Feeder Size Question for Solar Inverter

[tmillard]

I have a quick question regarding a future solar installation...

I have a 100KW solar inverter that is feeding the supply side of a switchboard rated at 3000A 277/480V 3 phase 4 wire. I understand the supply side connection is permitted by 690.64 which references 230.82(6). Since it will be connected ahead of the main 3000A circuit breaker, it is planned to install a 200A fusible disconnect switch with 150A fuses. My question is in regards to the feeder from the fusible disconnect switch to the inverter. Based on Table 310.16, I believe the feeder should be 4#1/0 with a #6 ground. I was told the neutral and ground should be 400mcm (based on the 3000A service) but I do not believe this is correct. Does anyone have any input on this?

Thanks,

Tom

 

[don_resqcapt19]

The feeder conductors and the associated EGC between the disconnect and the inverter will be sized based on the 150A fuse. The grounded conductor will be sized by the calculated load or 215.2(A)(2).
The supply side equipment bonding jumper between the 3000 amp switchgear and the disconnect will be sized per 250.102(C).