Where is Ground Clamps [RE-wrenches]

[William Miller]

At 07:25 PM 4/25/2003 -0700, you wrote:
>    Or, the manufacturer could issue a technical service bulletin (like 
>the air plane mechanics get) recommending/ requiring using that hole for 
>attaching the ground lug with a  #12 x 3/4" self drilling Stainless 
>flange screw. I am assuming that the tiny little wood screw is used for 


Any self drilling screw I have used is classified as a sheet metal screw.
Sheet metal screws are expressly disallowed for grounding in the NEC.  I do
use self tapping machine screws, but these require pre-drilling.

William Miller

250.8 Connection of Grounding and Bonding Equipment.
Grounding conductors and bonding jumpers shall be connected by exothermic
welding, listed pressure connectors, listed clamps, or other listed means.
Connection devices or fittings that depend solely on solder shall not be
used. Sheet metal screws shall not be used to connect grounding conductors
to enclosures.

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William Miller
Miller Power and Communications
PO Box 50, Santa Margarita, CA 93453
Voice :805-438-5600     Fax: 805-438-4607	
email: wrmiller at slonet.org
http://millerpowerandcomm.com
License No. C-10-773985
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