+1 Rural areas can get really interesting really fast...
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I think that is part of the divide on this discussion. It is easy to just get a licensed electrician when your in a decent sized metropolitan area. When your an hour from the nearest thing resembling a town there are no electricians. The rules start to become more of a political/popularity contest. One of the most dangerous situations I ever saw was a county maintenance guy who threw his weight around and got bonus pay to do a "tie in." When I arrived I found an open door to a room with some soow 6-3 laying on the ground. One end was running in the panel to a 50A breaker that was ON. The other end was open ends, laying on a wet cement floor inches from a copper water pipe feeding 2 public bathrooms. WTF!!!
I have also run into my share of licensed electricians who did not know shit about electricity, history of power distribution, and other knowledge needed to make safe and clean power available. I was talking to one of the supervising electricians for a theatre upgrade I was involved with about older 3 phase systems. He said most of the young electricians under him knew nothing about the old or odd 3 phase systems.
I think it is important that we, as production professionals, at least learn to recognize the various power configurations and potential safety failure points. We may not be certified or hold the licence to "fix" the problems. However it is our responsibility to recognize and be able to articulate to others what problems we find.
Terms like qualified, competent, certified, and licensed have very specific meanings when dealing with NEC, OSHA, insurance, and other legal situations. https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10618
We should, at a minimum, strive to meet the definitions of qualified and competent. This means getting training and experience. We also have to understand our local laws. Where I use to live I could do any electrical work I wanted to my house, including the main feeder and meter base, as long as I had a permit and it was inspected. In the next town over I could not even replace an outlet. Where I live now I am not allowed to install low voltage signal lines with out a licence. However, I can legally do a tie in to a 120/208 400A disconnect with out a licence, if the venue allows.