I see that for Legally Required Standby Systems, 701.25 Accessibility states that the branch circuit overcurrent devices shall be accessible to authorized persons only, but I don’t see anything at all mentioned in 702 for Optional Standby Systems, which is what a setup like this would normally be. So not sure, but maybe it is up to the manufacturer if they want the HO to be able to access them or not. I may have to flip through the UL white book later on and see if anything pops up.
