Yellow green and red lights on the distribution box

Yellow, green, and red lights are connected to the distribution box using the three-phase lines (A, B, C), neutral (N), and protective earth (PE) according to their function and safety standards.

Wiring Overview

Phase Lines (Three-Phase Power)Yellow (A phase), Green (B phase), Red (C phase) are the three-phase lines coming from the main or secondary distribution box. These lines are connected to the input terminals of the indicator lights or through a shunt disconnector if monitoring multiple circuits.

Neutral Line

The light blue wire represents the neutral (N) line. Connect the neutral wire to the N terminal of the light or the leakage protector before connecting to the light. Protective Earth (PE)The yellow-green wire is the protective earth.

Connect it to the PE terminal of the distribution box to ensure safety and prevent electrical shock.

Light Function and Connection

Red Light: Indicates a fault or alarm. Steady red signals a major fault (short circuit or overload), while blinking red indicates a minor fault (loose connection),. Yellow Light: Indicates a warning.

Steady yellow shows low voltage, and blinking yellow signals temporary abnormalities or voltage fluctuations. Green Light: Indicates normal operation. Steady green means stable power, and slow blinking green indicates standby mode.

Connection Steps

Identify the phase line corresponding to each light: yellow, green, and red. Connect each phase line to the input terminal of the respective indicator light. Connect the neutral (blue) wire to the neutral terminal of the light.

Connect the P

E (yellow-green) wire to the protective earth terminal. Ensure that the PE line does not pass through the leakage protector, as this can cause unintended tripping. Secure all wires with proper insulation and use braided soft copper wire to connect the distribution box door to the PE terminal for safety.

Safety Precautions

Always turn off the main power before wiring. Use appropriate wire gauge according to the load (e.g., 2. 5mm² for lighting circuits),.

Bind wires neatly with plastic ties and maintain uniform spacing to prevent short circuits. After wiring, perform a safety inspection to ensure no loose connections or overload risks. By following these steps, the yellow, green, and red lights will correctly indicate the status of the distribution box, providing clear visual feedback for normal operation, warnings, and faults.