receptacle grounding

[georgem]

Does current NEC code require that the ground wire (nonmetallic cable) of a duplex receptacle or light switch be pigtailed to the metal box or is the connection through the yoke of the recepatcle sufficient?

 

[don_resqcapt19]

Re: receptacle grounding

george,
250.148 requires that the EGC be connected to the box. 404.9(B) permits the switch grounding screws to ground the switch and its cover. 250.146(B) permits "self-grounding" receptacles to be used without a direct EGC connection to the receptacle. If you are not using this type of receptacle the EGC must be connected to the receptacle.
Don

 

[georgem]

Re: receptacle grounding

Is an ordinary receptacle "self-gorunding"? New recepatcles have one steel screw in the yoke with a brass fitting on the yoke that makes for better contact with the metal box.

 

[goldstar]

Re: receptacle grounding

George,

The receptacles with the brass clip on one end are the "self grounding" type and don't require the EGC to be connected to the green screw. The EGC must be secured under the green screw of the receptacles without the clip. In either case the EGC must be bonded to the metal box.

 

[georgem]

Re: receptacle grounding

If the EGC is connected to the green screw of a "self-grounding" receptacle, is the bonding through the brass clip and steel screw of the yoke to the metal box sufficient to constitute bonding to the metal box?

 

[iwire]

Re: receptacle grounding

Originally posted by georgem:
If the EGC is connected to the green screw of a "self-grounding" receptacle, is the bonding through the brass clip and steel screw of the yoke to the metal box sufficient to constitute bonding to the metal box?

I would say no,

250.148 Continuity and Attachment of Equipment Grounding Conductors to Boxes.

The arrangement of grounding connections shall be such that the disconnection or the removal of a receptacle, luminaire (fixture), or other device fed from the box will not interfere with or interrupt the grounding continuity.

 

[james wuebker]

Re: receptacle grounding

If I remember correct \, if the metal box is a flush mount type the box doesn't have to be grounded only the recep.
Bye now

 

[iwire]

Re: receptacle grounding

Hi James, I think you might be mixing up the intent of 250.146(A) unless you know an article I am missing.

2002 NEC

250.146(A)Surface Mounted Box.
Where the box is mounted on the surface, direct metal-to-metal contact between the device yoke and the box shall be permitted to ground the receptacle to the box. This provision shall not apply to cover-mounted receptacles unless the box and cover combination are listed as providing satisfactory ground continuity between the box and the receptacle.

I do not know of any article that lets a device ground the box it is mounted to.

 

[pierre]

Re: receptacle grounding

James

Sometimes reading too fast or reading the section just once causes us to read or interpret the part we are reading incorrectly. In your case, flush is the key word, 240.146(A) uses the word 'SURFACE' mounted. In the handbook, they have a good picture to show this. As iwire has said, not using a flush box, such as a 'cutin jembox'(device box), for your bonding connection, even though it seems as if the metal of the yoke is exposed enough.

Pierre

 

[james wuebker]

Re: receptacle grounding

You guys are correct. I didn't read that art. before I posted this answer. I have most of the code in my mind but sometime it slips by me. I maybe should catch up on my reading again. Thanks for reminding my about my post.
Bye now
Jim