Cable tray connection tee dimensions

Cable tray tee fittings are sized based on the widths of the main and branch trays, typically specified as W1 x W2 x W3, with depth and material thickness matching the connected trays.

Tee Fitting Overview

A cable tray tee connects three tray sections, allowing a branch to split from a main route while maintaining continuous cable support and structural integrity. Tee fittings can be equal (all three tray widths the same) or unequal (branch width differs from the main tray). Proper sizing ensures efficient cable routing, NEC compliance, and future expansion flexibility.

Standard Dimensions

Cable tray dimensions are standardized by width, depth (side rail height), length, and material thickness. When specifying a tee fitting: Widths (W1 x W2 x W3): W1 and W2 typically represent the main tray widths, and W3 represents the branch tray width. Equal tees have W1 = W2 = W3; unequal tees allow W3 to differ.

Depth/

Side Rail Height: Should match the connected trays to maintain vertical stacking capacity and NEC fill compliance. Material Thickness: Must be consistent with the main tray to support the expected cable load and span. Length: Tee fittings are manufactured to align with standard tray lengths, ensuring proper connection without field modification.

Installation Considerations

Maintain same elevation for all three tray sections unless a vertical branch is required. Ensure support spacing is adequate for the combined load of the main and branch trays. Verify compatibility with ladder, perforated, or wire mesh tray types, as dimensions vary by tray design.

When ordering, clearly specify equal or unequal tee and the corresponding widths (W1 x W2 x W3) to avoid onsite modifications.

Practical Example

For a main tray of 12 inches wide and a branch of 6 inches wide: Tee specification: 12 x 12 x 6Depth and material thickness should match the 12-inch main tray. Supports should be positioned to handle the combined weight of the main and branch cables. By following these dimensional guidelines, cable tray tee installations remain structurally sound, code-compliant, and easy to maintain.