Got in touch with AHJ and he informed me that if the owner had a "dust collection system" on All of his machinery, that the wiring would be standard, but noted that every single piece of equipment would have to have it, no exceptions. Thanks for the replies... And yes, I'm trying to enter this very carefully. There has already been some wiring done [Linked Image] and I haven't really took a good look at it yet. I'm suppose to get a little deeper today.