In the Cable Tray Layout Preferences dialog box on the Routing tab, under Cable Tray Layout Rise/Run, click Angle or Fraction. For Rise/Run, enter the desired value, depending on the format selected. SVG diagram for on-site marking. What is the Cable Tray Slope & Fabrication Calculator? The Cable Tray Slope & Fabrication Calculator is a field-ready tool for electrical construction workers who need to quickly calculate. Slope is applied to cable tray in the Z direction of the current coordinate system in the drawing (typically the vertical direction for a building plan). For licensed electricians, mastering these principles is essential. Cable tray (or cable ladder) systems are a popular alternative to electrical conduit systems, as they have an outstanding record for dependable service, design flexibility and cost savings in commercial and industrial applications. Use this tool to estimate sloped section length, horizontal run requirement, cut marks, and installation feasibility. Selecting a specific height will show cable trays with.