Well I am still not clear where the service point and service disconnect are, and it's hard to establish Much of anything without knowing that. You can't connect a customer transformer directly to the utility. A transformer isn't listed in 230 as something that can be on the line side of the service disconnect.
Since the power is being generated on site, where does the service disconnect get placed?
I would like to clarify here that initially we did not have a disconnect on the primary side (4kV side) of the transformer. But we realized we needed a primary protection according to NEC 450.30 and the one line was later updated. We also have a main disconnect for the solar system (89L) on the secondary side (480V side) of the transformer. So the setup is basically Inverters -> 52IT -> Meter -> 89L -> Transformer -> UtilitySeems odd that there is no meter or 4kV disconnect shown on the 4kV side of the transformer.
How do they get reimbursed for the generation or disconnect to maintain the transformer and balance of system?
If the utility wants the wire sized per their standards, we are just guessing how they come up with the size they do because they do not follow the NEC.