The recommended span for FRP/GRP cable trays in Saudi Arabia typically ranges from 1.5 to 3 meters, depending on tray type, load, and support method, following international standards like BS50085 and IEC 61537.

Standard Span Guidelines

Fiberglass (FRP/GRP) cable trays are widely used in Saudi Arabia for industrial, commercial, and petrochemical installations due to their corrosion resistance, lightweight, and electrical insulation properties . The span between supports depends on:

• Tray type: Ladder-type trays generally allow longer spans than perforated trays due to structural rigidity .
• Load: Heavier cable loads require shorter spans to prevent deflection.
• Tray width and depth: Wider or deeper trays need closer support spacing.
• Environmental factors: High temperatures or UV exposure may slightly reduce allowable spans. Typical spans for FRP/GRP ladder trays are:
• Light to medium loads: 1.8–2.4 meters (6–8 feet)
• Heavy loads: 1.2–1.8 meters (4–6 feet)
• Perforated trays: 1.2–2.0 meters (4–6.5 feet) depending on rung spacing and thickness

Rung and Support Considerations

• Rung spacing: Standard rung spacing is 150 mm, 225 mm, or 300 mm (6”, 9”, 12”) for ladder trays .
• Support types: Trays can be supported by wall brackets, ceiling hangers, or trapeze supports. Proper selection ensures minimal deflection and maintains cable integrity.
• Deflection limits: Maximum allowable deflection is typically L/200 to L/300 of the span length, where L is the distance between supports.

Installation Best Practices

• Ensure compliance with international standards (BS50085, NEMA VE 1, BS/IEC 61537, ASTM, UL) for safety and durability .
• Use UV-resistant and corrosion-resistant FRP materials for outdoor or harsh environments .
• Avoid excessive overloading; calculate total cable weight and dynamic loads.
• Consider thermal expansion in long runs; allow for expansion joints if necessary.

Summary

For FRP/GRP cable trays in Saudi Arabia:

• Ladder trays: 1.8–2.4 m span for light loads, 1.2–1.8 m for heavy loads.
• Perforated trays: 1.2–2.0 m span, depending on thickness and rung spacing.
• Always follow manufacturer guidelines and international standards to ensure safety, structural integrity, and long-term performance . These spans provide a balance between structural support, ease of installation, and cost efficiency for industrial and commercial projects.