Wiring is ultimately only a logical connection property, and the annotations are only there to illustrate the logical connection.

Estimating the length of wiring that is required for a power circuit is a popular topic in the electrical BIM world. There are various methods that are usually proffered.

You can use Dynamo to add the delta X, delta Y and delta Z between the sequential insertion points of the electrical fixtures.

You can model conduits and use them to schedule wiring lengths instead of the wires themselves.

My preferred method is to use the circuit path to represent the wiring lengths. The pathing methods are limited, but for length calculations, probably sufficient. You can alter the layout if you select the circuit and edit the path.

You may then alter the layout of the circuit. As you can see below, the length is available from the properties of the circuit.

Create a new schedule for the electrical circuits.

A filter is applied to show the circuits on a panelboard. Note how the 3=pole circuits require 3 live wires (one for each phase).  

Also note that the wire symbols allow one to show a home run as two live wires for combined circuits, but that the schedule does not. At best the wiring diagram then shows the intended circuit wire runs.

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