Cable tray supports must comply with IEC 61537, be properly spaced, securely mounted, and designed to handle mechanical loads, environmental conditions, and cable weight.

Standards and Compliance

Cable tray supports should be installed in accordance with IEC 61537, which specifies construction, testing, and performance requirements for metal cable tray systems, including steel, stainless steel, and aluminum trays . Compliance ensures mechanical strength, corrosion resistance, electrical continuity, and fire safety. In the UK, BS EN 61537 applies, while channel support systems follow BS 6946 . Using components designed and tested together as a system is critical for safe installation .

Material and Corrosion Considerations

Supports are typically made of steel, stainless steel, or aluminum, with galvanization or other coatings to improve corrosion resistance . Stainless steel is preferred in highly corrosive environments, while aluminum offers lightweight and corrosion-resistant properties . Proper material selection depends on environmental conditions, including humidity, chemical exposure, and temperature.

Mounting and Spacing

Cable tray supports must be securely fastened to ceilings, walls, or floors using appropriate anchors or fasteners . The span between supports depends on tray type, material, and load but should follow manufacturer recommendations and IEC 61537 load testing guidelines . For ladder-type trays, rung spacing of 150–230 mm (6–9 inches) is recommended to maintain cable positioning and prevent sagging . Supports should allow for proper cable bend radius at tray exits.

Load and Mechanical Strength

Supports must withstand the weight of installed cables, environmental loads, and any additional mechanical forces, including short-circuit electromagnetic forces . Load calculations should consider the total cable weight, tray type, and any dynamic forces. Overloading can compromise structural integrity and safety.

Safety and Installation Practices

• Only competent personnel familiar with electrical installation practices should perform installation .
• Cable trays are not designed for walking or supporting personnel.
• Ensure proper ventilation and fill ratio to prevent overheating of cables .
• Use compatible system components to maintain electrical continuity and grounding.
• Avoid contact corrosion by ensuring proper separation of dissimilar metals and minimizing moisture accumulation .

Accessories and System Integration

Cable tray supports include fittings, risers, bends, and mounting elements that must be compatible with the tray system . Proper integration ensures stability, alignment, and compliance with safety standards.

Summary

Proper installation of cable tray supports requires adherence to IEC 61537, careful selection of materials, correct mounting and spacing, load assessment, and attention to environmental and safety factors. Following these guidelines ensures a durable, safe, and efficient cable management system for electrical and communication installations .