Pir-Motion Sensor wiring diagram
Learn how to wire a motion sensor in a security light with a clear diagram, step-by-step installation, working principle, and testing guide for safe setup.
motion sensor light installation diagram
Security light wiring has a motion sensor that links the supply line to the PIR sensor input, the sensor output to the light, and the neutral wire directly to both. This enables the light to automatically turn ON when motion is detected.
how to wire a motion sensor light
A security light wiring diagram shows you how to set up a PIR motion sensor and a light to work automatically. This circuit is mostly utilized in home doors, gardens, staircases, garages, and offices to save power and protect against burglars. The output of the supply ends at a phase (line) which is terminated at the input of the motion sensor. Sensor output is attached to the security light phase input. The supply neutral is wired directly to the light and (where necessary) the motion sensor. The sensor starts the light when there is some movement in it. After no movement is detected, a preset delay is given and the light goes off. When installed properly, it is safe and convenient and uses less energy.
Work / Installation (Inputs → Outputs)
The working principle of a motion sensor light is simple:
- Input: Line (phase) and neutral supply.
- Output: Security light connected through the PIR sensor.
Installation steps:
- Connect the phase (line) wire from the supply to the sensor’s input terminal (L).
- Connect the sensor’s output terminal to the phase terminal of the security light.
- Connect the neutral (N) wire from the supply directly to both the sensor and the light.
- Connect the earth/ground wire to the light’s body for safety.
- Adjust sensor settings (sensitivity, delay time, and lux level).
When motion is detected within the sensor’s range, it provides output to the light, switching it ON. After no motion is detected, the light automatically turns OFF.
Testing and Final Adjustments
Once wiring has been completed, switch the supply off and reinspect all connections. Ensure that the line is connected to the sensor input, the sensor output to the light, and the neutral is also connected. When it is confirmed, switch ON the power supply. By placing it in front of the motion sensor, test the setup. The security light must be ON immediately. You can use the delay timer to adjust the duration of the light on when you are no longer moving. Tune the sensitivity knob to the distance to be detected and the lux setting to determine whether the light would work in the day or only at night. Make sure that wires are covered and clamped. Test again, at varying times (day/night) and angles to ensure it is working correctly.
Frequently Asked Questions - Pir-Motion Sensor wiring diagram:
What is a motion sensor in security light wiring?
It is a connection of a PIR sensor with a light to switch it ON automatically when motion is detected.
Which type of sensor is used in security lights?
A PIR (Passive Infrared) motion sensor is commonly used.
Where should a motion sensor security light be installed?
It should be installed near entrances, staircases, corridors, garages, or gardens.
What is the input connection for the sensor?
The line (phase) wire from supply connects to the sensor input terminal.
How is the light connected in this wiring?
The sensor output terminal connects to the phase input of the security light.
Does the neutral wire connect to the sensor?
Yes, neutral is connected directly to both the sensor and the light.
Can the security light be used without a ground wire?
It is not recommended; grounding ensures safety against electric shock.
What happens if no motion is detected?
The light turns OFF after the preset time delay expires.
Can the sensitivity of a motion sensor be adjusted?
Yes, most PIR sensors have a knob to set sensitivity and range.
Is motion sensor light wiring safe for beginners?
Yes, if proper precautions are taken such as turning OFF the supply during installation.
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