Doug does a fine job of explaining the use of EMT in wood framed homes in this area. I just wanted to add that sometimes if the horizontal line for the conduit runs to an outside corner (inside the house), you can drill an extra hole or two and use lengths longer than 30". I usually think of these after I install the 30" pieces. It takes a lot of imagination and I have a lot of respect for the guys that do it. As in most work, after you've done it for several weeks, it's easy.
Dave
