I realize that this is an old thread, but I thought I'd reply so that it might be useful to others searching for this information. Here is the method to redirect the project scratch database files in AutoCAD Electrical 2013. For other versions, the path locations will be the same, but the names will vary slightly.
Start with some of our most frequented solutions to get help installing your software.
The AutoCAD Electrical forum has moved into it's very own category page, and can no longer be found within the Additional Product Forums.