Diagram of wiring method for distribution box

Wire the distribution box by connecting the main supply to the main MCB, then through the RCCB to individual output MCBs, ensuring proper neutral and earth connections.Step-by-Step Wiring Procedure1. Identify the Power Source: Locate the incoming single-phase supply (phase and neutral) from the utility or meter. Ensure the power is turned off before starting any wiring to prevent electric shock. 2. Connect the Main MCB: The incoming phase and neutral wires are connected to the double-pole Main MCB, which acts as the main switch for the distribution box. This MCB controls the overall power supply to the system and provides overcurrent protection. Typically, a 63A MCB is used for domestic installations in a 230V system (or 110–120V in the US) . 3. Install the RCCB (Residual Current Circuit Breaker): The output of the Main MCB is connected to the input of the RCCB. The RCCB protects against leakage currents, electrical shocks, and insulation faults. For domestic setups, a 30mA rated RCCB is commonly used. The RCCB output then feeds the individual MCBs . 4. Connect Output MCBs:Single-pole MCBs are used for standard loads such as lighting and sockets.Double-pole MCBs may be used for special or high-power loads. The output of the RCCB is connected to the input terminals of these MCBs. Each MCB then distributes power to its respective circuit . 5. Neutral and Earth Connections:Connect all neutral wires from the output circuits to the neutral bus bar.Connect all earth wires to the earth bus bar, including the incoming supply earth. Proper grounding ensures safety and prevents electric shock . 6. Verify Wiring Against the Diagram:Follow the schematic diagram to ensure each circuit is correctly connected.Check that the phase, neutral, and earth wires are routed properly and that no wires are loose or crossed.Confirm that the MCBs and RCCB are rated appropriately for the connected loads . 7. Safety Checks:Ensure all connections are tight and insulated.Test the RCCB and MCBs using a multimeter or test button to verify correct operation.Only turn on the main supply after confirming all connections are correct and safe . By following this method, the distribution box will safely distribute electricity to all circuits while providing protection against overloads, short circuits, and leakage currents. Always consult a licensed electrician if unsure about any step.