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pman6 05-02-2013 05:54 AM

attaching ground wire in this box
 
2 Attachment(s)
Can a ground wire be attached to any screw in this box? like the big screw in the middle?

I'm wondering because new vanity lights have their own ground wires, and it doesn't look like there's anything to screw it to.

Jim Port 05-02-2013 05:56 AM

Screws used for ground wires shall not be used for any other purpose. You could drill and tap the box for a 10-32 machine screw. Unless that box is very old it is probably already tapped.

busman 05-02-2013 06:53 AM

That sure looks like a pancake box and I don't see a connector for the cable. It looks like all four 1/2 knockouts in the back of the box are intact and their should not be knockouts in the sides of a round box.

Mark

Jim Port 05-02-2013 07:00 AM

I thought it looked like a 4 square with a round plaster ring. Never seen a pancake without a straight edged side.

kbsparky 05-02-2013 07:02 AM

It looks like a 1900 box with a round plaster ring. Some of the rear knockouts are partially hidden, making me think this is not a pancake type box. There is additional room inside.

Drill and tap a threaded hole for a green screw is one way to attach a grounding pigtail for the fixture ground wires. I seem to recall this same photo in another thread about grounding ... <checking> ... ahh here it is.

busman 05-02-2013 07:09 AM

I've seen plenty of fully round pancake boxes. However, you are probably right that this is a 1900 box, but I've never seen one mounted to a bar hanger before.

Mark

mm11 05-02-2013 08:40 AM

Use a grounding clip instead. If the fixture grounding conductor is too small, take a piece of #14, install under the clip to make a ground tail, and splice to the fixture wire to the ground tail.

http://0101.nccdn.net/1_5/33d/308/1e...7863595939.jpg

Jim Port 05-02-2013 08:45 AM

The ground clip only works properly on a straight edge. The one shown is domed.

mm11 05-02-2013 09:51 AM

Quote:

Originally Posted by Jim Port (Post 1171156)
The ground clip only works properly on a straight edge. The one shown is domed.

What about installing the ground clip close to the tapped holes on the mudring?

Jim Port 05-02-2013 09:54 AM

I don't think there is enough flat area to get the proper contact area.

busman 05-02-2013 10:33 AM

If the box really has ground continuity, then drilling and tapping a 10/32 hole is the easy and correct way to go.

Mark

Seattle2k 05-02-2013 12:11 PM

Quote:

Originally Posted by busman (Post 1171207)
If the box really has ground continuity, then drilling and tapping a 10/32 hole is the easy and correct way to go.

Mark


yeah..is the box even itself grounded?

mm11 05-02-2013 12:13 PM

Quote:

Originally Posted by busman (Post 1171207)
If the box really has ground continuity, then drilling and tapping a 10/32 hole is the easy and correct way to go.

Mark

Tapping a hole is certainly the best method, but using a grounding clip is also correct. It meets the requirements of 250.8, when listed and installed per specs.

Looks to me like a grounding clip might work for the OP, but it's hard to say without actually trying myself. Just giving another option.

If it was me, I'd tap the box. Much better connection.

pman6 05-02-2013 05:26 PM

I attached another close up pic of inside the box.

it's not square, but it's deep and has side knock outs.

House was built in 1966, and all the boxes are metal, so I think they should be grounded.

Jim Port 05-02-2013 05:33 PM

A metal box does not mean it is grounded. The wiring method needs to have a ground before the box is grounded. Otherwise is is just floating.


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