Bonding contradictions for receptacles?

[2Broke2Sleep]

It's my understanding that receptacles installed to metal boxes inside a wall (sheetrock) have to be of the self-grounding design in order to not be required to run a bonding jumper to the ground screw on the receptacle (bonded via 6-32s). Also, if metal box is surface mounted, a receptacle not of the self-grounding type and using an industrial raised cover is considered bonded [after removing the insulated washer(s) ] and not required to have a jumper as I just described, BUT if the industrial cover is not raised then it is NOT considered bonded.

Now, if I install a switch to a metal box inside sheetrock as long as I use metal screws the switch is considered adequately bonded. 404.9 (B) (1). Is it just the simple fact this is not a receptacle?

314.25(A) Nonmetallic or Metal Covers and Plates - Where metal covers used, 250.110 applies - "Exposed, normally non-current carrying metal parts of fixed equipment supplied by or enclosing conductors or components that are likely to become energized shall be connected to an equipment grounding conductor....."

I've never seen a 1900 blank with a bonding jumper on it...... So again only the 8-32s are the required bonding method.


Maybe I'm splitting hairs here but is this a contradiction where a receptacle is not considered bonded by just using the 6-32 screws (no self-grounding design) but switches, blank plates, etc... are??

 

[infinity]

Maybe I'm splitting hairs here but is this a contradiction where a receptacle is not considered bonded by just using the 6-32 screws (no self-grounding design) but switches, blank plates, etc... are??

No contradiction, the receptacle will have things plugged into it the switch won't. So for the switch the two screws are good enough.

 

[2Broke2Sleep]

Touche

 

[tom baker]

For a raised cover a bonding jumper is not required if the cover has a crush corner design, but is for the older raised cover (which I don't think are still available)

 

[peter d]

I never bond switches in metal boxes. I consider it a waste of time, and besides, the NEC allows it.

 

[infinity]

It's my understanding that receptacles installed to metal boxes inside a wall (sheetrock) have to be of the self-grounding design in order to not be required to run a bonding jumper to the ground screw on the receptacle (bonded via 6-32s). Also, if metal box is surface mounted, a receptacle not of the self-grounding type and using an industrial raised cover is considered bonded [after removing the insulated washer(s) ] and not required to have a jumper as I just described, BUT if the industrial cover is not raised then it is NOT considered bonded.

Surface mounted boxes utilizing dimpled corner covers do not require a bonding jumper, those without the dimpled corners do require a bonding jumper. Not sure about the removing insulating washer part? That is usually for receptacles mounted directly to the box (as opposed to the cover) like a handy box or an FS box.