The Turn Double Line and 3D Layers On command turns on the double line and 3D representations of conduits and cable trays.
To turn on the double line and 3D conduit and cable tray layers, go to
Ribbon: DM Electrical->3D-BIM-> 
Turn Double Line and 3D Layers On
Pulldown Menu: DM Electrical->Layer Management->Turn Double Line and 3D Layers On
The double line and 3D conduit and cable tray layers will be turned on and visible on the drawing.
If this command is run while in a paper space viewport, the VP Freeze setting for the layers will be changed to Thawed.