It is a normal metal building on a concrete slab. standard construction
HOLD UP, no center taps. yes, these are the pole transformers/ POCO xfmrs. 480V 3 phase. the secondary of the pots has ONLY 2 connections. #1 is to the other 2 pots and then ground #2 is to the 3 hot wires to the millThis is the pole transformers that you are mentioning?? From the utilities??
The Center tap does it have a bare conductor to the shell with a taped conductor/that circular runs behind the pole transformer to attach to a lower common wire, per transformer?