That's correct, although you could run 14-2 NM cable for a 240v/15A circuit. Remember that the box fill requirements are such that, if you have 10/2 going into a box to supply a receptacle and then heading out to feed another box/receptacle - you'll need at least an 18 cubic inch box. The same thing with 12/2 would require a 16 cubic inch box.
Thats correct. I don't have any equipment that currently needs 240v/120v, nor do I have any planned purchases that need 240v/120v. But, I hate doing drywall enough to put the extra neutral there just in case. The cost wasn't that big of a deal for me since the runs were short. Additionally, I liked the fact that I have red / black wires running to my 240v machine. Using the neutral as a hot conductor requires marking the end of it (tape / permanent marker). In my over-engineer-everything opinion, it can always come off or wear away over time.
Last edited by Rob Steffeck; 03-08-2010 at 1:47 PM.