Cable tray main addition

Adding to a main cable tray involves using straight sections, fittings, supports, and accessories to extend, branch, or modify the primary cable run.

Main Components for Cable Tray Addition

Straight Sections: These are the primary lengths of tray that form the main cable run. They are available in standard lengths and can be connected using splice plates to extend the main tray. Fittings: Fittings allow the cable tray to change direction or branch out from the main run.

Common types include: Horizontal Bends: Change direction on the same plane (e.g., 30°, 45°, 90°). Vertical Bends (Risers): Move the tray to a different elevation. Tees and Crosses: Create branches from the main tray to secondary runs.

Reducers: Connect trays of different widths, often from a main run to a narrower branch. Supports: Proper support is essential to maintain structural integrity. Options include trapeze hangers, center-span supports, and wall brackets that anchor the tray to ceilings, walls, or floors.

Accessories: Additional components ensure safety and functionality: Covers: Protect cables from dust, moisture, and debris.

Hold-

Down Clamps: Secure covers to the tray base.

Drop-

Outs: Allow cables to exit vertically to connect to equipment below.

Material and Tray Type Considerations

The choice of tray material and type depends on the environment and cable load: Ladder Type: Strongest, ideal for heavy power cables with long spans. Solid Bottom Tray: Provides maximum protection from dust and moisture. Trough (Ventilated) Tray: Balances strength and ventilation.

Wire Mesh Tray: Lightweight, flexible, and easy to modify on-site. Channel Type: Suitable for lighter cable loads and horizontal distribution.

Installation Tips

Ensure proper alignment and secure connections using splice plates. Maintain adequate support spacing to prevent sagging. Consider thermal expansion and contraction when planning long runs.

Select materials and finishes appropriate for environmental conditions, such as galvanized steel for corrosion resistance or fiberglass for non-conductive applications. By combining these components correctly, a main cable tray can be safely extended or branched to accommodate additional cabling while maintaining structural integrity and accessibility.