How to change 2 prong outlet into 3 prong?
Posted January 15 2008 - 02:57 AM
IIRC there were 2 black wires and 2 white wires. I think only 1 of each was hooked to the screws. The copper wire is screwed to the side I think. They lead to a metal hole at the top with some paper wrapped around them. The box is plastic.
What's a good and easy way to get a grounded 3 prong outlet? This will only be used for a computer and I read that GFI is not good with it. Also 15 or 20 amp receptacle? Thanks in advance.
Posted January 15 2008 - 10:10 AM
Posted January 15 2008 - 06:22 PM
Posted January 15 2008 - 08:22 PM
You said there are 2 white and 2 black wires so there must be 2 cables coming to the box. Can you see if each of the cables has a copper ground wire?
If only 2 of the wires are connected to the outlet are they pigtailed from a wire nut or are 2 capped and not being used?
If you can post exactly what you have I'm sure someone can help.
Posted January 15 2008 - 09:32 PM
Posted January 15 2008 - 09:46 PM
Posted January 15 2008 - 11:03 PM
when i plug the red and black one into both outlets the light goes on. i never tried to plug it into the outlet with the 3 prong adapter plugged in.
when i plugged the 3 prong tester into the adapter (3rd hole at top, metal tab at the top screwed in, short slit on left), the tester is backwards i assume (sticker with descriptions is not visible) the first 2 lights are on. which either means hot/neutral reverse if it's backwards or grounded if not backwards.
when the adapter was plugged in with 3rd hole at bottom, metal tab at top screwed in, large slit on left, the stickers with descriptions is visible and showed hot/neutral reverse.
whenever the adapter wasn't screwed in either way i plugged it, it said open ground.
i also looked at the wiring/receptacle again. there are 4 screws (2 on left, 2 on right) and 4 wires (2 black hooked to screws on left, 2 white hooked to screws on the right). i hope that helps with solving this. any other details needed, just ask.
Posted January 16 2008 - 12:30 AM
Posted January 16 2008 - 02:58 PM
From the sound of it, your box is already grounded, that's what the tab screwed in to the box is for. If you don't connect the tab you don't get the ground.
So if I understood your post, the left side of your socket is hot and should get the thin blade of the adapter, and you need to connect the tab to the screw in the face plate to complete the ground. Your three prong tester should show two orange lights.
Posted January 16 2008 - 03:15 PM
There are 2 sets of wires coming into the box. Each set would be a black wire and a white wire. This will give you what you have described, 2 black & 2 white wires. Is there also a pair of bare copper wires tucked in the box? If there is you are all set. You might need to get a 8inch piece of bare copper wire to extend your ground wire to your receptacle. Both bare wires will need to stay twisted together, no matter what else you do. The extra piece of bare copper wire will have one end twisted to these bare wires. Make all twists clockwise to tighten.
Turn off the circuit breaker to these wires. Now look at the colors of the screws on your receptacle. You will see 1 green screw, this is for the bare copper ground wire. Wrap the wire clockwise around the screw. Now look for the 2 silver colored screws, these will be on the side with the longer slots, these are the neutral wires. Wrap each white wire clockwise each silver screw. Now you will have 2 brass/copper colored screws remaining, these are the hot wires.. Wrap each black wire clockwise around each screw.
The reason for the clockwise wrap, is the wire will tighten when you tighten the screw. Wrapped CCW the wire can come out from under the screw.
Also there is no correct way to install the receptacle. Ground hole up, or down it doesn't matter. Your tester is made for the ground hole to be down with the large slots to the left.
Posted January 16 2008 - 06:38 PM
Posted January 16 2008 - 07:01 PM
If your wires are in metal sheathed cable, you need to change to a metal box with a clamp in it for the armored cable. The plug will be grounded when you screw the recpt to the box.
Posted January 17 2008 - 09:57 AM
Originally Posted by longcaster
Also there is no correct way to install the receptacle. Ground hole up, or down it doesn't matter.
I believe current code is ground hole up.
Posted January 17 2008 - 01:53 PM
Posted January 17 2008 - 02:45 PM