Requirements for Supports for Cable Tray Installation Along Walls

Wall-mounted cable tray supports must be securely fastened, spaced according to load and manufacturer specifications, and comply with relevant standards such as IEC 61537 and NEC 392. 22.

Support Methods and Mounting

For cable trays installed along walls, cantilever wall brackets are commonly used. These brackets are mounted directly to the wall and support the tray horizontally, ensuring stability and proper load distribution. The choice of bracket depends on the wall material, tray type, and anticipated cable load.

Proper attachment to the building structure is essential to prevent sagging or failure under the weight of cables and environmental factors.

Support Spacing

The support spacing (distance between adjacent brackets) is determined by the manufacturer's load capacity chart and the total anticipated weight of the cables. Overloading or exceeding the recommended span can lead to tray deformation or failure. Typical spacing varies depending on tray type (ladder, solid-bottom, or ventilated) and material (steel, stainless steel, or aluminum), but it must always comply with IEC 61537 guidelines for mechanical strength.

Load Considerations

Cable trays are designed to support the weight of cables and associated equipment, not to serve as walkways or support personnel. The total cable weight, including any future additions, must be calculated to ensure the tray and supports can handle the load. Environmental factors such as wind, snow, or vibration should also be considered, especially for exterior or high-rise installations.

Material and Corrosion ProtectionWall-mounted supports and trays are typically made of steel, stainless steel, or aluminum. Corrosion protection, such as galvanization or coatings, is important for durability, particularly in humid, coastal, or industrial environments. Stainless steel or aluminum may be preferred in corrosive conditions.

Compliance and Safety

Standards: Installations should comply with IEC 61537 for cable tray systems and NEC 392. 22 for fill capacity and spacing. Cable Fill: Ensure the tray is not overfilled to prevent overheating and maintain ampacity.

Calculate the total cross-sectional area of cables and compare it to the maximum permissible fill area. System Integrity: Use compatible components (trays, fittings, and supports) designed and tested together to maintain mechanical and electrical safety.

Summary

To properly install cable tray supports along walls: Use cantilever wall brackets or other suitable wall-mounted supports. Follow manufacturer-specified support spacing based on load. Ensure material and corrosion protection are appropriate for the environment.

Calculate cable weight and fill to avoid overloading. Comply with IEC 61537 and NEC 392. 22 standards for safety and performance.

Avoid using trays as walkways or for supporting personnel. Following these requirements ensures a safe, durable, and code-compliant wall-mounted cable tray installation.