Huh…I wonder why it wasn’t required here. I believe were on the 2018 code if I’m not mistaken. shrug
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Thanks everyone for the input. I appreciate the learning experience.
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So many wrong things here, where to start? How about this one… Green wires are not allowed to be used as current carrying conductors.
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Yeah, there are hella issues wrong with this box. I can say with decent confidence that a licensed electrician did not install this box. Haha
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A GES (grounding electrode system) is required when a separate structure is supplied by a feeder. In this case with the panel in the separate structure the supply would be a feeder and a GES would be required. Since the supply is a single branch circuit if the panel were eliminated then the GES would not be required. You would still need a disconnecting means for the separate structure.
As others have mentioned this entire panel needs to be redone starting with the feeder.
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Does that need to be something other than a breaker in the main building?
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A separate structure would require the disconnecting means to be at the separate structure. For a single 20 amp circuit it can be a toggle switch. If you scroll up a few posts Ryan has the NEC section {225.32}
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It is a little confusing in that Ryan’s reference to NEC section {225.32} was not required for me in our jurisdiction a few years ago.
That is strange because that has been in the NEC for decades.
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I believe I’m coming to the conclusion that the electrical inspector was less than adequate on that job, because, now that I think more about that code section, it was required at my new abode when I added another detached garage (same deal same county) 
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[quote=“Larry Kage, CMI, post:17, topic:233312, username:lkage”]
Does that hold true everywhere if one runs a single 20 amp 120 volt circuit to said detached garage?
[/quote] It looks that that detached garage had at least three active circuits. If you only had one circuit it’s likely to only be able to run the lights, a few outlets and maybe a garage door opener for an average size garage.
I am curious about that photo 
, the bottom text
“Prior to 2008 a 3 wire feeder ok…”
I recall an older thread where I had a master electrician wrote that same line “The code to separate the grounds and neutrals first appeared in the code (loosely) in 1999. It was shored up to what it is today around 2008.” and @rmeier2 responded that it is totally false. (this just leads to my forever confusion about when a bond is and is not allowed)
<I hope I did all the hyperlinks and what nots ok, this forum sometimes confuses me how to do all that fancy stuff folks do>
That older thread was about a sub-panel within the same structure. This thread is about a detached structure which prior to the 2008 had a different rule regarding bonding the grounded conductor at the sub-panel.
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Key words being “each structure containing more than one branch circuit”…(my example had one.)
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