Supports are installed on the slanted side of the cable tray

Supports for cable trays on slanted or inclined runs should be installed to maintain structural integrity, minimize deflection, and follow manufacturer and code guidelines.

Support Placement and Span

When a cable tray is installed on a slanted side, supports must be positioned to prevent sagging and maintain the tray's load-bearing capacity. The recommended practice is to place supports at intervals defined by the manufacturer, often 1/4 of the span for straight sections, which helps reduce stress at splice points and fittings (Eaton B-Line series guidance). For sloped trays, additional attention is needed to account for the gravitational pull on cables, which can increase deflection between supports.

Types of Supports

Common support methods include: Trapeze hangers: Suspended from ceilings, ideal for long slanted runs where the tray is not directly attached to a wall. Cantilever wall brackets: Mounted to walls, suitable for angled or sloped tray sections along vertical surfaces. Center suspensions: Used for additional support in the middle of long spans to prevent excessive bending.

Installation Considerations

Alignment: Ensure the tray remains level along its intended slope to prevent cable movement or stress on connectors. Load capacity: Verify that the combined weight of the tray and cables does not exceed the support's rated load, especially on slanted sections where weight distribution is uneven. Fittings and bends: Supports should be installed near bends, T-pieces, or vertical transitions to maintain stability and prevent deformation.

Compliance: Follow NEC Article 392 and NEMA VE 1 standards for support spacing, load ratings, and installation methods to ensure safety and code compliance.

Practical Tips

Use pre-punched holes or adjustable splice plates to simplify attachment of supports on slanted trays. For long sloped runs, consider additional intermediate supports to reduce deflection and maintain cable integrity. Always consult the cable tray manufacturer for specific recommendations regarding sloped installations, as tray design and material can affect support requirements.

By following these guidelines, supports on slanted cable trays will provide mechanical stability, prevent sagging, and ensure safe routing of cables in compliance with industry standards.