Disclaimer: all of my advice will work and won't burn your house down. I live in the country outside Houston Texas and no one cares what I do out here. If you have a local nazi group that has different standards than normal people and they want conduit color coded to the architectural standards of the HOA I can't help you with that. I ain't fancy
Also for the other Nazis. Most places in the US do not require an electrician to do this, unless there is a local nazi code, which I know of none. Just because some people live in a bubble and have lived in the same general area doesn't mean anything about the rest of the 300 million other people is the same. The things which MUST have an inspection are anything that connects to the grid (new service, solar gird-tie, etc) Things that MIGHT require inspection are things like sub panel installations. (I get sub/panel installs inspected for the heck of it but never breaker installs) I own an electrical services company and there is a master electrician, never once has he told me hey don't do that, hey i'll come look at that, hey you need to pull a permit for that first, hey you need to have the inspector stop by your house when you run the new breaker for your charger/evse. If the certified master electrician and inspectors say I'm good to go on my own do you think I'm listening to them or a desk jockey in San Mateo?
Want to save some time/money? Run 40 amp breakers on a 14-50 plug and charge at 32amps you can run 8/3 romex for $2.44/ft and be done. No you want 50amp because you never know what you'll need this for? Great, keep reading.
Some things to consider as you'll need to make the decision on the wiring route.
WIRE
NOPE)
Romex/NM outdoor cable no conduit needed you'll need 6ga mains - I'm listing it but your retarded if you actually do it - don't do it. You're going to use conduit, I'm telling you now.
A)
NMB/Romex in conduit you'll need 6/3 which is three, 6ga mains and usually a 10ga ground. $2.85/ft
Southwire (By-the-Foot) 6/3 Stranded Romex SIMpull CU NM-B W/G Wire-63950099 - The Home Depot
B)
Individual THHN/THWN wires. You have to run 4 individual wires in conduit but you can run 8 gauge of THHN/THWN plus 10ga for ground instead of the 6ga with NM-B $1.92/ft for all 4 cables ($0.52*3)+$0.36
Cerrowire 50 ft. 8-Gauge Black Stranded THHN Wire-112-4001BR - The Home Depot
Home depot isn't pulling up some of the links online but I can always find it in store by the foot or packaged THHN-THWN rated in whatever color. Don't skip and get the bare copper ground get a coated one if going the THWN route. Running a 240v circuit you can run 2 blacks(hot)/white/ground but I always run Black(hot)/Red(hot)/White/Green This simply avoids future confusion when anyone goes in after you. My house came wired with a bunch of dual blacks on 240 and I hate it.
Also always run 4 wire 240v (3mains/ground) I call it 4 wire to avoid confusion with the occasional DIYer. Running that 3 stuff still flies some places but it's retarded in the long run, also you can do some cool stuff with it later.
Conduit How you have it drawn not happening
F'N A. so I typed all this stuff and realized it wont work the way you have it drawn. I was going to put the junction where you have it then run individual conduit to LB connectors but I don't now whats on the other side of the stuco to secure the LB connectors. Do You? If not and it's mostly hollow-ish I would run as follows.
You'll want to run PVC conduit because I like it.
From the breaker box a 1-1/2" lock nut to a 1-1/2" adapter:
This:
Halex 1-1/2 in. Rigid Sealer Conduit Locknuts (2-Pack)-96185 - The Home Depot
Connects to This :
Carlon 1-1/2 in. Non-Metallic Terminal Adapter-E943HR-CTN - The Home Depot
Then run 1.5" conduit with the individual cables for each circuit all the way to the backside of the garage wall THEN put the junction box.
Connect conduit to box via this and use liberal amounts of sealant(after the pvc cement).
1-1/2 in. Box Adapter-R5133719 - The Home Depot
Then drill another hole going out and do the same thing for the individual lines so you'll have a 1.5" hole in the side of the box with wire coming in and a single 1.5" hole in the back with the wires going through the wall. use the same box adapter so it physically goes into the stuco/wall
Then, assuming the structure is hollow-ish like a normal wall, drill two holes on the front side of the garage and fish through the individual circuits. Wire up the circuits however you planed on. 1 hole in back for the junction, 2 holes up front for the chargers.
Conclusion
Pretty simple when you think about it. Use two 50A breakers, simple knockout from the breaker box with locknut/conduit adapter, run conduit to junction box, run wire from breaker to junction, drill hole in back of box and wall, drill 2 holes on front of wall, run wire through holes, wire receptacles , wire up breakers, test, turn breakers off, mount boxes and seal everything up, turn breakers back on and test circuits again.
Parts list
2X 50A breakers
1 X lock nut
1X terminal adapter
??? X 1.5" conduit and elbows
??? X conduit straps
1X Junction box
2X 1.5" box adapter, you can use lock nut and terminal adapters if you want
PVC cement for box adapters
14-50 plugs
What ever wire you choose 6/3 Romex/NM-B is easier, THWN is cheaper.
How I'd do it in yellow
