I am feeding three 200 amp mains from a 400 amp meter. These will be feed from the meter via a 6"x6"x48" raceway immediately next to the meter. Each one will have it's own run of copper THHN from the meter. Will 3/0 THHN copper be sufficient considering the "fill" of the raceway. Also does the nuetral need to be 3/0 or can I go smaller.
Also, this service load will travel from each main, underground a distance of 10 feet. Then up a pole in sch 40 pvc to seperate laterals feeding several different load centers. (this is on a farm to feed grain dryers and a shop) If I were to use 3" pvc up the pole and 3 seperate runs of 4/0 URD, (one from each main) Can they all be in one 3" conduit?
This is any existing service upgrade, so this is what I have to work with. The reason for using 3 mains is; 1) to be able to isolate areas for repair without affecting others, and 2) due to the cost difference of a 400 amp 3R main breaker enclosure. $400 vs $2000
Thanks for the help
