For a 300-meter cable tray, MS angle steel of at least 50 x 50 mm with 6 mm thickness is commonly used, spaced at 1-meter intervals, but final sizing should consider load, tray type, and installation height.

Recommended Angle Steel Specifications

Based on practical installations and technical references, the following guidelines apply:

• Angle Steel Dimensions: A typical support for heavy cable trays uses 50 x 50 mm angles with 6 mm thickness for spans of up to 1 meter between supports . For longer spans or heavier cable loads, larger angles (e.g., 65 x 65 mm, 8 mm thick) may be required.
• Support Spacing: Supports are generally installed at 1-meter intervals along the tray length to prevent deflection and maintain structural integrity .
• Tray Load Considerations: The size of the angle steel must account for the weight of the cables, tray type (ladder, perforated, or solid), and any additional environmental loads such as wind or vibration .
• Installation Height: For elevated installations (e.g., 10–12 meters above ground), stronger or thicker angles may be necessary to resist bending and ensure stability .
• Connection Method: Angle steel supports are typically welded or bolted to the main structure, ensuring secure attachment and long-term durability .

Practical Example

In a documented installation, a 300 x 50 mm GI cable tray was supported using 50 x 50 mm, 6 mm thick MS angles at 1-meter intervals for a 150-meter section, with additional bridge supports for longer spans . This demonstrates that the 50 x 50 mm angle steel is sufficient for standard cable loads over long distances, provided proper spacing and secure fastening are maintained.

Key Considerations

• Cable Weight: Heavier power cables may require thicker or larger angles.
• Tray Type: Ladder trays may exert different loads than perforated trays.
• Environmental Factors: Outdoor or industrial environments may require corrosion-resistant steel or additional bracing.
• Engineering Verification: For a 300-meter run, it is recommended to consult a structural engineer to verify deflection limits and load capacity, especially if the tray carries high-voltage or heavy cables. By following these guidelines, a 50 x 50 mm, 6 mm thick angle steel with 1-meter spacing is a practical starting point for a 300-meter cable tray, with adjustments made based on load and site conditions .