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How to change the diameter of a cable tray in Revit

In Revit, you can change the size of a cable tray by modifying its type properties or adjusting the cable tray size settings, though straight runs have some limitations compared to fittings.

Modifying Cable Tray Size via Electrical Settings

  1. Go to the Manage tab and select MEP Settings → Electrical Settings.
  2. In the Electrical Settings dialog, expand Cable Tray Settings and click Size.
  3. Select the cable tray size you want to modify and click Modify Size.
  4. Enter the desired dimensions (width, height, or diameter) in the Modify Cable Tray Size dialog and click OK to apply the changes .

Changing Type Properties in the Project

  1. Select the cable tray in your project.
  2. Click Edit Type in the properties panel.
  3. Adjust parameters such as Width, Height, Offset, and Bend Radius. These parameters control the overall size and routing behavior of the tray .
  4. Click Apply and OK to save the changes.

Considerations for Straight Runs vs Fittings

  • Fittings (like elbows, T-junctions, and reducers) have more editable parameters, including side plate thickness and bend radius.
  • Straight runs are more limited; some parameters, such as the thickness of side plates, are not directly editable in Revit. In such cases, you may need to use annotations or detail views to represent custom thicknesses for presentation purposes .
  • The Height Reference and Side Reference settings determine how the tray aligns in 3D space and can affect the perceived diameter or clearance .

Best Practices

  • Use cable tray families with fittings when you need full control over dimensions and appearance.
  • For straight runs where certain parameters are not editable, consider tagging or detailing the tray to communicate design intent.
  • Always check the electrical system and manufacturer data sets to ensure the selected size is compatible with your project requirements . By following these steps, you can effectively modify the diameter or size of cable trays in Revit while understanding the limitations of straight runs versus fittings.

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