Revit 2018 Circuit Path Bug

Revit 2018 has a new feature for the electrical discipline, which allows the designer to develop a custom circuit path. This is done between the Panel and the Farthest Device. Previously, Revit would would only use the X,Y,Z of the connector at each end and a fixed offset from the level (this is still the default).

The circuit length is used to calculate voltage drop. Calculating voltage drop in Revit is still not always possible due to the way it automatically assigns wire size. I wrote about that here: Revit Idea: Change how wire is auto-sized or allow override for engineering judgement.

Turns out there is a bug in how Revit calculates circuit length...

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