “light” and “no light” conditions.

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