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Ceiling mounted fixtures are mounted directly to an electrical outlet box that is above the ceiling. This fixture can only be placed directly under the outlet box. This type of fixture has a base and a cover. The base mounts to the electrical box and contains the wiring and bulb socket(s). The cover is usually made of glass, and attaches to the base with three screws.
A chandelier has a chain and an outlet cover. The electrical cord passes through the chain. If the ceiling electrical box is not over the desired location of the chandelier, the chain can supported by a hook that is fastened to the ceiling. This hook is placed over the desired chandelier location. The cover is fastened to an electrical outlet box above the ceiling.
Replacing a ceiling mounted fixture is fairly simple, and can be done with screwdrivers (flat and/or phillips). Power needs to be turned off at the electrical panel. A shop light (might need extension cord) or headlamp will be needed. The new light fixture kit should contain mounting screws and wire connectors.
The instructions are reversed to mount the new fixture. The wire connectors that came with the new fixture should be used to connect the wires together from the electrical box to the fixture.