How to automatically generate cable tray bends

Cable tray bends can be automated using Revit API, Dynamo workflows, or specialized bending systems like Cablobend for efficient and dynamic routing.

Software-Based Automation

1. Revit API and Fitting Creation While Revit does not natively auto-generate all cable tray fittings, you can use the Revit API to create custom fittings such as elbows, tees, and transitions. Functions like NewElbowFitting, NewTeeFitting, and NewTransitionFitting allow you to programmatically generate bends that adapt to different tray widths and heights, ensuring dynamic and clash-free routing . 2. Dynamo Workflow for Automation A more visual approach involves Dynamo, a computational design tool integrated with Revit. A typical workflow includes:

• Selecting the main tray and crossing elements.
• Extracting parameters like length, width, height, and base points using code blocks.
• Generating curve points aligned with the tray vector direction.
• Applying trigonometric functions to maintain standard bend angles (e.g., 45° offsets).
• Using Python scripts to dynamically adjust geometry and place trays along curves.
• Automatically inserting fittings at intersections and deviation points . This approach allows dynamic adjustment for different tray sizes and offsets, reducing manual editing and ensuring consistent bend geometry.

Physical Cable Tray Bending Systems

Cablobend EZ is a hardware solution designed for mesh cable trays. It allows installers to:

• Flexibly create vertical and horizontal bends up to 90° without cutting.
• Adjust bends for multiple tray widths (6” to 24”) and heights (2” to 6”).
• Reduce installation time from hours to minutes per bend.
• Maintain safety and rigidity with pre-assembled fittings and clips . This system is particularly useful in data centers or large installations where thousands of bends are required.

Practical Tips

• For Revit users, ensure your Electrical Settings allow “Use Any Angle” or specify the angles you need to avoid automatic 90° transitions .
• When creating elbows manually, a 45° bend typically requires two segments, while a 90° bend requires three segments to match real-world fabrication .
• Combining Dynamo automation with API-based custom fittings can provide a fully automated, parametric solution for complex cable tray networks.

Conclusion

Automatically generating cable tray bends can be achieved through software automation using Revit API or Dynamo, or through specialized bending hardware like Cablobend. Software solutions offer parametric flexibility and integration with BIM models, while hardware solutions accelerate physical installation. For large-scale projects, combining both approaches ensures efficiency, accuracy, and adaptability to different tray sizes and angles.