In addition to support issues described by sc, the width of the NM cable would have to be considered in order to satisfy raceway fill, per "Notes to Tables" in Chapter 9.
What size tubing? What size NM?
In my opinion, it seems amateurish to attampt to install romex in raceways.
Single conductors is the proper way to go.
[This message has been edited by Redsy (edited 03-12-2005).]
