I failed an inspection this week after running 4/0 AL SER through bored holes in 2x12 ceiling joist of a garage. Myself, and 11 other people have been combing the NEC trying to find the violation and have yet too. This particular inspector is known for being the know it all type, and NEVER lists code articles for areas of concern. If anyone can shed any light on this it would be much appreciated. Thanks.