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Connecting cable trays of different materials

Connecting cable trays of different materials requires careful consideration of mechanical compatibility, corrosion prevention, and grounding to ensure a safe and durable installation.Material Compatibility

When joining cable trays made of different metals, such as aluminum and steel, or aluminum and stainless steel, the primary concern is galvanic corrosion. Galvanic corrosion occurs when two dissimilar metals are in electrical contact in the presence of moisture, causing the less noble metal (e.g., aluminum) to corrode faster than it would alone . Fiberglass Reinforced Plastic (FRP) trays, being non-metallic, do not participate in galvanic corrosion but require compatible mechanical fasteners and supports .

Mechanical Connection Considerations
  • Fittings and adapters: Use manufacturer-approved transition fittings or adapters designed to join different tray materials. These ensure proper alignment, load transfer, and structural integrity .
  • Fasteners: Stainless steel or coated fasteners are recommended when connecting aluminum to steel to minimize corrosion risk. Avoid direct contact between bare aluminum and steel .
  • Support spacing: Maintain proper support intervals according to the tray material's load capacity. Aluminum trays are lighter but less rigid than steel, so additional supports may be needed at the transition .
Electrical and Grounding Considerations
  • Bonding: Ensure continuous electrical bonding across the transition. If using FRP trays, provide a separate grounding conductor since FRP is non-conductive .
  • Isolation: Consider insulating gaskets or bushings between dissimilar metals to prevent galvanic corrosion while maintaining mechanical stability .
Environmental Factors
  • Indoor vs. outdoor: Aluminum and galvanized steel perform well indoors, but outdoor or humid environments may accelerate galvanic corrosion if dissimilar metals are joined without isolation .
  • Chemical exposure: In chemical plants or marine environments, stainless steel or FRP may be preferred for transitions due to superior corrosion resistance .
Best Practices
  1. Use transition fittings recommended by the tray manufacturer.
  2. Apply protective coatings or insulating barriers between dissimilar metals.
  3. Ensure proper grounding and bonding across the entire tray system.
  4. Verify load capacity and support spacing at the connection point.
  5. Regularly inspect the joint for signs of corrosion or mechanical stress. By following these guidelines, cable trays of different materials can be safely connected while minimizing corrosion, maintaining structural integrity, and ensuring compliance with industry standards such as IEC 61537 and NEC .
Connecting cable trays of different materials

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This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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