For standard mesh cable trays, crossarm or support spacing is typically 8 feet (2.4 meters), with shorter spans required for heavy cables or near bends.

Recommended Support Spacing

For Cablofil wire mesh trays, supports are generally spaced on 8-foot (2.4 m) spans for typical cable loads . Heavier cables, such as 750 kcmil multiconductor power cables, may require shorter spans to prevent excessive deflection . The maximum allowable deflection is calculated as tray width divided by 20; for example, a 12-inch tray should not deflect more than 0.6 inches under load .

Positioning Relative to Tray Features

• Couplers: Place supports at the start and end of couplers. For optimal performance, couplers should be positioned 1/5th of the span from the support .
• Bends: Supports should be installed before any deflection occurs. For 90° bends, place supports at the start and end, and for large-radius bends, a support should be positioned in the middle .
• Splices: Position supports near splices to maintain structural integrity and prevent sagging .

Considerations for Load and Environment

• Cable type and weight: Heavier or larger cables reduce the allowable span. Always consult the manufacturer's load tables for specific cable types .
• Tray width and material: Wider trays or those made from lighter materials may require closer support spacing.
• Environmental factors: Corrosive or high-temperature environments may affect material strength, potentially requiring shorter spans .

Summary

• Standard span: 8 feet (2.4 m)
• Maximum deflection: Tray width ÷ 20
• Shorter spans for heavy cables or near bends
• Supports at start/end of couplers, splices, and bends
• Always verify with manufacturer load tables for specific applications Following these guidelines ensures mechanical stability, proper cable support, and compliance with safety standards for mesh cable tray installations.