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Assembly Diagram of Secondary Distribution Box

Fibre interconnection and data room reference Published 02 Nov 2024

Use this reference to prepare product questions for FD SOLUCIONES. Check interfaces, capacity, protection and installation requirements against the current product documentation.

A secondary distribution box is assembled by sequentially installing the main switch, protective devices, busbars, neutral and earth bars, and routing outgoing circuits according to a structured internal layout.

Internal Layout

A typical secondary distribution box contains the following key components arranged for safety, accessibility, and efficient wiring: Incoming Main Switch/Isolator: Controls the supply to the entire box. Surge Protective Device (SPD): Protects against voltage spikes. Phase Busbars: Distribute live power to outgoing circuits.

Neutral Bar: Collects neutral connections from all circuits. Earth Bar: Provides grounding for safety. MCBs/RCCBs/RCBOs: Protect individual circuits from overloads and faults.

Outgoing Circuits: Connected to the busbars and routed to loads.

Cable Entry Points and DI

N Rails: Facilitate organized wiring and mounting of modular devices (Figure adapted from ). CodeCopyIncoming Supply L N PE | +--------------------+ | | v v+----------------+ +--------------+| Main Switch | | Earth Bar PE |+----------------+ +--------------+ | | v v+--------------+ +--------------+| Phase Busbar | | Neutral Bar |+--------------+ +--------------+ | | v v +----+----+----+ Outgoing Circuits | MCB | MCB | MCB | +----+----+----+ Step-by-Step Assembly MethodPrepare the Enclosure: Ensure the box is clean, free of debris, and properly mounted or supported.

Install the Main Switch/

Isolator: Secure the main switch at the top or designated position for easy access. Mount Busbars: Install phase busbars, neutral bar, and earth bar according to the layout, ensuring proper spacing and insulation. Install Protective Devices: Mount MCBs, RCCBs, RCBOs, and SPD modules on DIN rails or brackets.

Route Wiring Channels: Use cable ducts or channels to organize incoming and outgoing wires, maintaining separation between live, neutral, and earth conductors. Connect Incoming Supply: Wire the main switch to the incoming L, N, and PE lines. Connect Outgoing Circuits: Wire each MCB or protective device to its respective outgoing load circuit.

Check Grounding and Bonding: Ensure all earth connections are properly bonded to the enclosure and earth bar. Perform Safety Checks: Verify insulation, torque on terminals, and correct polarity. Final Inspection and Testing: Test continuity, insulation resistance, and functionality of protective devices before energizing the box (assembly workflow reference ).

Best Practices

Maintain clear labeling for all circuits and devices. Ensure adequate spacing for heat dissipation. Follow local electrical codes (IEC 61439, IEC 60898, or regional standards).

Use modular components for easier maintenance and future expansion. Keep wiring neat and organized to reduce fault risk and simplify troubleshooting. This method ensures a safe, efficient, and code-compliant assembly of a secondary distribution box, minimizing installation errors and facilitating maintenance.

Assembly Diagram of Secondary Distribution Box - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Assembly Diagram of Secondary Distribution Box

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