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"If you know what you're looking at, you'll be "shocked"."
Oh my...Looks like a 3 phase fused disconnect but that middle fuse will handle a lot of current! I was looking at a dual 7.5 ton condensing unit one time. I turned the disconnect off and started taking the panel off to get to the control circuit to check out a couple of things. Just about the time I got the panel off the unit started up. The disconnect was as 60 amp and should have been a 100 amp for the size unit and apparently had burned up at some point. Rather than replace it some brighto had just bypassed it. That one scared me and afterward got my blood pressure up...