Q: How do I model an automatic transfer switch in Revit? Will it work properly with Design Master Electrical RT?
A: Automatic transfer switches can be modeled as long as the family and power systems are configured properly:
Figure 1: An ATS
with two connectors.
- Open the family for the ATS you want to use.
- Confirm that the family has two connectors, similar to Figure 1. If not, add a second connector using the Revit Create->
Electrical Connector command and configure the new connector’s properties. - (Optional) If you had to make changes to the family, load it into the project with the Revit
Load into Project or 
Load into Project and Close command. - Select the ATS and run the Revit Modify | Electrical Equipment->
Power command. You will be asked to select a connector. - Select either connector from the list and press the OK button to create the first power circuit.
- (Optional) Connect the circuit to a panel using the Modify | Electrical Circuits ribbon.
- Repeat step 4 to create the second power circuit. You will not be asked to select a connector.
Select the ATS, then go to the Electrical Circuits ribbon (not the Modify | Electrical Circuits ribbon that appears when you create the circuit) and select the System Selector dropdown menu. You should have two systems to choose from (they may appear as <unnamed> before you connect them to a panel):
Each system can be circuited to a separate panel. When you run the 
Panel Edit command, both connections will be shown in the list:
Select either connection to configure the ATS. Feeder and upstream connection settings will be shown for both connections.