As politely as I can say it, and with all due respect, "you guys dont get it"...this is a HICK town...no AHJ.....no red tags....no engineer...no change orders.....it will not be inspected at all.............They will figure it out, and when they produce what I need, I'll hook it up...
Even in HICK town, Oklahoma there is a AHJ. He would be the state fire marshal in your area. Call down to the State Fire Marshal's office and request the the fire marshal in your district make a visit.
I did this on a job where there was no engineer, no designer, no nothing, just a redneck saying, "Here's what we want." I'll give you a little info. on this man's business. He designed and developed a propane system to go on over the road rigs to improve fuel mileage, emissions, etc., etc. This system has a valve that regulates the amount of propane to the air intake based on turbo boost pressure. When he installs a system on a truck he "fine tunes" this valve on each truck specific to each truck by putting the truck on a chassis dyno and running the truck at different speeds and loads on the dyno with the valve on a test bench and propane running to the valve he can adjust the valve until he gets peak performance out of the truck. The test bench is in a little room with the computer equipment for the dyno and there are propane lines that are active while this is all in operation. The dyno equipment is in NEMA 4 enclosures but they have vent holes in them for cooling proposes. These equipment enclosures are mounted below the test bench, at less than 2'. They have heat sinks, and relays and electronic circuit boards in them.
The journeyman that I had doing the project and I couldn't decide if this would be a classified location or not. So between the two of us we decided it would be best to involve the state fire marshal. We looked at the liability to our company if something were to happen. So we just very nicely explained to this man want the problem was what the liability to his company was (as he had already had trouble with his neighbors) as he lets his customers come into the shop area of his business (he confers with them while setting the perimeters on the valve). They also "drive" the truck while it is on the dyno. He was very open to having the state fire marshal come, his only comment was, "What will this cost me". When the Fire Marshal came out he said he would rather come before hand to know what was going on than to come post accident. He also said that if we/business man would do all that he asked then he would stand up in court for us if it ever came to that, but if we didn't........
So Mule, I think what I would do is have a talk with the maintenance supervisor and maybe his boss. Explain your position thoroughly, tell them of their liability exposure (to their employees or possibly neighbors). Tell them of your liability exposure (they may not care). But if you get the fire marshal involved now he will be on your (their) side if something catastrophic happens. Because if something catastrophic happens somebody will sue everybody involved, you, them and anybody else they can think of.
Hope this helps.