Cable tray tee unfolded dimensions diagram
A cable tray tee unfolded diagram shows the flat pattern of the tee, including the main run and branch, with side flanges and bend allowances for fabrication.
Understanding a Cable Tray Tee
A cable tray tee is a three-way fitting that allows a main cable tray run to branch off at 90° while maintaining structural support. The tee consists of:
- Main run section: The straight portion of the tray.
- Branch section: The perpendicular extension.
- Side flanges: Typically 1–2 inches high, providing rigidity and cable containment.
- Bend allowances: The areas where the tray is bent to form the tee.
Typical Unfolded Dimensions
When unfolded (flat pattern), a cable tray tee can be represented as a single sheet with cutouts and flanges. The dimensions depend on the tray size (width × depth) and flange height. For example, for a 12-inch wide × 4-inch deep tray with 1.5-inch flanges:
- Main run panel: 12 inches wide × length of the run (e.g., 24 inches for the tee section)
- Branch panel: 12 inches wide × 24 inches long
- Side flanges: 1.5 inches along all edges
- Cutouts: The branch section is cut from the main run panel, leaving tabs for bending the flanges A simplified unfolded diagram can be visualized as:
Branch ----------------- | | | | | | ----------------- Main Run ----------------- | | | | | | -----------------Side flanges along all edges (1.5 in)
- The overlapping area where the branch intersects the main run is cut and bent to form the tee.
- Bend lines are marked along the edges of the flanges.
- Flange height is consistent with the tray depth to maintain cable containment.
Notes on Fabrication
- Flanges are typically bent 90° from the flat sheet.
- Material thickness is usually 16–14 gauge steel for ladder or perforated trays.
- The unfolded pattern must account for bend allowances, typically 0.25–0.5 inches per bend depending on material thickness.
- Standardization ensures compatibility with straight tray sections and other fittings ( ).
References for Detailed Dimensions
For precise dimensions, including NEMA load classes, tray widths, and depths, consult:
- Legrand Cable Tray Technical Guide ( )
- Eaton Cable Tray Manual ( )
- ABB Cable Tray Systems Catalog ( ) These references provide tables for tray widths, depths, and recommended fitting sizes, which can be used to calculate exact unfolded patterns for any specific tee fitting.
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