Having owned two older houses, 1926 and 1937, I have had the need to do a good deal of wiring. I always make sure that anything I do meets or exceeds code. Only once was I questioned when selling a house, I had used a LARGER guage wire, , 12 instead of 14, and 14 was code. I had to point out that 12 was probably over kill, a friendly cup of coffee and some conversation took care of the issue.
My fall back reference for alot of electrical questions is Home Depot’s book “Home Improvement 1-2-3”. Remember providing 220 VAC to a table saw is no different than providing electrical for an electric stove.
If you are rumming conduit, I get information on numbers of conductors, etc, at www.teicontrols.com.
-- Bill, Michigan "People don't come preassebled, but are glued together by life"