Installation of irregularly shaped cable trays

Irregularly shaped cable tray supports should be installed using custom-fitted components, proper load calculations, and secure mounting methods to ensure structural integrity and compliance with standards.

Planning and Design

When installing irregularly shaped cable tray supports, careful planning is essential. Begin by mapping the tray route and identifying areas where standard supports cannot be used due to bends, offsets, or non-linear paths. Custom support brackets or adjustable fittings may be required to accommodate unusual angles or shapes.

Ensure that the design maintains the minimum bend radius for cables to prevent damage and allows for future cable additions.

Material Selection

Choose materials that match the environmental and mechanical requirements. Steel, stainless steel, or aluminum are commonly used, with finishes such as galvanization or powder coating for corrosion resistance. For irregular shapes, lightweight and formable materials like aluminum or pultruded fiberglass can simplify installation while maintaining strength.

Support Methods

Common support methods include: Trapeze hangers: Ideal for ceiling suspensions, allowing multiple attachment points for irregular shapes. Cantilever wall brackets: Mounted directly to walls, suitable for offset or non-linear tray runs. Custom-fabricated brackets: For unique angles or intersections, ensuring the tray remains level and secure.

Supports should be spaced according to the load requirements, including the weight of cables, equipment, and any imposed loads such as wind or vibration. Check manufacturer specifications for maximum span and deflection limits.

Installation Considerations

Avoid cutting or drilling structural building members without approval. Ensure all components are compatible and tested together to maintain system integrity. Use non-metallic banding for bundling components to prevent corrosion or contamination.

Verify that the installed supports do not exceed deflection limits and maintain proper alignment for cable routing.

Compliance and Safety

Follow relevant standards such as BS EN 61537 for cable trays and supports, and NEC Article 392 for cable fill and spacing. Proper grounding, bonding, and secure attachment are critical to prevent mechanical failure and ensure electrical safety.

Summary

Installing irregularly shaped cable tray supports requires a combination of customized support components, careful load analysis, and adherence to standards. By selecting appropriate materials, using flexible support methods, and planning for cable routing and future expansion, you can achieve a safe, durable, and code-compliant installation.