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How do I resolve an Isolated Branch error message?

Overview: When the Demand Load Analysis runs, the following messages may appear in the Study Messages dialog box to indicate there is some type of input data error.

Error Message: "Error, Isolated Branch, Check Report."

Reason: There are branches in the system that are not connected to a swing bus. For instance, if a single branch is placed out of service, and if the components below remain in service, then you have an isolated branch.

Solution: Check the system for components that are placed out of service by mistake.