Cables can be safely laid inside galvanized flat steel cable trays by following proper support, spacing, and corrosion protection practices.

Material and Corrosion Considerations

Galvanized steel trays provide sacrificial protection against corrosion, as the zinc coating corrodes preferentially, forming a protective patina of zinc carbonate over time . For areas with higher moisture or corrosive environments, hot-dip galvanizing or stainless steel trays may be preferred to extend lifespan . Any scratches or exposed steel should be treated with anti-corrosive paint to maintain protection .

Tray Installation and Support

• Supports should be installed to meet the load requirements of the cable tray system, considering future cable additions .
• Maintain a minimum clearance of 300mm above or between trays for cable installation and maintenance .
• Support spacing should not exceed 600mm from bends or tray outputs, and splice plates should be installed at approximately ¼ of the gap between supports to avoid stress points .
• Trays should be level and aligned, with horizontal deviations not exceeding 2mm per meter and vertical deviations within 3mm .

Cable Laying Practices

• Ensure cables are laid without exceeding their minimum bending radius, which is determined by the largest cable in the tray .
• When multiple cables are installed, consider the largest bending radius to facilitate installation.
• For MC-type cables rated 600V or less, separators are not required; otherwise, separators may be necessary to prevent interference .
• Avoid sharp edges or burrs on tray ends to prevent cable damage during installation .

Storage and Handling

• Store trays horizontally on flat surfaces with timber supports at intervals of about 1 meter, and protect them from moisture and direct sunlight before installation .
• Inspect all materials for damage or discrepancies before installation, and remove unsuitable items from the site .

Compliance and Safety

• Installation should comply with approved shop drawings and local electrical codes .
• Ensure electrical continuity every 18 meters and proper grounding of the tray system .
• Avoid cutting or drilling structural building members without approval from the general contractor . By following these guidelines, galvanized flat steel cable trays can provide a durable, safe, and organized pathway for electrical cables, ensuring long-term performance and ease of maintenance.