Recommend getting a copy of NFPA 70. Read Article 130. Without seeing the area arc-flash assessment, I'd say you are looking at PPE Category 1
Standard work apparel:
Arc-Rated clothing, 4cal/cm^2
Hard hat
Safety Glasses
Arc-Rated face shield
hearing protection
Leather Gloves
Optional: rubber gloves and leather protectors
You are correct, for 240V and below, some electricians won't use anything other than their normal FRs, a hardhat, and safety glasses. Of course, unless the panel/transformer are something strange, the SCC is rarely more than a few thousand Amps. And they know that.
Recommend to take an NFPA 70E class. Interview the instructors. Some (most?) are terrible. Too many show endless pictures of burned up electricians. Yeah, we got that - it's dangerous. What we want to know is: How do we mitigate the risk? Your class is not helping.
Get the company to pony up for the electricians to take the same class.