Medfinder you may wanna research that a little more. There could be a wild leg in the mix. It could be from 208 to 277 v. Not all 3 phase is created equal.
And being that this was a mechine shop there could be 480 volts and a step down transformer.
she showed the basic set up of the service & i didn't see any transformers or lines running to what could be one . so i'm thinking is just a 208/110 3 phase service with a subpanel on the other end of the shop .