Grasp the top and bottom brackets and pull the device straight out from the outlet box so you can reach the sides and back. If you will be disposing of the old device, completely remove the terminal screws. This will make it much easier to free the hooked ends of the wires.
A safety wire included in a household electrical circuit to carry current directly to ground in case of a short. The grounding wire in household electrical cable is usually bare copper, but it may also be found covered with green plastic insulation.
The uninterrupted path of electricity. A wire from one end to another has continuity, install a switch between the two end and turn it off to break the path and interrupt the continuity.
Also called an old-work box, these are electrical boxes with built-in clamps to fasten them into finished walls. All that is needed to install one is to cut a hole the proper size in the hollow part of a wall and insert the box. These can be used in drywall, plaster or paneling. They are best suited for adding wall receptacles and switches. Because they don’t offer much support, old work boxes are not a good choice for installing a new ceiling fixture.