Connect the main supply to the main MCB, then wire the RCCB and individual circuit breakers, ensuring proper neutral and earth connections for safety.

Step-by-Step Connection Process

1. Safety First Always turn off the main power supply before starting any wiring to prevent electrical shock. Ensure the distribution box is securely mounted at an accessible height and the installation area is free of obstructions ( ). 2. Identify Input and Output

• The incoming live (phase) and neutral wires from the main supply are connected to the input terminals of the main MCB ( ).
• The main MCB acts as the primary switch and distributes power to the rest of the circuits. For domestic installations, a double-pole MCB is commonly used as the main switch ( ). 3. Connect the RCCB (if used)
• The output of the main MCB is connected to the input of the RCCB.
• The RCCB provides protection against leakage currents and is essential for safety in domestic wiring ( ). 4. Wiring Individual Circuit Breakers
• For single-pole MCBs, connect the phase wire from the RCCB output to the input of each MCB.
• For double-pole MCBs, connect both phase and neutral wires from the RCCB output to the MCB input ( ).
• Connect the output terminals of each MCB to the corresponding load (appliances, lighting, or outlets). 5. Neutral and Earth Connections
• Connect all neutral wires from the loads to the neutral link in the distribution box.
• Connect all earth wires from the loads, the metallic body of the box, and the supply earth to the earth link ( ).
• Ensure the earth wire from the earthing pit is also connected to the earth link for proper grounding. 6. Organize and Secure Wiring
• Route wires neatly: typically, incoming wires on the left and outgoing wires on the right.
• Use plastic ties to bind wires, keeping spacing uniform and wires straight ( ).
• Clearly mark wires for AC, DC, or different voltage levels to avoid confusion. 7. Testing and Inspection
• After completing the wiring, use a multimeter to verify connections, check for short circuits, and confirm proper grounding ( ).
• Perform a safety inspection to ensure there are no overloads or loose connections before turning on the main supply ( ). Following these steps ensures that the control wiring in your distribution box is safe, organized, and functional, providing reliable power distribution to all connected circuits.