Thank you, Wrenches, as always for your spirited dialog. It has been a common practice of our company for a long time to pair MC4 connectors and PV wire for commercial 1000v systems. In a recent install the crew wasn't properly informed and they employed Buchanan crimps (as is our standard < 600v residential solution). A QA/QC contractor happens to have a very, very close eye on this project and has requested the submittal of the Buchanan spec sheet. This is what prompted my question to the list.
I'm not going to lie, I was hoping Mr. Mehalic was going to answer the question with something along the lines of '*a rooftop j-box qualifies as a fixture and you're good to go*' but I was equally prepared for "*I do think the text on the Buchanan spec sheet in regards to voltage makes it a no-go for 1kV+ systems*". I wasn't expecting the tangential discussion about the use of MC4 connectors inside a junction box and I'm going to have to weigh the pros and cons of them in this application carefully. That being said, in a decade of performing installations doing precisely that, I've opened plenty of them up years later and been very happy with what I've found inside looking neat and tidy. And I can't think of a single arc fault in such a scenario that wasn't directly related to someone improperly torquing the connector. Cheers, Sam
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