Here is a glimpse of the transformer room at the Niagara, Lockport, and Ontario Power Co. generation facility. If you look closely; you can clearly see M-3250 holding the buss bar system coming out of the transformers going to the substation/ switching station located outside. You would logically think the engineer(s) would have used the hulking M-3890! However, they probably used the M-3250 because the bus bars were located inside protected from the elements; needing less insulation value.