One box is for low voltage (cable TV, HDMI, speaker wire) and the other box is for high voltage (electrical outlet).
An important thing to remember is to keep high and low voltage separated. Even with shielding, you risk having the high voltage cause interference with the low voltage.
An important note about doing electrical work in your house: I am a certified low voltage contractor. I am not NEC certified. Most local building codes require a certified electrician to do electrical work. Failure to do so could be a code violation and your home insurance company could find you liable if there were ever a fire. The purpose of this blog is neither to confirm nor deny that I do any of the electrical work. Even though I promote DiY in most cases, I recommend using a qualified electrician.
Ok, that's done. Next? The low voltage.
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