How do you extend romex wire you moved an outlet you need to extend and connect?

Answer 1

You need to splice the extension Romex, using wire nuts, inside a covered junction box made for the purpose. If you can do it within the original outlet box you can put a blank cover on the box. If not you may have to install a new "old work" box in wall. If you can get to wire in attic or basement you could put the junction box in one of those locations. The junction box must be accessible so you can't bury it in the wall.

Answer 2

To extend a Romex wire that you moved an outlet, you can cut the existing wire at the original outlet location and add a new piece of Romex wire to reach the new outlet location. Use wire nuts to connect the old wire to the new wire, making sure to match the colors (black to black, white to white, and bare copper to bare copper). Finally, secure the connections with electrical tape and install the outlet at the new location.