Standard aluminum alloy cable trays

Aluminum alloy cable trays are typically made from AA 6063 for side rails and AA 5052 for fabricated parts, with standardized rung spacing, load ratings, and compliance with NEMA, UL, and CSA standards.

Material and Construction

Aluminum cable trays are constructed using Aluminum Association Alloy 6063 for straight section and fitting side rails, while all fabricated parts are made from Alloy 5052 for enhanced corrosion resistance and mechanical strength . Ladder-type trays consist of two longitudinal side rails with transverse rungs welded to the rails. All edges and welds are rounded and smooth to prevent cable damage . The trays are lightweight, making them easier to handle and install compared to steel trays .

Dimensions and Rung Spacing

• Rung spacing: Standard spacing is 6, 9, or 12 inches, with radiused fittings typically using a 9-inch center measurement .
• Tray widths: Common widths include 6, 9, 12, 18, 24, 30, and 36 inches .
• Tray depths: Standard depths range from 3 to 6 inches per NEMA VE 1 guidelines .
• Tray lengths: Straight sections are supplied in 10, 12, 20, or 24-foot lengths .

Load Ratings and Safety

Each tray section is designed to support an additional 200 lb concentrated load on any portion of the tray (side rail, rung, etc.) above the cable load, with a safety factor of 1.5 . Straight sections have side rails fabricated as I-beams to enhance structural strength. Continuous spans may reduce deflection by up to 50%, and deflection factors can be applied for lighter loads .

Fittings and Splice Plates

• Splice plates: Wedge-Lock design with 4 nuts and bolts per plate ensures minimal electrical resistance (≤0.00033 ohm) between adjacent sections .
• Fittings: Minimum bend radii are typically 12, 24, 36, or 48 inches, depending on the installation requirements .

Standards and Certifications

Aluminum cable trays are CSA certified, UL listed, and compliant with NEMA standards . They are designed to meet electrical and mechanical safety requirements, including resistance to corrosion, stress cracking, and pitting in various environments . Installation should follow the latest NEMA VE 2 guidelines and manufacturer instructions .

Corrosion Resistance

Aluminum's natural oxide layer provides excellent corrosion resistance, making these trays suitable for indoor and outdoor applications, including industrial and marine environments . Alloy selection ensures durability while maintaining a high strength-to-weight ratio.

Summary

Standard aluminum alloy cable trays combine lightweight construction, corrosion resistance, and high load capacity. Key specifications include AA 6063 side rails, AA 5052 fabricated parts, rung spacing of 6–12 inches, widths up to 36 inches, and safety factor of 1.5, with compliance to NEMA, UL, and CSA standards for reliable and safe cable management .