I just did a little work to a couple churches. 2 different cases but in one the counter tops were wired in home fashion, this had a serving countertop with serving window. Due to the layout it left 1 120V circuit to do most of the work and they constantly tripping and to top it off on the other part of the wall were additional outlets on same one where they put coffee. They had cords running from all parts of the building and to a cook station for 10 roasters they have. real mess.
The installer should have added 2 more circuits and it would have worked for the most part. So, I gave them GJ super overkill. Since all the new were away from water and didn't need gfci I bought a roll of 3 conductor, pulled 3 new cables to the counters and 1 to coffee. Disconnected the feed thry from GFCI on old circuit and made it in to a dedicated 120 abandoned all the old wire, It was a little overkill but the nature of the install made it just as easy to use a lot of spaces and the extra material was not a factor. I used most of the old holes and were there was a daisey chain I ran a new cable. Put multiwires to duplexes and made it so they simply cant overload something , limited recepts to own circuit for most of it, new multi wire to coffee station, was part of a shared and now 2 circuits.
Point of it all was I use double pole breakers in it, I kept 1 power to a box, all the recepts in it were split and on same yoke, doesn't matter if they did common trip which they never will with 8 new to do what 1 was trying to do. It was run by old women and maintenance man and they really didn't know how the building was wired and they trial and error a lot to make it usable.
They had shared stuff in another room for cookers, was great the guy had quads but didn't do any good as no one understood the wire and they overload it with cookers. I add another quad with 4 circuit sand reduce the originals to a circuit to a duplex and shove a child proof in half of it, there was another there they were not sure of , put every outlet on its own. They were loading all this or trying to with 1500 watt food trays. You could use one and a small household crock but when they plug 2 of those in it was lights out.
They completely eliminate overload trips. Basically limited every outlet to 15A, let them cook in the kitchen if they want right on the counter tops, they bout burned the place down a couple times makeshifting it.
The other church the maint guys were having a little issue with breaker and wire sizes. The box was really packed and some 12 was on 15 and 1 12 on a 30. Over its history had 5 guys work on it. I could spot them, they left signatures. The last guy isn't looking to do any more work than he had to, he had one minor mistake in a multi wire but it was fixed lights and never an issue but I told the main guy, the last one is a brilliant electrician with licence and wasn't going to leave the overcurrent wrong.
He was not a perfectionist but also not going to leave any glaring fundamental principles violated.
He also has a limited amount of stock and to uncongest the box some ran 12/3 out of it to some lights used as Jbox in utility where they branch to old wire,,, which was 14 and the 30 went direct to a hidden sump pump outlet. Didn't have any multi on same yokes and they were wired randomly around the panel. Only turns off half the circuit to the first Jbox.
It had a bunch of tandems in it.
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