I’m posting this question to determine if there is a safe manner to do this that meets code and isn’t a redneck solution.
The sub panel in my garage is run off a 50 amp breaker that is in my service box/panel outside. The wire appears to be 4 awg (possibly 3, but at least 4) aluminum wire. I couldn’t seem to find any labeling on the wire or sheathing, so that has been annoying. It seems I could maybe upgrade this to at least 55A if it is 4 awg aluminum, but that’s another question. The sub panel wire runs through roof just above the ceiling.
I need to add a 50A/240V circuit on the other side of the garage from the sub panel. One option is to run it from the existing sub panel, and I can do that but something to note is that the sub panel wire runs directly above where I need to put this 50A outlet.
So, I’m wondering if there is an approved way to splice the sub panel wire in a junction box above the ceiling, and then I’d only have to buy wire to go directly down the wall from there (or in conduit, if need be). This would save me all kinds of snaking and about 25ft of 6awg copper.
If the answer is yes, do I have to run it to a sub panel first, or can I run it directly to something like this: https://www.walmart.com/ip/Parallax-PGU055C-60A-120-240V-Outdoor-RV-Power-Outlet-with-20A-1-50A-2-Pole-Breaker-14-50R-5-20R2-GFl-Receptacle/100815504
I guess that kind of negates the cost savings on wire, but it might be easier still.
As I write this I feel like I’m maybe asking how to cobble something, and I’d really rather not cobble electrical work :).