Cable tray specifications tee weight

Cable tray tees are standardized fittings used to branch cable runs, with specifications including material, dimensions, load class, and weight per size.

Material and Standards

Cable tray tees are typically fabricated from steel (hot-rolled, cold-rolled, or high-strength low-alloy) and may be galvanized or coated for corrosion resistance. Common standards include ASTM A123, A653, A1011, A1008, and B633 for steel and zinc coatings, and compliance with NEMA VE 1 and VE 2 for metallic cable tray systems. Tees are designed to integrate with ladder, trough, or solid-bottom trays and maintain structural integrity under load.

Dimensions

Widths: Standard tray widths for tees match the main runs, typically 150 mm, 203 mm, 300 mm, 450 mm, 600 mm, 750 mm, and 900 mm. Rung Spacing: For ladder trays, standard rung spacing is 150 mm, 225 mm, 300 mm, or ventilated openings up to 52 mm. Length: Tee fittings are sized to match the width of the intersecting trays; straight sections are usually 3 m or 6 m, with longer spans available on request.

Height and Side Member: The perpendicular distance between side rails is based on the tray type and load requirements.

Weight Table

The weight of a cable tray tee depends on tray width, material thickness, and load class. For medium-duty steel ladder trays (16–14 gauge), approximate weights are: 150 mm width: ~3–4 kg per tee300 mm width: ~6–8 kg per tee450 mm width: ~9–12 kg per tee600 mm width: ~12–16 kg per tee750 mm width: ~15–20 kg per tee900 mm width: ~18–24 kg per tee These weights are indicative and vary with material gauge, coating, and manufacturer. Tees often include integral jointing plates or couplers to ensure secure connections and maintain load capacity.

Load and Installation Considerations

Load Class: Defines the maximum supported cable weight over a given span; heavier loads require thicker gauge or additional supports. Support: Tees should be supported at intersections and along the main run to prevent sagging. Mounting: Can be installed on floors, walls, ceilings, or equipment racks, with modular configurations for easy integration.

Ventilation: Openings in ladder trays allow airflow around cables, reducing heat buildup.

Summary

Cable tray tees are critical for branching cable runs while maintaining structural integrity. Proper selection involves matching width, material, and load class to the main tray, considering weight, support spacing, and installation environment. Manufacturers like Unitray, Hubbell, Eaton, and Legrand provide detailed technical guides and weight tables to ensure compliance with CSA, NEC, and IEC standards.