This was posted previously last week and I responded but I'm not sure what I said was very definitive. I have since asked around and looked at the code again and here's what I belive the code says:
220.19 (2002) and 220.55 (2005) and their associated tables are for calculating the load(s) for branch circuits, feeders or services.
The other code reference 210.21(B)(4) tells us that we can size the receptacle based on 220.19 ('02) or 220.55 ('05) so if we size the receptacle using this approach we more than likely would size the rest of the circuit this way.
Also look at Note 4 for Table 220.19 ('02) or 220.55 ('05) and you get a sense of how a branch circuit for a single range is sized.
The code also says that for a 12KW range the receptacle can not be less than 40a.
8000/240=33.3 but we must use a 40a. wire and overcurrent and I think a 50a. receptacle. I don't believe they make a 40a. receptacle
I would like to hear from others as to my error or lack thereof.
[This message has been edited by George Little (edited 01-28-2007).]