Cable Shaft and Cable Tray Installation Standards

Cable tray shaft supports must comply with IEC 61537 and DIN EN 61537 standards, ensuring proper load capacity, spacing, corrosion protection, and secure attachment to structural elements. Key Standards and GuidelinesIEC 61537 is the internationally recognized standard for metal cable tray systems, covering construction, testing, and performance requirements for cable trays and their support systems. It ensures that cable trays can safely carry electrical loads, withstand environmental conditions, and maintain electrical continuity.

DIN E

N 61537 provides similar guidance in Europe, specifying materials, corrosion protection, and installation practices. Compliance with these standards is essential for safety, durability, and regulatory approval.

Support Spacing and Load Considerations

Vertical shaft supports should be designed to handle the weight of the cable tray plus the maximum anticipated cable load. Load calculations must consider dynamic factors such as vibration or thermal expansion. Typical support spacing for horizontal runs is often 1.

5–3 meters, but vertical shaft supports may require closer intervals depending on tray type, material, and load. Rung spacing for ladder-type trays is generally 150–230 mm to maintain cable stability and prevent sagging.

Materials and Corrosion Protection

Cable trays and supports are commonly made from steel, stainless steel, or aluminum, with galvanization or other coatings to resist corrosion. Stainless steel (AISI 316L) is preferred in marine or chemical environments due to its high corrosion resistance. Aluminum trays offer lightweight and corrosion-resistant alternatives, suitable for indoor or mildly corrosive environments.

Installation Best Practices

Supports must be securely fastened to structural elements using appropriate anchors or brackets; fasteners are typically standardized separately from the tray system. Thermal expansion and contraction should be accommodated with expansion joints or flexible supports to prevent stress on the tray. Electrical continuity should be maintained if the tray serves as a grounding path, ensuring proper bonding between tray sections and supports.

Separation of cable types (power, control, instrumentation) may be required to reduce electromagnetic interference and maintain safety.

Additional Considerations

Environmental factors such as humidity, chemical exposure, and temperature extremes must be considered when selecting support materials and coatings. Manufacturer guidelines (e.g., ABB, Eaton, OBO Bettermann) provide specific recommendations for support spacing, load ratings, and installation methods tailored to their tray systems. Inspection and maintenance are critical to ensure long-term performance, particularly in vertical shafts where access may be limited.

By following these standards and best practices, cable tray shaft installations can achieve structural integrity, safety, and compliance across industrial, commercial, and utility applications.