How long should the cable tray be for corner installations

For corner installations, cable trays should be supported on both sides of the bend with hangers spaced no more than 1. 5 meters apart to ensure stability and prevent cable stress.

Corner Support Guidelines

When installing cable trays at corners or bends, it is essential to install one hanger on each side of the corner, arranged symmetrically. This ensures that the tray remains stable and that the cables inside are not subjected to excessive stress or sagging. The distance between hangers at corners should typically not exceed 1.

5 meters, although this may vary depending on the tray type, load, and cable weight.

General Support Considerations

Fixed supports should be used at key points, including the beginning and end of the tray, corners, T-junctions, and spans longer than 30 meters. For horizontal runs, cables should be secured at the start, end, and every 3 to 5 meters along straight sections. For vertical runs, cables should be secured at the top and every 1.

5 meters.

NEC Compliance

The National Electrical Code (NEC) Article 392 governs cable tray installations. While it does not specify a fixed tray length for corners, it emphasizes proper support, secure fastening, and prevention of stress on cables at bends. Ensuring that hangers are correctly placed at corners aligns with NEC requirements for safe and reliable installations.

Practical Tip

When planning a corner installation, measure the distance from the last straight support to the corner and ensure that a hanger is installed on each side of the bend. This approach distributes the weight evenly, prevents sagging, and allows for safe cable pulling and maintenance in the future. By following these guidelines, corner installations will maintain structural integrity, comply with NEC standards, and protect cables from mechanical stress.