Spark Master,
Just remember that in a single Phase circuit, the Neutral is a Return conductor, to the Neutral busbar.
I have been shot down, here before, for calling the Neutral a return conductor, but, that's what it is.
Only in a 3 Phase Wye(Star) system, does the Neutral, carry the out-of-balance current.
However, if you do happen to cut a bunch of Neutrals at a fitting(light fitting),that carry return current from other circuits, you are in effect, dealing with Phase wires, because, unless that wire is tied to a Neutral reference, it becomes a Phase wire.(Basic Electrical Theory) [Linked Image]