In contrast to new work boxes which are screwed to the wall studs before drywall is hung old work boxes hang on the drywall with clamps built in to the box.
Install ceiling light without outlet box.
Place the back of the box on the wall or ceiling and adjust it straight and level.
Cut along the trace line with a drywall saw and remove the cutout.
The procedure for installing a remodel junction box calls for a pencil drywall saw and screwdriver.
Light fixtures that simply protrude from the ceiling or wall without a junction box are a fire waiting to happen.
Installing a ceiling fan chandelier or other heavy light fixture in an existing ceiling requires the right junction box j box.
If your light fixture weighs more than 50 lbs it has to be supported independent of the electrical box.
Or other heavy light fixture in an existing ceiling requires.
For example if you have a light fixture that doesn t need a box for mounting but the wiring connections are not protected by some kind of cover then you can t use the fixture without a junction box.
The national electric code requires that all fans 35 pounds and over must be supported with an outlet box or outlet box system that is listed for ceiling fan support.
In some cases a ceiling outlet is installed to plug in the cord for a hanging light.
The cost to install a ceiling light fan switch isn t much and can save you a lot of work in the future.
Getting the wiring ready mark and cut the holes for the electrical boxes but don t install the boxes until the wires are run.
The box must be mounted firmly either by attaching it directly to a framing member or by using a fan rated brace.
Or if a fixture meets all of the criteria of a box but lacks a cable clamp don t use it without a box.
For example you would install a remodeling box if you need an additional outlet for a home office or theater.
If you have an old light fixture that is not attached to the wall or ceiling with a junction box you should repair the light fixture by removing it installing a junction box and installing a new fixture.
Trace the outline of the back of the box on the drywall using a pencil.
Standard electrical boxes used for wall outlets are installed for ceiling outlets in garages sheds and workshops.