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Automatic Transfer Switches in Revit

Thursday, July 11th, 2019

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.


  1. Open the family for the ATS you want to use.
  2. 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.
  3. (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.
  4. Select the ATS and run the Revit Modify | Electrical Equipment->  Power command. You will be asked to select a connector.
  5. Select either connector from the list and press the OK button to create the first power circuit.
  6. (Optional) Connect the circuit to a panel using the Modify | Electrical Circuits ribbon.
  7. Repeat step 4 to create the second power circuit. You will not be asked to select a connector.


When you select the ATS, 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.

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