Rob, let's look at your question closely.

First of all 215 is for feeders so we will leave this section and go on to 225.7(B) which will allow you to put as many circuits as you want on a properly sized neutral. Yes this section is specific to "Outside Branch Circuits and Feeders" but there is nothing in any other section prohibiting it for other applications.

If you are using a neutral conductor the same size as the circuit conductors, then you could have a neutral common to both ends of a single winding, (transformer) or common to three windings connected in a wye or star configuration. This goes with Cpalm1's post

I know, I'm causing trouble. [Linked Image]

Roger

[This message has been edited by Roger (edited 01-13-2004).]