New 200 Amp Three Phase Service aprox. 180' from the main to new location.
2/0 or 3/0? THHN. NEC seems to differ according to Degrees. It seem that THHN is listed at 90 Degrees, so should I install 3/0?
Interesting that the OP refers to it as a service feeder, and that it comes from the main.
That would imply to me it is not really service equipment.
If this line qualifies to use Table 310.15(B)(6) then 2/0 is acceptable.
Isn't that table for single phase dwellings?