The Adjust Conduit Radius command is used to adjust the bend radii of one or more conduits. This can be used on offset conduits to make the bends concentric rather than staggered.
To adjust the bend radius of a conduit, go to
Ribbon: DM Electrical->3D-BIM-> 
Adjust Conduit Radius
Pulldown Menu: DM Electrical->Conduit->Adjust Conduit Radius
You will be prompted to identify which conduits have radii to be adjusted.
Select conduits to adjust radius on:
The Inside Radius dialog box will appear.
The radius specified in this dialog box will be used for the inside radius of bends in the conduit. With multiple parallel conduits, this value is specified for the conduit that is on the inside with the smallest radius. The bends in the other conduits will be adjusted so that they have the same center point as the inside bend.
Select the desired radius criteria and press the OK button.
The conduit bend radii will be adjusted.