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Autocad MEP has ladder cable tray that can be found in the electrical workspace on the cable tray and conduit tool palette tab. Please note that all cable tray looks the same in Autocad MEP. (A solid) The only difference between the types of cable trays are they names.
The cable ladder, cable tray and cable trunking that comes with AutoCAD MEP are not any of those things, they are ducting with a different name.
There is no E in MEP!!!!