The Turn Double Line and 3D Layers Off command turns off the double line and 3D representations of conduits and cable trays.
To turn off the double line and 3D conduit and cable tray layers, go to
Ribbon: DM Electrical->3D-BIM-> 
Turn Double Line and 3D Layers Off
Pulldown Menu: DM Electrical->Layer Management->Turn Double Line and 3D Layers Off
The double line and 3D conduit and cable tray layers will be turned off and not 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 Frozen.