[daltonas]

Is it to code to have a 220 line and 110 line in the same outlet box?

For example, a 110 outlet having 110 line coming in, and a 220 line coming in and a 220 going out.
From the outside, there is only 110 plugs,
But on the inside, I would like to run new wire and use it as a junction box for the 12/2 220V line, coming from the panel.
I can upgrade these boxes to 2G if needed.

Basically, I have a 110 outlet and a 220 outlet I want to swap.
The 110 outlet has a line in, and a line out (its in the middle of the string)
The 220 outlet is home run to the panel, the only outlet on the line.
I would like to add a 12/2 line from the 220 to the 110 box,
And a 14/2 line from the 110 box to the 220 box.
The old 110 box will have 1 14/2 coming in, tied to 2 14/2 going out, and 1 12/2 220V coming in.
The old 220 box will have 12/2 coming in, 12/2 going out, and 1 14/2 110V coming in.

Thanks,