Connect a terminal box to a flange by first mechanically securing the box to a flat, reinforced surface, then making the electrical connections while ensuring no mechanical load falls on the cables.

Mechanical Connection

1. Prepare the Mounting Surface: Ensure the transformer, switchboard, or equipment surface is flat and reinforced to support the weight of the terminal box or flange assembly .
2. Cutouts and Fixtures: Prepare any required cutouts and ensure fixtures are in place to mechanically secure the terminal box .
3. Attach the Flange: Align the flange with the terminal box or adapter section. Bolt the flange securely, ensuring proper mating with the terminal box or air terminal chamber .
4. Weight Management: The weight of the terminal box must be supported by the mounting surface, not by the electrical connections. Use lifting or transporting equipment if necessary .
5. Sealing and Protection: Apply sealant if needed to achieve the desired degree of protection (e.g., IP55 or higher) and attach the cover plate to the enclosure .

Electrical Connection

1. Cable Preparation: Route power cables carefully, ensuring they are mechanically fixed and free from stress or bending that could damage connections .
2. Connect to Busbars or Circuit Breakers: After mechanical securing, connect the terminal box to the busbar, circuit breaker, or other electrical components .
3. Check Compatibility: Ensure the operating temperatures and conductor specifications match the terminal box and flange ratings .
4. Final Inspection: Verify that all connections are tight, properly insulated, and that no mechanical load is applied to the electrical cables .

Additional Considerations

• Flange Types: Full-length or partial-length flanges can be used depending on the application, providing interfaces for bus ducts or transition sections .
• Modifications: Any additional drilled holes or attachments should comply with manufacturer instructions and safety standards .
• Documentation: Record the installation details, including torque values, sealant usage, and cable routing, for future maintenance . Following these steps ensures a secure, safe, and compliant connection between the terminal box and flange, minimizing the risk of mechanical or electrical failure.