3-Phase Max Allowable Backfeed

[kmcabee]

So I've got a 3-phase system that I am in the process of designing, and this is my first 120/208 3-Phase system I've had the pleasure to work with. The main breaker is a 600A and there is a 225A breaker feeding the sub panel that the solar will be feeding in to. Solar wise the system is going to be a SolarEdge 14.4k so I'm only looking to push 50A of backfeed. Now do 3-phase panels use the same 120% rule like a typical residential single phase main would? Or is there another way to calculate the max backfeed? Any feed back is much appreciated!

 

[ggunn]

So I've got a 3-phase system that I am in the process of designing, and this is my first 120/208 3-Phase system I've had the pleasure to work with. The main breaker is a 600A and there is a 225A breaker feeding the sub panel that the solar will be feeding in to. Solar wise the system is going to be a SolarEdge 14.4k so I'm only looking to push 50A of backfeed. Now do 3-phase panels use the same 120% rule like a typical residential single phase main would? Or is there another way to calculate the max backfeed? Any feed back is much appreciated!

Yes; 705.12(B)(3) still applies.

 

[kmcabee]

Okay, Great thank you!