Q: How do I set a minimum conduit size?
A: Use the DM Electrical->Customization->Wire Sizing commands. There are two different ways you can accomplish a minimum conduit size. Which you choose depends upon your specific needs.
Conduit sizes are displayed in the grid in the top-right corner of the Wire Sizing dialog box.
Solution 1: Uncheck the “Standard” Boxes
There are two columns that control whether a conduit size is used when the conduit is sized automatically. Uncheck the Standard Branch column for conduit sizes that should not be used when sizing branch circuit conduits. Uncheck the Standard Feeder column for conduit sizes that should not be used when sizing feeder conduits.
Solution 2: Delete the Unused Conduit Sizes
Use the Deleted Conduit Size button to delete any conduit sizes below the minimum size you want.