Spacing requirements for vertical cable tray ladder supports

Vertical cable ladder supports should generally be spaced at a maximum of 1. 2 to 2 meters, with rungs spaced at 300 mm, depending on cable weight and installation standards.

Rung and Support Spacing

For vertical cable ladders such as STL, STM, and STIC types, the distance between rungs is typically 300 mm to ensure proper cable support and prevent kinking or slipping. The fastening spacing to walls or structural supports should generally be less than or equal to 1. 2 meters when using standard wall connection angles, with a maximum cable dead weight of 20 kg/m.

For vertical runs in general cable tray systems, supports should be fixed to the building structure with a spacing preferably less than 2 meters to maintain stability and safety.

Fastening and Material Considerations

Wall or structural fasteners: Use M8 bolts for STL and STM ladders, and M10 bolts for STIC ladders. Suspended installations: If direct wall mounting is not possible, vertical ladders can be installed using adapters or suspended supports. Material: Galvanized or stainless steel is recommended for corrosion resistance, especially in industrial or high-temperature environments.

Cable Securing

Vertical cable runs: Cables should be secured at the top and every 1. 5 meters along the ladder. Binding: Cable ties should not exceed 1.

5 meters apart to ensure even tension and prevent sagging. Riser systems over 3. 5 meters: Additional lateral support or strain relief housings may be required to maintain circuit integrity.

Compliance and Safety

Vertical cable ladders must comply with DIN 4102 Part 12 for fire-resistant installations and circuit integrity classes (E30, E60, E90),. Supports must withstand the mechanical load of the cables and any additional environmental forces such as wind or vibration. Proper spacing ensures that cables are not exposed to undue mechanical strain and that the system remains stable in the event of fire or other emergencies.

Summary Recommendations

Rung spacing: 300 mmWall/structural support spacing: ≤ 1. 2 m for standard ladders; ≤ 2 m for general vertical cable traysCable securing interval: every 1. 5 m verticallyBolt sizes: M8 for STL/STM, M10 for STICMaterial: Galvanized or stainless steelAdditional support: Required for vertical runs over 3.

5 m or heavy cable loads Following these guidelines ensures mechanical stability, fire safety compliance, and proper cable management for vertical cable ladder installations.