Mark each stud for notching using one of the nail guards as a template. Use a handsaw to cut the top and bottom lines for the notch to the depth of the plate thickness.
Thread the connector clockwise onto the twisted wires, being sure no bare copper is exposed at the bottom. Pull gently on the connector to be sure it’s secure. You can wrap electrical tape around the wires and cap for extra security or just push the splices into the back of the box and attach the cover plate.
In the center of each plate notch, cut a second, 3/4 inch notch for the cable. Make the depth about 1/2 inch to accept the cable thickness, but keep the entire notch depth to a maximum of 7/8 inch for load-bearing 2x4 studs and 1-7/16 inches for non load-bearing studs.
A current-carrying wire in an electrical circuit, also called the grounded circuit wire, it serves as the return path for current, and is connected to ground at the service panel. In household electrical circuits the neutral wire is colored white or gray. Some circuits make use of the white or gray wire as a hot wire, when this is done it will be marked with black tape or paint to identify it as hot.