To connect a distribution box to a vertical shaft, ensure proper alignment, secure busbar connections, and follow grounding and wiring standards for safe and reliable power distribution.

Structural Installation

1. Positioning and Alignment: Install the distribution box firmly and horizontally, ensuring vertical deviation does not exceed 3mm. The box should be flush with the wall or shaft surface, with no gaps, and edges coated with anti-corrosion paint if metal is used .
2. Mounting: For embedded installations, fill the space between the box and the wall or shaft with concrete to secure it. For free-standing or modular setups, use bolts and pressing plates to attach the box to the vertical shaft frame .

Busbar Connection

1. Vertical Busbar Integration: The vertical bus (distribution bus) is typically housed in the bus compartment of the distribution box. Connect the distribution box's internal busbars to the vertical shaft bus using copper busbars of appropriate sectional area (e.g., 30×10 mm, 40×10 mm, or 60×10 mm) and secure with bolts .
2. Main Busbar Alignment: Ensure the main busbar of the distribution box aligns with the vertical shaft busbar. Depending on the design, the busbar can be single, series, or parallel connected. Double-layer main bus systems may require connections on both upper and lower floors of the box .

Electrical Wiring

1. Incoming Lines: Use a five-wire system for three-phase power: three-phase lines (A, B, C), neutral (N), and ground (PE). Connect the incoming lines to the appropriate terminals, such as air switches or circuit breakers .
2. Outgoing Lines: Connect outgoing circuits according to load requirements. For 220V loads, use one phase, neutral, and ground. For 380V three-phase loads, connect all three phases plus ground, and neutral if local control is needed .
3. Grounding: Ensure the metal shell of the distribution box is reliably grounded to the neutral or protective earth. All busbars and conductors should have proper insulation and protective sleeves where they exit the panel .

Safety and Compliance

• Verify all connections visually and with a multimeter before powering on.
• Label all circuits and busbars clearly for maintenance and future upgrades.
• Follow local electrical codes (NEC, IEC, or regional standards) and use certified components . By following these steps, the distribution box will be securely connected to the vertical shaft, ensuring both mechanical stability and safe electrical operation.