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I was trying to say - what is the point of NEC saying "likely to be energized" - when most AHJ's look at it as everything "can be energized" when someone is working on it. It is possible to open the supply on anything that gets worked on, even service gear - doesn't mean it always happens or is deemed practical. ...
( A) Working Space. Working space for equipment operating at 600 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized shall comply with the dimensions of 110.26(A)(1), (A)(2), and (A)(3) or as required or permitted elsewhere in this Code.
You are leaving out a key word in the rule. This really goes to my point as to the meaning of the word "required" as used in this section.
You can read it as it is never required as you can almost always find a way to do the work with the power off and if it means that, then almost no electrical equipment would need 110.26(A) work spaces.
Or you can read it as what the common field practices are, and in that case it would apply to all electrical equipment, because it is likely that all electrical equipment would be examined, adjusted, serviced or maintained while it is energized.
However given the code definition of "equipment" that brings up a lot more issues. The code required kitchen counter top receptacle is equipment and cannot have the required 110.26(A) work space.
This section really needs a lot of work. Maybe there were some public inputs for the 2017 cycle to address these issue, but I have not started looking at the public inputs yet.