Steve;


230-2 Number of Services.
A building or other structure served shall be supplied by only one service unless permitted in (a) though (d).

For the purpose of section 230-40 Ex #2 only, underground sets of conductors , size 1/0 and larger, running to the same location and connected together at their supply end, but not connected together at their load end, shall be considered to be supplying one service.

as i see it, you need to define 1 or 2 services before you can really start on your other Q's.

why does the code make OH & UG a difference here, i'm sorry i can't say.

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