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jmorc2003 01-21-2013 08:11 AM

Grounding question
 
1 Attachment(s)
Installing a new light fixture in my bathroom. Metal plate attaches to the receptacle in the wall, then a metal cover covers the plate (see pic). The copper wire is fastened by the manufacturer to the metal cover, and there is a green screw on the plate. Connecting the copper wire to the green screw will sufficiently ground it, right?

jbfan 01-21-2013 08:29 AM

As long as you have a ground wire coming from the box that also connects to the green screw.

jmorc2003 01-21-2013 09:59 AM

Quote:

Originally Posted by jbfan
As long as you have a ground wire coming from the box that also connects to the green screw.

I connected the black and white wires from the box to the plate. Ground wire from the plate to the cover. Only thing connecting it to the wall is the black and white wires

Jim Port 01-21-2013 11:40 AM

All the grounds should be spliced together. The ground from the wall can go under the screw. Leave a tail past the screw and wirenut the fixture ground to it.

jeffnc 01-21-2013 12:25 PM

Quote:

Originally Posted by jmorc2003 (Post 1098489)
Connecting the copper wire to the green screw will sufficiently ground it, right?

No!

Did you read the instructions that came with the fixture?

The ground wire from the wall cable must be attached to the green screw as well. Attach an 8" or so wire to the green screw and tighten it. Then take that wire, the wire that's connected to your light frame, and the ground wire from the wall and twist the 3 of them together with a wire nut.

jmorc2003 01-21-2013 02:24 PM

Sorry, one more clarification, the mounting plate for the light is also screwed into the receptacle in the wall. So it goes...
White and black wires coming out of wall are connected to white and black wire on mounting plate. Mounting plate is screwed into receptacle in wall.
Ground wire attached to metal cover is screwed into the green screw on the mounting plate. So it's all connected.

Assuming the box is grounded, and the plate is attached is to the box, and the cover is attached with the copper wire to the plate, aren't we all grounded?

jeffnc 01-21-2013 03:27 PM

Don't even know if your box is metal, let alone grounded.

Assuming the black and white wires coming from the box in the wall are in a cable with a ground wire, connect that ground wire to the green screw.

You might or might not be grounded, you are not supposed to count on the screws holding the bracket to the wall box to do the grounding.

jbfan 01-21-2013 04:39 PM

Black and white should never mount to the mounting plate.
Can you give another picture where the black and white would connect?

jmorc2003 01-22-2013 08:10 AM

Quote:

Originally Posted by jbfan
Black and white should never mount to the mounting plate.
Can you give another picture where the black and white would connect?

Only a black wire and white wire are coming out of the box in the wall. No ground wire coming out of the wall or box that I can see. Sorry, I'm at work so I can't get a pic until later, but the light came with a black wire and white wire (and the ground wire as described above) like all the lights I've ever seen. Connected the black to black and white to white, ground wire from the metal cover to the green screw on he mounting bracket and mounting bracket screwed into the box in the wall.
House was built in 1940. Could that make a difference? Also the box is more of a circular type, with a tab with a hole in it in on either side.

jeffnc 01-22-2013 02:54 PM

Quote:

Originally Posted by jmorc2003 (Post 1099306)
House was built in 1940. Could that make a difference?

Yes. Your wiring is probably ungrounded. If there is no ground, it seems to me that connecting the cover to the plate with the supplied ground wire could cause more harm than good. If there's a fault inside the electrical box or inside the light fixture, the last thing you want to do is connect it electrically to the cover.

Wait to hear from a licensed electrician who knows the code, but if you have no ground to connect to, I'd make sure that wire is not connected on the plate. It might end up being connected anyway due the hardware used to connect it.


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