In the Electrical workspace, click Manage tabPreferences panelCable Tray . To specify a cable tray pattern, under Cable Tray Pattern, select a type of line pattern, and enter a value for Spacing. To assist you, the preview image on the right provides an example of the current selections. Save time and. Discover Autodesk Revit's RVT format for our T&B cable tray BIM files. Access and download T&B cable trays Revit files for free now! Find and download Intergraph Smart 3D CAD VUE files for. Annotating Electrical System Drawings The topics in this section describe how to create and modify panel schedules for your electrical drawings. For information about annotating the drawings using other elements, such as labels, tags, and documentation symbols, see Creating Construction Documents. If you're working on MEP coordination or electrical shop drawings, this Electrical Installation Detail DWG Package is a must-have resource for consultants, draftsmen, and engineers. These DWG files provide a full range of electrical system installation details, including cable tray supports, power. Note: You can build two sets of panel footprint symbols, one set that does not carry the target attributes for wire information and a set that does. When you insert your panel symbols from the schematic extract, select Use Footprint tables to access the first set of symbols or Use Wiring diag.