Air conditioning off meter?

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I was called out to take care of an update required before selling a house. I used to be a duplex so it had a double meter socket, easy enough upgrade, but the air conditioner was fed from the bottom of the meter socket, I'm assuming because the panel didn't have any existing spaces and the QO tandem breakers are more expensive than the $25 Eaton disconnect they used. The inspector said nothing about the way the AC was run in the paperwork just to update the meter socket and install proper grounding. Is it assumed that I will update the way the AC is fed when I put the new meter socket in? Just trying to bid the job properly, with parts labor and permits I am at $600, that's before the AC feed fix.
 
You were asked to replace a duplex meter because only one of the meter positions was in use? Seen hundreds of these kinds of situations, they make blank devices to cover them if there is no meter installed.

The AC unit - is your AC disconnect service rated? Does it have a grounding electrode conductor connected to it? Is it in same vicinity as other service disonnecting means? How it is connected could be a problem - the quick and easy method is to usually put conductors in same lug as other conductor(s) and the lug is only listed for one conductor.
 
Where is the main panel disconnect in relation to the AC disconnect? All of the disconnects for a service must be grouped.
 
The 100amp QO load center is right next to the 60 Ac disconnect. Both are in the basement and are fed from the bottom of exterior meter socket that has to be replaced. Can I run both the from the new 100A meter socket and be in compliance?
 
Pictures of the service equipment

Pictures of the service equipment

Here are a few pictures.
 

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Existing equipment

Existing equipment

This is as it sits now, feed to the left on bottom is to the top of the load center, middle is to the AC disconnect and right is self explanatory.
 

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Almost certainly there shouldn't be two wires on the lugs like that. Use 3-position Polaris blocks, or similar, to properly splice multiple sets of service entrance conductors. Maybe do it in a separate j-box for proper wiring space. Other than fixing that part of the workmanship there is nothing wrong with the setup.
 
The 60 amp disconnect appears to not have overcurrent protection, also probably isn't rated for use as service equipment.
 
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