Ok so you are saying the AHJ has nothing to say about oh lets say a fair or carnival?
Not part of a building at all, entirely temporary in nature.
An interesting side story... several years ago, I was the technical director for a small Chicago theater company. For those that don't know, the TD's job is to manage the technical aspects of a production. Lighting, sound, wardrobe, etc... are left to others (though the TD often coordinates interaction between departments) but the TD is responsible for the set's construction (among many other things). The TD is also often the point of contact with outside vendors, authorities, etc... The production had several "fire" elements in it. Nothing more than a couple of scenes with a lit candle, but Chicago is still quite twitchy about fire in theaters.
However, in order to meet the requirements of the insurance for the theater space we were renting, we had to arrange a visit with the fire inspector. As TD, that job fell to me. I knew him from earlier productions around the city, and once he saw that we had the required fire plan, extinguishers, and proper evac routes for the audience, he was happy to sign off. We got to talking when he noticed the rather large amount of in-set practical wiring on the set; mostly wall sconces and several functioning receptacles wired back to dimmers to control floor lamps.
The lighting was wired with SO cable, as is standard with theatrical wiring just about everywhere. Where needed, fixtures had proper back boxes, and cabling was neatly routed backstage. He told me that while the NEC states that "temporary" theater sets can be in place no longer than 90 days, practicality dictated that the time limit be waived, productions often run longer than three months. His office had decided that, so long as in-set wiring was done safely and neatly, the prohibition on SO cable in a "permanent" install wouldn't apply. They did do inspections, and damn sure expected everything to be done safely - grounded properly, no overloaded circuits or plugs, etc.. - but they weren't going to make everyone suddenly have to rewire their sets in EMT on day 91 of a show run.
I guess where I'm going with this is that the strange things we're often tasked with doing in the entertainment world often don't fit neatly into easily defined categories. The inspectors I've talked to in these instances have all been friendly, reasonable people, and I've found them to be able to come to a mutually agreeable and safe solution. As the Chicago inspector told me, "The NEC is supposed to be keeping people safe, not raking people over the coals. Creative solutions can still do that."
SceneryDriver