Cable fixing points in cable trays

Cables inside trays should be fixed at both ends, at bends, and at cable joints to ensure proper support, prevent sagging, and maintain safety.

Recommended Fixing Points

Cables laid inside a tray should be secured at the following locations:

• Both ends of the cable run: This prevents movement and ensures the cable remains properly aligned within the tray.
• At bends or changes in direction: Securing cables at horizontal or vertical bends prevents stress on the conductors and maintains the minimum bend radius.
• At cable joints or splices: Fixing cables at joints ensures mechanical stability and reduces the risk of damage at connection points. These points are critical for horizontal and vertical installations to maintain cable integrity and prevent sagging or tension-related damage (Gittewire) .

Fixing Methods

Common methods for securing cables inside trays include:

• Nylon cable ties: Flexible and easy to install, suitable for most power and control cables.
• Binding wires: Provide strong mechanical support, especially for heavier cables.
• Metal clips or clamps: Used for high-current or large-diameter cables to ensure firm attachment to tray rungs or mesh. The choice of fixing method depends on cable type, weight, and environmental conditions (Gittewire) .

Additional Considerations

• Spacing: Fixing points should be spaced to prevent sagging, typically every 1–1.5 meters for horizontal runs, but closer for heavier or larger cables.
• Cable separation: Maintain separation between power and signal cables using dividers or organizers to reduce electromagnetic interference (Automation Forum) .
• Bend radius: Ensure cables are not bent beyond their minimum radius at fixing points to avoid conductor damage (ABB Technical Guide) .
• Environmental protection: In corrosive or high-temperature environments, use corrosion-resistant ties or clips and consider additional insulation or covers (OBO CMS) . Properly planned fixing points not only enhance safety and compliance but also simplify future maintenance and cable additions.