Good spot
@Brad_S. I want to believe, but analyzing the pic, I see 8 AC cables; Bear with me.
By looking at a single line diagram from a public permit application for a
different site, if this was a supercharger tie-in, it would mean that the utility already installed the switchboard/breaker panel. I’m surprised this would be in their scope but it’s possible I guess. The picture would suggest Brandon is getting 8x supercharger cabinets for 16 charge posts, not 6 posts according to supercharge.info. Is there room for 16 bays? Perhaps the colours mean they’ve run two parallel cables for each circuit rather than one fat cable per but I don’t know if that would be code compliant. If so that would service 4x cabinets for 8 bays.
Next: cable thickness. Each cable should house 3 line conductors, 1 neutral, and a ground. For current gen superchargers, it means ~ 300MCM for the 3 lines and the neutral would mean 4x ~0.5” diameter conductors. The ground should be about the same size. Did those cables look thick enough to you to accommodate such conductors? It looks possible from the pic.
It does look like a fat enough transformer, maybe ~ 1MVA. (There should be a data label on it in case you’re out there again) That would accommodate 8 superchargers (16 posts). Or if the switchboard is integrated, maybe it’s a smaller transformer for 4 superchargers and they double-upped the conductors.
I really hope this is it, but I don’t know how to reconcile the cable count in the pic with the bay count in supercharge.info.