This note is highly deceptive and has several flat out falsehoods.
https://hughesautoformers.com/run-your-autoformer-with-confidence-a-note-regarding-nfpa70
1. NFPA 70 starts as 'recommendations' and then is made law by cities and counties individually across the country. Some will make minor changes, a few do their own thing. But once adopted it's as legal as speed limits!
2. NFPA 70 is written not by 'a few board members' It is written by a many committees of industry experts, and then passes through a rigorous public review. In fact the whole process is extremely public with constant input. You can go read the discussions on the topic and get all the information anyone could want.
3. 2020 is the current version, not some idea for the future. The next version is underway and due May of 2022. The whole thing is done every 2 years.
4. The Hughes transformer is a rare type of autotransformer. On winding or 4 is of little importance. They are fine having their own name, but the NEC and I are simply using a generic term that would apply to any similar device by another company.
5. Electrical engineering is far more complex than presented. The short version is that such devices lower everyone else's voltage. Maybe one in 10 is OK, but 3 in 10? More? Overheating wires throughout the park IS a hazard.
The correct solution is to properly engineer the park system. Park owners resist this answer due to the costs. Yet we all suffer with the danger and poor performance of inadequate power.
Please don't make it worse!