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How to automatically generate T-junctions on cable trays

T-junctions on cable trays can be automatically generated in Revit using proper family loading, routing settings, or specialized plugins, while wire mesh trays allow on-site TEE junction creation without additional fittings.Using Revit for Automatic T-Junctions
  1. Load the Correct Fitting Families Revit can auto-generate elbows, tees, and crosses when cable trays intersect or branch, but this requires the correct TEE fitting families to be loaded into the project before routing begins . Without these families, Revit cannot create vertical or horizontal T-junctions automatically.
  2. Configure Electrical Settings
    • Navigate to MEP Settings → Cable Tray Settings.
    • Ensure angle defaults and bend radius are set appropriately. For example, using “Use Any Angle” allows Revit to create non-90° connections automatically .
    • Adjust offsets carefully; large vertical offsets may force Revit to create 90° bends instead of 45° transitions, which may require manual adjustment .
  3. Create Custom Families if Needed For vertical T-junctions or non-standard configurations, you may need to create a custom Revit family representing the TEE fitting. This family can then be used in routing to allow automatic generation of the junction .
  4. Use Plugins for Enhanced Automation Tools like the EAE Cable Tray Plugin allow users to draw cable tray routes, segment them, and automatically apply product-specific fittings, including T-junctions, while keeping the model updated with the latest manufacturer data . This reduces manual adjustments and ensures compliance with standards.
Wire Mesh Cable Trays

For wire mesh cable trays, TEE junctions can be created directly on-site without pre-fabricated fittings. The process involves:

  • Cutting the mesh at the branching point.
  • Bending the mesh to form a three-way connection.
  • Securing the junction with clamps or fasteners. This method is fast, cost-effective, and widely used in industrial projects, data centers, and infrastructure installations in India and globally . Best practices include avoiding excessive wire cutting, ensuring proper alignment, and supporting the junction to prevent sagging or cable damage.
Practical Tips
  • Always start with the correct template in Revit to ensure all cable tray content is available .
  • For vertical T-junctions, consider creating a horizontal run with an elbow and adjusting elevations to approximate the TEE if a suitable family is unavailable .
  • Group or lock connected segments to maintain alignment when moving trays in 3D views.
  • Verify that bend radius and offsets comply with cable manufacturer recommendations to prevent cable stress. By combining proper Revit settings, custom families, or plugins, and understanding wire mesh tray techniques, T-junctions can be generated efficiently, reducing manual work and ensuring accurate routing.
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