Here in NJ the state adopts sec. 90 of the NEC with some editing. We change the words AHJ to electrical sub code official. That gives us the power of the AHJ. As for 90.4 myself I try to interpret the NEC as written, but as always you and I can see things in a different light. I then welcome the EC to engage in conversation with me. Tell me what he thinks and I will tell him how I see it. If I think he makes a good point, I can agree with him. As Greg says, I have brought many questions to this BB because I get a lot of questions from EC's out there. I also want to see if I am missing a point or two from the EC.