Revit cable tray cannot be connected

Cable trays in Revit often fail to connect due to missing or unassigned fittings, elevation mismatches, or template-related system family settings.Common CausesMissing or Unassigned Fittings Cable trays require fittings (like elbows, tees, and reducers) to connect properly. Even if fittings are loaded into the project, they must be assigned to the cable tray type under the routing preferences. Without this, Revit cannot automatically generate connections between trays .System Family Limitations Cable trays are system families, not loadable families. You cannot load a new cable tray type directly; instead, you must duplicate an existing tray type and assign the desired fittings. Fittings themselves are loadable families and must be present in the project for connections to work .Elevation or Alignment Issues Trays must be on the same level and properly aligned. If trays are askewed or at different elevations, Revit will fail to connect them automatically. For vertical connections, you may need to use vertical bends or create a custom family to simulate a tee or elbow .Template or Project Standards Using a custom template may not include all necessary tray types or fittings. You can transfer project standards from a default Revit electrical template or another project to ensure all required families and types are available .Step-by-Step SolutionsLoad and Assign FittingsGo to Cable Tray Fittings in the project browser.Load all required fittings (elbows, tees, reducers).Edit the cable tray type and assign these fittings under routing preferences .Duplicate and Configure Tray TypesSelect an existing cable tray type in Families > Cable Trays.Right-click and choose Duplicate.Assign the loaded fittings to this new type to ensure proper connectivity .Check Elevation and AlignmentEnsure all trays are on the same level or use vertical bends for risers.For complex vertical connections, create a horizontal run, adjust elevation, and add elbows manually if needed .Transfer Project Standards if NeededOpen a default Revit electrical template.Use Manage > Transfer Project Standards to copy cable tray types and settings into your project . By following these steps, most connection issues with cable trays in Revit can be resolved, ensuring proper routing and system integrity.