Common Aluminum Alloy Ladder-Type Cable Trays

Aluminum ladder-type cable trays are lightweight, ventilated systems with tubular rungs, swaged connections, and compliance with UL, NEMA, and CSA standards, designed for easy cable installation and high load capacity.

Structural Design

Aluminum ladder trays consist of two side rails connected by transverse rungs, forming a ladder-like structure that provides maximum ventilation for cables and easy access for installation or maintenance . The rungs are typically tubular and connected to the side rails using a cold swaging process, which compresses the rung material around the rails without heat, ensuring superior mechanical and electrical connections . This design maintains structural integrity even in high-vibration environments.

Material and Finish

These trays are made from aluminum alloy, which is lighter than steel, making them easier to handle and install while maintaining strength . Aluminum also provides corrosion resistance, suitable for industrial and outdoor applications.

Dimensions and Rung Spacing

• Load depth: Commonly ranges from 4 inches to higher, depending on the model .
• Width: Standard widths include 6 inches, 12 inches, 36 inches, and 42 inches .
• Rung spacing: Typically 9 to 12 inches on center, depending on load requirements .
• Length: Standard straight sections are often 12 feet long, with flanges around 13/16 inches .

Load Ratings and Deflection

Aluminum ladder trays are designed with a 1.5 safety factor and can support additional concentrated loads of up to 200 lb on any portion of the tray, including side rails and rungs . Deflection is measured at the midpoint for simple spans, and continuous spans can reduce deflection by up to 50% . Load classes follow NEMA and CSA standards, with options for various industrial applications .

Standards and Certifications

• UL-listed and C-UL listed for safety and compliance .
• NEMA VE-1 standards for metal cable tray systems .
• CSA-certified for Canadian applications .

Accessories and Fittings

• Splice plates: Curvilinear or snap-in designs for rigid connections, ensuring flush alignment and structural integrity .
• Zero tangent fittings: Allow parallel trays to be installed with minimal spacing, saving up to 6 inches per row .
• Covers: Optional for additional cable protection.
• Horizontal and vertical fittings: Enable changes in direction within the same plane or to different planes .
• Supports: Provide secure mounting for straight sections and fittings .

Advantages

• Lightweight and corrosion-resistant due to aluminum construction .
• Easy cable installation and maintenance with open ladder design .
• High load capacity with minimal deflection .
• Versatile with a wide range of accessories and fittings for complex routing . Aluminum ladder-type cable trays are ideal for industrial, commercial, and high-vibration environments, offering a balance of strength, accessibility, and compliance with international standards.