750 MCM Aluminum good for 400 Amps?

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l3city

Senior Member
Hi fellas, I have a 400A/3-phase panel. The length from the Service to the panel is 350 Feet. The voltage system is 120/208V, 4-wire. The feeder runs underground in PVC-40 conduit. The ambient temperature in in this place is about 120F.

The electrician says it is safe to feed this panel with a 750MCM aluminum to cover for the 400A Panel. After my derating factors and votage drop I find this 750 MCM Aluminum feeder to be good for about 356 Amps (.82 x 435 Amps per NEC table 310.16 and Temperature correction factors) and without considering the 350 Feet voltage drop.
Is this correct?
Thanks ahead for any input
 
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