Jaf2290
....yes. i suspect that will do. the steps are easy enough... I just did it on three of the four dedicated outlets I was using... if I can do it I'm certain anyone else can too. I found no boxes behind the outlets when I upgraded to the hospital grade outlets I installed. consequently, I installed single gang boxes as well as replacing the old outlets. opening up the one you wish to update, removing the outlet, and box go get whatever you wish to add in terms of another 'box' and yes, make a joint of the incoming dedicated line and pigtail off of it to the new outlets using wire nuts and more romex or THHN - your choice. No sense in going overboard with anything fancy right there. the runs too short. Add the second outlet and a new face plate with two outlets in it... and bang! Done deal. Again, personally, adding a second singular line is not a bad notion... though I'd add it only for the opportunity to provide for a greater current drawing device (s). Hope that helps.