I've had some E-mails about my comment, so let me elaborate on what I am trying to say. The only interpretation of the NEC that is a legal one comes from the CMP's of the NEC, not from any other party. Any other opinion is just that...an opinion. No different than yours or mine legally.
In no way do I mean any disrespect to the IAEI or the author(s) of their publications. As I stated before, I am a member in good standing with the IAEI and appreciate all that they have done for the industry.