Originally Posted by Derek Day
How difficult of a project is it to convert a light socket to a 3pin plugin socket?
You won't know until you remove the fixture. There are screw in adapters to convert to 2-prong, but not 3-prong, at least that I have seen, because there is no way to get to the ground.
If there is an equipment grounding conductor, it is pretty straight forward. Electrically, it is just a matter of connecting the three wires appropriately. Mechanically, it is something else. The fixture is probably mounted to a 3" or 4" round or octagonal box. If it is deep enought, it may be possible to mount a single or duplex receptacle it it. But you may be limited to a metal plate. There might be plastic plates available, but I don't know where. It is possible you may have to replace the box. There will be some repair to ceiling. Worst case would be a pancake box attached to a ceiling joist. You will have to move the box to one side or the other of the joist to get enough depth. Installing the new box itself is simple, use an appropriate old work box.
If there is no equipment grounding conductor, you will either have to rewire or install a GFCI receptacle to be able to use 3-prong plugs. With the GFCI receptacle, you still won't have a ground, but it will be safe. Don't know how the projector will like it, though.Edited by Colm - 8/14/13 at 6:11pm