The main distribution board (MDB) receives power from the utility supply and distributes it to various sub-circuits or switch boxes through protective devices such as MCBs (Miniature Circuit Breakers), RCDs (Residual Current Devices), and busbars . A switch box is a smaller unit that controls specific loads like lights or sockets in a room or area .
To connect a main distribution box to a switch box, run phase, neutral, and earth wires from the MDB through appropriate protective devices to the switch box. The phase wire connects to the switches, the neutral wire to the neutral busbar, and the earth wire to the earth terminals. Proper MCBs and RCDs should be installed to protect circuits and users, and all wiring should comply with safety standards and load requirements .
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