How to connect the 135V power distribution box

To connect a 135V power distribution box, you must properly wire the main input to the main breaker, distribute power to branch circuits via MCBs or fuses, and ensure correct neutral and earth connections for safety.Step 1: PreparationInstall the distribution box securely on a wall or panel board. Ensure it is fixed and accessible for wiring and maintenance .Gather materials: circuit breakers (MCBs or DP/Single Pole), wires of appropriate gauge, wiring ties, fuses, and tools like wire strippers and screwdrivers .Determine wire specifications: For 135V circuits, select wire sizes according to load; typically 2.5mm² for lighting and sockets, 4mm² for higher loads like air conditioning .Step 2: Identify Input and OutputMain input: Connect the 135V supply lines (phase and neutral) to the main breaker (DP MCB if both phase and neutral are switched), .Branch circuits: Each output circuit should be connected to individual MCBs or fuses. Use a double-pole MCB for special loads requiring both phase and neutral switching .Step 3: Wiring SequencePhase wires: Connect the incoming phase wire to the input terminal of the main breaker. From the main breaker, connect to the input of the RCCB (if used) and then to the branch MCBs .Neutral wires: Connect the incoming neutral to the neutral bus bar. Branch circuit neutrals should also connect to this bus .Earth wires: Connect all earth wires from the supply and loads to the earth bus bar. Ensure the metallic body of the box is also earthed .Step 4: Wire Color CodingPhase wires: Use standard colors (e.g., red or brown for phase, blue for neutral, green/yellow for earth) to avoid confusion .Branch identification: Label each circuit clearly to indicate voltage, AC/DC, or specific load type .Step 5: Safety and BindingBind wires neatly with plastic ties to prevent tangling and ensure straight routing .Inline fuses: If using a power distribution block, install fuses for each branch to protect equipment from overloads .Check connections: Ensure all terminals are tight, no exposed conductors, and polarity is correct .Step 6: TestingPower-on test: After wiring, switch on the main breaker and test each branch circuit individually.Safety inspection: Verify there are no short circuits, overloads, or loose connections. Use a multimeter to check voltage at each output . Following these steps ensures that your 135V power distribution box is connected safely and efficiently, providing reliable power distribution to all connected circuits.