Vertical Cable Tray Specifications and Dimensions Standards

Vertical cable trays, or risers, are designed to transition cables between different elevations, with standard widths, depths, and load ratings defined by industry codes and manufacturer specifications.

Standard Dimensions

Vertical cable trays are typically designed to match the horizontal tray system in width and material thickness to ensure structural continuity and proper cable support. Key dimensions include:

• Width (Inside Usable Width): Common nominal widths range from 100 mm to 600 mm (4" to 24") depending on cable volume and application . The outside width is slightly larger due to side rail thickness.
• Depth (Side Rail Height): Vertical trays often have side rail heights of 50 mm to 150 mm (2" to 6") for light to medium loads, with deeper rails for heavy-duty applications .
• Material Thickness: Steel trays typically use 1.2 mm to 2.0 mm gauge for light to medium duty, while aluminum trays may be thinner due to higher strength-to-weight ratio .
• Length: Standard vertical riser sections are usually 1 m to 3 m (3'3" to 10') and can be cut or joined with fittings to achieve the required height .

Specifications and Features

• Load Rating: Vertical trays are rated according to the span and load class, ensuring they can support the weight of cables without excessive deflection .
• Cable Fill Compliance: NEC and IEC standards limit cable fill to a percentage of the tray's usable area, typically 40–50%, to allow heat dissipation and prevent overcrowding .
• Material and Finish: Common materials include galvanized steel, stainless steel, and aluminum, with finishes selected for corrosion resistance and environmental conditions .
• Fittings: Vertical trays use adjustable risers, elbows, and junctions to connect horizontal runs to vertical sections. Adjustable risers slide inside the tray and can be set to the required height or angle .
• Covers: Solid or ventilated covers may be used to protect cables from dust, debris, or electromagnetic interference, depending on the application .

Diagram Overview

A typical vertical cable tray system includes:

1. Vertical Riser Section: Connects horizontal trays at different elevations.
2. Elbows or Bends: Allow smooth 90° or 45° transitions.
3. Support Brackets: Wall-mounted or floor-mounted brackets to secure the riser.
4. Cable Fill Area: Usable width × depth, calculated to comply with fill limits.
5. Covers (Optional): Solid or ventilated, depending on protection requirements. Manufacturers like Legrand (Swifts Cable Tray) provide detailed diagrams showing riser connections, adjustable fittings, and installation clearances . These diagrams illustrate how vertical trays integrate with horizontal runs, including the placement of support brackets and covers.

Installation Considerations

• Ensure alignment with horizontal trays to maintain cable routing efficiency.
• Verify load ratings for the total cable weight and any additional accessories.
• Maintain minimum bend radius for cables exiting the vertical tray to prevent damage .
• Use code-compliant supports and fasteners to meet NEC, NEMA, or IEC standards. By following these specifications and using manufacturer-provided diagrams, vertical cable trays can be safely and efficiently installed for industrial, commercial, or data center applications.