The Solution to Motion Sensor Controlled Landscape Lighting

Question: I’m trying to figure out the electrical wiring for a motion sensor that would control a 12 volt landscape lighting system.

1. I believe red wire will go to one of the wires to the light fixture
2. The white wire will go to the other wire from the light fixture,
3. Then where does the black wire go?

Somewhere on the transformer?

This electrical question came from: Matt, a Homeowner from Mound MN

Dave’s Reply:
Thanks for your electrical question Matt.

Electrical Wiring for a Motion Sensor Controlled Landscape Lighting System

• A 12 volt landscape lighting system cannot be directly connected to a 120 volt system without using a relay because the required watts of the landscape light power supply exceeds that of the motion sensor limitations.
• So basically if you try to wire this as you are describing you will burn up the motion sensor.
• Using a relay will make this work if it is designed properly.
• The key here is IF it is designed properly.

The Solution to Motion Controlled Landscape Lighting
I can assist you with this design by providing a custom wiring diagram, however I will need more specific information about your exact landscape lighting.

The Following links will assist you with your electrical question:

• Motion detector heads can be purchased and added to existing fixtures that have the appropriate fixture adapter cover.
• If you wish, you can build your own fixture just by selecting the compatible parts from your hardware store.
• Make sure all the parts are rated for exterior use.

 

Install a Motion Detector Head to a Light Fixture

• This section will cover how relays are constructed and operate due to the current flowing through the control coil
• The mechanical reaction that takes place.

Electrical Relay Construction and Purpose

Lighting Electrical Codes

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Electrical Wiring

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