Currently Revit does not allow a circuit path to have a T, or splice connection. The path goes from one device to the next, in series. However, it is very common in real-world installation for circuits to be spliced where, from a single point the circuit will split into two or more directions. This is done both to mitigate voltage drop and for easier, more practical installation. Without a way to model a splice in Revit, it's not possible to calculate voltage drop accurately for branch circuits based on real-world installations. My proposal is that a splice functionality is added to the circuit path in Revit.