If no access is available from above you can work through the outlet hole to install a specially made, adjustable fan support. Using this method it can be difficult to secure the support and set the outlet box at the proper, finished level. An easier way to be sure of proper placement is to use the method here to install a wood frame. The ceiling must be cut to do this, after which the damage can be patched and/or covered with a decorative medallion.
Decide on the location for the new electrical fixture and where the source will be. Determine inside of which walls and ceilings the cable must be run. For example, with a new ceiling fixture using a source from an existing wall receptacle, the cable will have to be run inside the wall cavity, through the top plate, into the ceiling cavity, and on to the new fixture.
Use a straight edge held flat against the top of the base cap to keep your line straight as you pull the knife through the caulk several times until it’s cut cleanly.
A circuit breaker or fuse box. Electricity enters the household circuitry through the service panel and is distributed from there through circuit breakers or fuses to branch circuits.