A two wire cable run from a light fixture to a switch on a wall. Its only function is to control the on and off state of the light. Underground Feed cable used to run electricity underground. The sheathing on this cable is thicker and more durable than the NM cable used for interior applications.
First, plan the path for the new wiring and remove the baseboards where necessary. Use a sharp drywall knife to cut the caulk and paint sealing the top of the baseboard to the wall.
Mark and cut a hole about 4 inches wide in the wall to expose the top plate and a few inches of the wall cavity. Also cut a few inches into the ceiling to allow for reaching in to grab the fish tape.
This method will not work with thinner wall material such as ½inch drywall, at least ¾inch of wall material is needed to bury the metal sheath. For walls less than ¾inch, the studs behind the baseboard can be notched to run a new NM cable and a metal plate used at each stud to protect the wires from punctures.