Specifications and dimensions of cable tray tee fittings

Cable tray tee fittings are available in widths from 6" to 36", heights from 4" to 7", and radii from 12" to 36", compatible with ladder and solid bottom trays.

General Overview

Cable tray tee fittings are used to connect three cable tray runs, enabling branching in three directions. They are manufactured to match the dimensions and types of the straight tray sections they connect, including ladder, solid bottom, and channel types. Tee fittings are typically made from aluminum or steel, offering corrosion resistance and structural strength suitable for industrial, commercial, and data center applications.

Dimensions

Widths: Standard widths range from 6 inches to 36 inches, measured as the usable inside width of the tray. Heights (Side Rail Height): Available in 4", 5", 6", and 7", controlling vertical stacking capacity and cable fill compliance. Radii: Fittings have a minimum radius of 12 inches, with options up to 36 inches, ensuring smooth cable routing and reducing stress on cables.

Tangent: All fittings include a 3-inch tangent to facilitate smooth transitions between straight and curved sections.

Construction and Load Capacity

Ladder Tray Type: Uses I-shaped rungs, typically 1" wide, with radiused edges and a minimum cable-bearing surface of 7/8". Solid Bottom Tray Type: Flat sheet welded over side rails, providing a continuous support surface for cables. Material: Aluminum for lightweight, corrosion-resistant applications; steel (hot-dip galvanized or bare) for heavy-duty industrial use.

Load Rating: Rungs and side rails are designed to support cable loads with a safety factor of 1. 5 and withstand a 200 lb concentrated load per NEMA VE 1 standards.

Standards Compliance

Cable tray tee fittings are manufactured in accordance with: ANSI/NFPA 70 – National Electrical CodeASTM A123, A653, A1011, A1008, B633 for steel and zinc coatingsNEMA VE 1 for metallic cable tray systems.

Summary

When specifying or ordering cable tray tee fittings, ensure the width, height, and radius match the straight tray sections, select the appropriate tray type (ladder or solid bottom), and confirm material and load capacity meet project requirements. Aluminum tees are ideal for lightweight, corrosion-resistant installations, while steel tees are suited for heavy-duty or industrial environments.