Sorry. I'm not exactly sure what you are asking. There is no PDU there. The building installed this patch panel simply as an available cabinet location to house low voltage Ethernet connections. It looks wrong and out of place to me. I am trying to figure out if it is an acceptable installation within NEC. Maybe it was OK in the 90's but not OK now. Or maybe it is just fine since there is a metal barrier between the low voltage and high voltage circuits. I can't find an applicable code after spending a lot of time searching.
The drawing shows twist lock receptacles along the bottom of the cabinet, one for each 3 pole breaker. That would indicate that this cabinet was intended for the connection of portable cords to some temporary equipment. Could be reefers in parked trailers as an example.
At any rate, you are you saying that you know that this patch panel was installed in this cabinet by someone from the building who was just looking for a good place for it?
I still say that the inner cabinet is "the" electrical cabinet.
Yes, probably, but I suspect that that side gutter had a legitimate purpose in the design of that PDU like the feeder wiring. Have the twist lock receptacles been removed? I suspect yes since you would have noticed them.
If so, these modifications would void the listing of the panel. IMO it shouldn't even be used for an electrical panel.
-Hal