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
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