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You say yu can't access the rear of your main panel to bring the new cables into it. I guess I don't understand this fully. Where is your main panel located? Is the panel installed inside a wall stud cavity and just the panel door showing? And why would you run the cables outside? And, just one last question, how do you plan on accessing the main panel to install conduit into it for these new circuit wires?
All these questions are needed just to get an idea and maybe offer some alternatives to your plan. It's not really a good idea to have these connections in a j-box outside if you can help it.
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