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MJ
Md Jony Islam
Last updated: Jun 10, 2026

Motion Sensor connection

Step-by-step wiring diagram of a motion sensor connected to a light circuit for automatic ON/OFF control based on detected movement.

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Motion Sensor

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Device that detects movement using infrared or ultrasonic signals

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Motion Sensor connection

Step-by-step wiring diagram of a motion sensor connected to a light circuit for automatic ON/OFF control based on detected movement.

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motion detector light wiring

The wiring of motion sensors simply involves linking the live, neutral and load cables of the motion sensor to power supply and the light bulb so that automatic control of the light is achieved when motion is detected.

Formula & Table Summary:

Line (Live) Input: Supplies power to the sensor.
Neutral: Completes the electrical circuit.
Load Output: Connects to the light fixture.
Earth (Ground): For safety grounding.
Operation: Sensor relay closes load circuit upon detecting motion, turns off after delay.

Terminal Connection Function
L (Live) Connects to Line/Live supply Powers sensor circuit
N (Neutral) Connects to Neutral wire Completes power circuit
Load Connects to light fixture Controls light ON/OFF
Earth (Ground) Connects to ground wire Safety protection
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motion activated lighting wiring

The motion sensor wiring diagram shows the connection between a motion sensor switch and a lighting load to have the light switch ON when it detects any motion and switch OFF after a set delay. The usual connection comprises of line (live), neutral, load to the lighting device, and an earthing point to the earth. The motion sensor is a relay-based device where its internal relay operatively manages the load circuit in accordance to infrared detection. Such an arrangement is highly popular in security lighting, corridors and outdoor settings to save energy or convenience. Appropriate connections and right attachment of terminals give efficient usage and security.

motion sensor connection

Motion Detected Sensor Relay Light Status Remarks
Yes Closed ON Light turns ON automatically
No Open OFF Light remains OFF
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Frequently Asked Questions - Motion Sensor connection:

Live, neutral, load, and earth wires are required.
Yes, with proper waterproof sensors.
Load terminal of sensor connects to light's live input.
Most modern sensors require neutral for power.
Yes, if total load is within sensor's rating.
Usually adjustable from 10 seconds to several minutes.
Yes, for safety and compliance.
Only if you have basic electrical knowledge.
Some sensors have pet immunity; check specifications.
Check wiring and sensor sensitivity settings.
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