705.12(B)(3)(6)

[jaggedben]

So @Gridtied, just to be clear...

The PV point of connection being in the downstream sub, no additional protection for the 3/0 feeder is needed. The most it can see is 150A one direction or 31.05A the other. This is why 705.12(B)(1) only applies to connections made "other than at the opposite end".

 

[Gridtied]

Thanks for the help. It still seems a little fuzzy, but what Wayne is saying is that with the PV source CB downstream in the distribution panel bus, the feeder in between the 2 busses will not see anything more than what the primary power source is able to send, which would be 150A. There would be no circumstance that the feeder would see more than 150A as the MB is 150A.

 

[Gridtied]

So @Gridtied, just to be clear...

The PV point of connection being in the downstream sub, no additional protection for the 3/0 feeder is needed. The most it can see is 150A one direction or 31.05A the other. This is why 705.12(B)(1) only applies to connections made "other than at the opposite end".

Yes. It does make sense now after seeing yours and Wayne's input. I kept thinking that the feeders would see a higher ampacity, when in fact, they would not.

 

[ggunn]

When you ask a question and provide a drawing, it really helps when the question relates to the drawing.