Codes aren't law until adopted by the government that has control of the real estate where the building is located (the AHJ). The 2003 IRC chapters 33-42 are based on the 2002 NEC (and authored by the same NEC folks). If your AHJ has adopted the 2005 NEC, and you are using the 2003 IRC, then you may be missing some important items. Are you using the 2006 IRC?, then you are on the same page as the 2005 NEC.
