Another Grounding Question

[telecaster]

When grounding to the electrical box,would it be up to code to take a self tapping screw to attach the ground wire to it instead of using a corner clamp or meter clamp?

Thanks

 

[Mike500]

Grounding to a sheet metal screw is strictly prohibited. The screw must be threaded and placed into a tapped hole.

 

[telecaster]

Grounding to a sheet metal screw is strictly prohibited. The screw must be threaded and placed into a tapped hole.

So self tapping screws are not threaded?
Sorry ,dont follow you.

Thanks

 

[SatinKzo]

Is this what you are talking about?

http://www.kramerfirm.com/pictures/displayimage.php?album=8&pos=46

Is so, it is not proper.

BTW, view the rest of that link for all the other examples of bad grounding.
http://www.kramerfirm.com/pictures/thumbnails.php?album=8
(Web link per another sat guy thread)

 

[Mike500]

So self tapping screws are not threaded?
Sorry ,dont follow you.

Thanks

Threaded means tapped or cut threads with a machine screw tap or a lathe cutting tool. A self tapping screw like a sheet metal screw with tapered threads designed to force or make threads by displacement does not comply. The threads must be cut uniform down the entire length of the cylindrical recess of the hole.

Some screws that cut threads comply, but not the standard sheet metal screw.