Last time I had to install new outlets in bedroom fed from existing bedroom circuit, I extended the existing circuit on an exterior wall to an exterior nema 3r 2 pole 4 space crouse hinds plastic load center, with the existing branch circuit lugged into the line side of said load center. I then installed an ark fault and fed my downstream loads off of that. Now I know that the load center feed is not sized as #8 or larger since it was from an existing branch circuit, but the ark fault is on my extension.
