So much of this seems odd to me, coming from an electrical engineer...
The installation is unusual.
High voltage cable comes into a switch in a basement electrical room. The switch has three taps. One tap feeds each of three lines. The high voltage cable goes through tunnels to each of two other electrical rooms. It is landed in gear containing a transformer that steps it down from 13.8KV to 208KV. The same line-up contains the distribution - which is partly through bus duct. So the input in each MDP is 13.8KV and the output is 208V. It is old and strange. I didn't do it.
I was referring to separating the three parts of the transformer so there would be three hunks of metal to get rid of and not one. Didn't think I'd brought up the bus duct?
I get the impression you have your dukes up, wanting to spar. I'm not much for sparring. I was asked why I thought I could get equipment in if I couldn't get equipment out. The answer basically is, "Because it is different equipment going to a different location."
There are no clear and universal definitions for high voltage. There have been many online discussions of this fact. If you are an electronics engineer then 120V is high voltage. If you are a utility engineer then high voltage is probably over 100KV for you. If you are not a utility engineer, then medium voltage probably has no meaning. My definition is that if the NEC classifies it as over 600V, then it is high voltage. Low voltage to me is 24V or therabouts - communication or control wiring that is not line voltage. In between, I call it line voltage. I don't use the term medium voltage, except to ask someone else who is using it what their personal definition is.