This Revit tutorial walks through building electrical power distribution systems with transformers and panel boards in revit, covering essential tools and techniques for your projects. The electrical distribution settings can be found under Manage -> MEP Settings -> Electrical Settings The first thing you need to do to set up your electrical distributions. The distribution system is set to 120/240 Single phase 3 wires and L-L Voltage 240V and L-G Voltage 120. If I change the 3 Wire to 2 Wire then I can assign the 120/240 Single distribution system.