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So the first part was easy. 3 separate runs per phase 600/3=200amps. Table 2 75 degree column you get 3/0 awg.
Then I went to table 10A area of 3/0 R90EP is 227.5. Now I multiplied that by 3 as it specifically says in the question 3 conductors per phase. which gave me 53mm conduit but in the reference it says they multiplied it by 4. I'm wondering why? Is it just a ground that's unaccounted for in the question?
 

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