11x17 inches, a.k.a. ANSI "B" sheet. Also popular in the past, and still used in some places, the ANSI "D" sheet which is 34x22 inches. But the 11x17 B sheet is what I see more of today.
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.