A couple of topics here got me to thinking some more about multiple services to a building.
Suppose you have a commercial building fed with 277/480V Wye. O.K, so perhaps in most cases there would be a customer-owned xfmr to get local 120/208 service, but what if the PoCo provides a separate 120/208V Wye (or a 1-ph 3-w 120/240V supply).
If the NEC requires neutral-ground bonding at each main panel, how does the PoCo feel about having the neutrals of two different services effectively connected together in this way?
