Our utility has been using a standard chart that lists various jobs at various voltages to show requirements for PPE. I'm not sure what the document is, but the only jobs requiring Class 3 acrflash PPE is removing a bolted cover from energized 480V panel and pulling an MCC bucket in an energized switchgear. But...while I was working there (now retired) the meter techs were required to wear Class 3 (40 cal suit and 20KV gloves with protectors) when pulling 480 meters and FR shirts, face shields and secondary gloves when pulling lower voltages. Same for installing test bypass jumpers. If in a CT compartment installing test equipment, same rule. I asked for studies, but it never was done. They may have done arc flash studies since I left, but I doubt it. All of the multi-voltage solid state meters I have seen show the voltage on the display, but I put orange stickers on the 277/480 and 480 3W meters anyway just to be sure we knew what we were getting into. In my humble opinion, pulling energized meters is a VERY dangerous job, because you never know what's happening behind the meter. Loose jaws, missing cover screws, etc. can cause mucho fire. Ask me how I know!