The cubicles (18 total}) have a main plug which is plugged into the wall outlet if that matters. And I'm in a data center as well, so the limiting thing could be possible.
All I know is What I experience at home with my G4 or G3 charger is twice as fast as in my cube.
Yeah, that does matter. Because it's a datacenter, amperage might be artificially limited to help protect the power grid there. Mostly from rogue or defective devices.