How to deal with galvanized cable trays that are too soft

Galvanized cable trays can feel too soft due to insufficient support spacing, thin tray material, or inadequate design, but their rigidity can be improved with proper reinforcement and installation practices.

Reasons for Softness

1. Tray Material and Thickness: Galvanized trays, especially pre-galvanized or electro-galvanized types, may have thinner steel compared to hot-dip galvanized trays, making them more prone to bending under heavy cable loads .
2. Support Spacing: Excessive distance between support brackets can cause sagging. Standard practice recommends supporting trays every 2–3 meters, but reducing spacing to 1.5–2 meters in high-load areas significantly increases stiffness .
3. Tray Design: Ladder-type trays with shallow sidewalls or low collars provide less rigidity. Taller sidewalls (50–100 mm) or internal dividers can enhance load distribution and reduce deflection .
4. Installation Issues: Loose brackets, misaligned joints, or improper fastening can allow trays to shift or vibrate, further reducing perceived stiffness .

Solutions to Improve Rigidity

• Increase Support Frequency: Add additional brackets or reinforcement at bends and high-load sections to prevent sagging .
• Select Thicker or Hot-Dip Galvanized Trays: Hot-dip galvanization provides a thicker coating (65–85 microns) and often uses stronger steel, improving both corrosion resistance and structural strength .
• Use Tray Accessories: Internal collars, dividers, and modular expansion accessories can stiffen trays and distribute cable weight more evenly .
• Proper Installation Practices: Ensure brackets are tightened with expansion bolts, joints are aligned, and any on-site cuts are recoated to prevent corrosion and maintain integrity .

Additional Considerations

• Load Assessment: Always adhere to manufacturer load tables to avoid exceeding the tray's rated capacity .
• Environmental Factors: In humid or outdoor environments, corrosion can weaken trays over time. Inspect coatings and repair any damage immediately .
• Compliance: Follow IEC 61537 or NEMA VE 1 standards to ensure trays can safely support cables without failure . By addressing material selection, support spacing, tray design, and installation quality, galvanized cable trays can achieve sufficient rigidity to safely support heavy cable loads and maintain long-term performance.