Brain Tease: Grounding metal box

[jar546]

Is the screw for the plaster ring on a metal box allowed to be used to connect the equipment grounding conductor since it is machine threaded and engaged by at least 2 threads?

 

[chris kennedy]

250.148 © Metal Boxes. A connection shall be made between the one or more equipment grounding conductors and a metal box by means of a grounding screw that shall be used for no other purpose, equipment listed for grounding, or a listed grounding device.

..........

 

[jar546]

You are pretty quick at the draw there Chris. Thank you.

The hope is that people will read this and learn something new. I know I learn something new each day.

 

[TimNY]

FWIW, I find them to be a great learning experience. I even get one right now and then

 

[jar546]

Thanks for the feedback Tim. I get refreshed by having to look up stuff that I have not done in a while and others learn so it is a good thing all around.

 

[SCBO1]

jar,

I like mutil-choice brain tease questions? But I'm a visual learner as well, thanks for all you do for the board. This BUDS for you!

pc1

 

[Daddy-0-]

Brain Tease: Grounding metal boxIs the screw for the plaster ring on a metal box allowed to be used to connect the equipment grounding conductor since it is machine threaded and engaged by at least 2 threads?

Back at ya. Does it have to be green?

 

[raider1]

Back at ya. Does it have to be green?

Nope.

Chris