Need help understanding code 250.110 (5)

[cadpoint]

I'd probably just use a grounding screw in the original box and a G-clip on the extension.

Well, this beg's an answer too, do you do this yourself routinely or this is what you'd do as an answer to the question/OP ?

 

[LarryFine]

Well, this beg's an answer too, do you do this yourself routinely or this is what you'd do as an answer to the question/OP ?

The latter.

 

[hurk27]

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.

The above in red is about the closest an inspector could possibly site, and that is if he was trying to call a extension box or mud ring a cover, but this is not what it is intended for.

Think garvin covers

I was hit with this one a few weeks ago.

 

[crossman gary]

Hurk, you didn't buy my post #8?

 

[hurk27]

Well It's not that I didn't buy it, but it kind of goes in circles, 250.8 is about how to make a grounding connection, but the extension box would not be considered as a connection, but as the EGC it self, wouldn't it? and because it is connected by machine screws it would be code compliant as of this section of 250.8 would allow it.
But as being the EGC it would seem that 250.118 should have included box's, box extension's, mud rings, pulling consults, cabinets, and quit a few other things that become a EGC when we pipe through them? where in 250.118 is a panel cabinet mention? or a meter socket?

So yes your post did cornfuse me a little, but I think we are on the same page.

And I think the CMP's expect a reasonable amount of common sense when a box is used as a EGC, and as long as it is attached by a method allowed in 250.8 it should be compliant

 

[crossman gary]

But as being the EGC it would seem that 250.118 should have included box's, box extension's, mud rings, pulling consults, cabinets, and quit a few other things that become a EGC when we pipe through them? where in 250.118 is a panel cabinet mention? or a meter socket?

Exactly!

So yes your post did cornfuse me a little, but I think we are on the same page.

Me too on both accounts...

And I think the CMP's expect a reasonable amount of common sense when a box is used as a EGC, and as long as it is attached by a method allowed in 250.8 it should be compliant

Yep, so I wonder what happened to the inspector in the original post?