Wire sizing

A

AndrewGia93

Member
Location
PA
Occupation
Electrician
Running a new service to a pole barn about 500 feet from a ct cabinet. 200 amp 208 3 phase and the load calc for the building is a max of about 140 amps. Not really getting too much help from engineers or township to for my calculations on wire sizing. Trying to run aluminum wire. Thoughts?
 
AndrewGia93 said:
Appreciate it! In this situation would you calculating according to the full 200 amps or estimated load
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Your choice. Depends on how much you want to allow for future loads.
Once you run the numbers whoever is paying will likely lean toward estimated or calculated load and not the full 200.
 
3* 250 kcmils aluminum conductor 75oC, in a 4" conduit, underground [ρe120 W.cm/oC-in NEC it is only 90], may be loaded with 200 A. However, if you limit 3% voltage drop, then you need 750 kcmils for 500' length.
 
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