If I can revive this thread, I have a similar question. The way I'm reading 690.15(C), it seems that all combiner boxes have to be disconnecting, even if you have a SolarEdge with Rapid Shutdown kit installed. I've been hearing everyone talk about 690.12, but this seems equally as huge, and I haven't heard much about it. If I have a solution that doesn't need a disconnecting combiner box for Rapid Shutdown, do I still have to have a manual disconnect in or within 6' of the combiner? Does it pertain to pass thru boxes as well?