Originally Posted by Roger.
Are you using the term BX to refer to MC, AC, or both? Do you know the difference between the two different cable assemblies? It's obvious (from what you aere telling us) that your clueless inspectors don't.
I think what is misunderstood here is that the Chicago Code places final authority with either the inspectors themselves or their supervisors. If this does not solve the interpretation problem then the electrical department is next in line to determine the application and type of application of the code. Lawyers fight for the hard headed contractors who are willing to spend for law services to fight for their point of view. The Chicago code is strict but not inflexible. The Chicago code is not the NEC as the NEC standard does little to allow solving of difficult and unique problems In a unique industrial/residential city. The Chicago code allows for many exceptions unique to its needs.
Here in Chicago we have very competent inspectors and supervisors and only a few with limited insight into the complexity of a city that was a true western frontier when founded and an electrical system that dates back to the late 1880's. There is even a long ongoing turf war with OSHA where the federal authorities try to exert their authority to high rises and are blinded sided as often as possible. The Chicago code is Chicago determined.
Meggs Field airport's tarmac was destroyed even though the feds warned of severe consequences if the city done so. The Feds LOST!!
Chicago has always seen itself as a city state apart from state and federal authority if it ran counter to the city's interest.
Local vocabulary makes posting on a national forum a sure source of confusion. I find that this forum is often moot when it comes to Chicago electrical code problems. This explains the lack of Chicago electrical contractors as participants.