Thanks for the replies.
Disconnect is a good question.
The application is a public park where the power for the lighting is un-metered direct underground from the utility. There are existing poles which we are replacing.
Presumably the utility has a disconnect and perhaps circuit protection in their manhole. I don't know.
Anyway - I would think fuse protection and a disconnect at the poles would be prudent.
Some those kind of situations you might want to make sure there is EGC's run. Municipal power companies (city owned POCO) I have been around are POCO linemen and don't know NEC, yet they often do wiring on city grounds, especially parks and similar. Seen many NEC violations over the years in those applications. Such lighting like OP is dealing with is common to not have proper overcurrent protection and to use the grounded conductor for equipment grounding. If they do it at top of wood poles for area lights, maybe still wrong, but the general public is not going to come in contact with that fixture arm if it is energized like they can with a metal light pole.
If you want to make some modifications to something existing, take everything that might be wrong with it into consideration and maybe even say if we don't change this list of issues I don't want the liability for anything I might do.