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How to connect the main cable to the distribution box

Fiber and communications infrastructure knowledge brief Published 25 Dec 2025

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

To connect the main cable to a distribution box, first ensure the power is off, then connect the incoming live, neutral, and earth wires to the main terminals, followed by proper connection to circuit breakers and protective devices.

Safety First

Before starting, turn off the main power supply to prevent electrical shock. Use insulated tools and wear protective gloves. Ensure the distribution box is securely mounted on a stable surface at an accessible height and that the installation area is free of obstructions.

Step-by-

Step Connection

Identify the Main Cable WiresLive (Phase) wire: Usually brown or redNeutral wire: Usually blue or blackEarth wire: Green/yellow stripedConnect to the Main TerminalAttach the live wire to the input terminal of the main MCB (Double Pole MCB). Connect the neutral wire to the neutral bus bar. Connect the earth wire to the earth bus bar or link.

Install Circuit Breakers

Place the MCBs and RCCBs in their designated slots. Connect the output of the main MCB to the input of the RCCB.

From the RCC

B, connect the outputs to the individual load MCBs. For single-pole MCBs, connect only the phase wire; for double-pole MCBs, connect both phase and neutral.

Connect Load Circuits

Connect the phase terminal of each load to the output of the corresponding MCB. Connect the neutral terminal to the neutral bus bar. Connect the earth wire to the earth bus bar.

Ensure all wires are properly stripped, crimped, or tightened for secure contact.

Check and Test

Arrange wires neatly, secure with zip ties, and leave space for heat dissipation. Use a multimeter to verify continuity and ensure there are no short circuits. Test each circuit by switching on the MCBs and checking the load operation.

Additional Tips

Always use MCBs and RCCBs rated for your load. Ensure all exposed wires are insulated to prevent shorts. For outdoor or damp locations, use a waterproof distribution box.

Follow the wiring diagram specific to your distribution box model for accurate connections. By following these steps, the main cable will be safely and correctly connected to the distribution box, ensuring reliable power distribution to all circuits.

How to connect the main cable to the distribution box - METRA FIBER MARKET [PDF]

How to connect the main cable to the distribution box
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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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