After choosing the electrical source, decide where to cut the walls and ceilings to run the new cable. For example, to run from an existing wall receptacle up to a new ceiling light fixture, a small hole should be cut in the corner where the wall and ceiling meet. The top plate is then notched to pass the cable and afterwards a metal plate is attached over the notch to protect the wires.
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.
If there are several ground wires, tie them all together with a short pieces of wire to connect to the terminal screws. There is no hole in the receptacle or switch for the ground wire, only a screw.
Scrape the old caulk off the wall and molding using a putty knife, and remove the old nails. Sand the wood lightly with 120 sandpaper and put it aside to reinstall later.