Cable tray support specifications and models

Cable tray support systems are designed to securely hold cable trays and ladders, with specifications defined by material, load capacity, mounting type, and compliance with standards like DIN EN 61537 and NEMA.

Key Components and Materials

Cable tray support systems consist of support elements, mounting elements, and accessories. Support elements include wall brackets, suspended supports, and center suspensions that attach trays to ceilings, walls, floors, or steel structures. Mounting elements secure junction boxes or devices to the tray, while accessories include covers, barrier strips, and cable protection rings . Materials are typically steel or stainless steel, often with galvanization or coatings for corrosion protection .

Support Types and Mounting

• Wall and ceiling brackets: Fixed supports for horizontal or vertical tray runs.
• Suspended supports: Rods or hangers for overhead installations.
• Center supports: Used for long spans to prevent sagging.
• Adjustable splice plates: Allow alignment and expansion between tray sections . Supports can be mounted to floors, walls, ceilings, equipment racks, or cabinets, depending on the installation environment .

Load Capacity and Span

Cable tray supports are rated by load class, which defines the maximum weight a tray can carry over a specific span. The span distance between supports directly affects the tray's load-bearing capacity. For example, Eaton's B-Line series emphasizes reducing the number of supports to optimize structural steel usage while maintaining strength . Hubbell's NEXTFRAME® ladder trays specify load class based on support spacing and cable weight .

Corrosion Protection

• Hot-dip galvanized steel: Provides a zinc barrier to prevent rust, suitable for outdoor or industrial environments .
• PVC-coated steel or aluminum: Previously used for additional protection but less common today .
• Stainless steel: Ideal for highly corrosive or chemical environments.

Standards and Compliance

Cable tray support systems must comply with DIN EN 61537 for industrial installations, ensuring mechanical strength, safety, and proper cable routing . In the U.S., NEMA standards define material thickness, galvanization, and load ratings . CE marking indicates compliance with European directives .

Practical Considerations

• Span and support spacing: Determine based on cable weight and tray type.
• Fittings: Include horizontal/vertical bends, T-pieces, crossovers, and end closures to route cables efficiently .
• Installation environment: Consider exposure to water, oil, chemicals, snow, or wind when selecting materials and support types .
• Modular design: Allows easy reconfiguration for new or existing cable routes . By selecting the appropriate support model, material, and mounting method, engineers can ensure safe, durable, and cost-effective cable tray installations for industrial, commercial, or data center applications.