@signmeup Boy, did you hit some GREAT points!!!
Keep at it. I also think we may have used the same vendor on a cabinet. Something very similar happened to me once.
In general:
In my state there are two types of "electricians." Sign electricians and general contractors. Sign guys cannot do anything but wire the sign and stub out. That is the extent of their electric parameters.
Our state law says that a sign has to be on a dedicated circuit. Sign electricians can't wire a panel to meet that, only a general electrician can. So, the general electrician wires the panel and extends the terminal to the sign where the sign electrician can hook it up (or either of them can hook it up but it is preferred that the general electrician do that). Fair enough. EXCEPT - the general electrician could conceivably install, wire and hook up neon and other high voltage without a clue as to code as they have zero experience or training. They are clueless to simple things like the difference between wet, damp and dry and what the regs are on each. Yet there is nothing within their electrical test that I have ever seen that even quizzes them about sign electrics, much less neon. A disaster waiting to happen. The law and code should be a two-way street. The law/code should have a sign guy responsible for the internals of an electric sign and not allow a general electrician to mess in that area. I rant, sorry.
As to electricians in general. I happen to have a good one as a neighbor. He is also a top-of-the-line estimator/planner. I once asked his advice on a build. He was wise enough to tell me that he knew nothing of signs, especially neon, and find someone familiar with those codes as they are intricate and for the most part a bit confusing (at least to him). If they were not a bit confusing at times I wouldn't have the need to try and solicit some free advice...lol.