It's in the working space requirement section, which applies to "equipment likely to require examination, adjustment, servicing, or maintenance while energized".
Much as I'd like to see the requirements relaxed to make some jobs easier, as someone who has to do all those things with inverters I can't really support the notion that I will do all of them with the equipment de-energized. For example, what if a Solaredge has gone kaput and I need to test whether it's getting AC voltage in order to determine if it's the inverter or the AC connection? I will be examining it while energized, and I have to, and I won't even know for sure if it's energized until I examine it.