Grounding screw requirement [RE-wrenches]

[Joe Felker]

Look in the 2008 code.  That's what I quoted from...

Aaron Wellendorf wrote:
> 
> Joe,
> 
> The 2005 NEC 250.8 does not mention thread engagement standards, machine
> screws, or thread-forming screws. It requires use of a "listed means" of
> connection, no solder only connections, and forbids sheet metal screws.
> "Sheet metal screws shall not be used to connect grounding conductors or
> connection devices to enclosures."
> 
> The "listed means" of connection most likely incorporates thread
> engagement standards in the listing testing process, but they are not
> spelled out. Probably because if you install the component in the listed
> manner you would meet the unstated standard. I would still like to know
> where an electrical thread engagement standard is found. I want to
> incorporate the standard into our training program. The NRTL's test to
> written standards and approve grounding connections and grounding kits
> (like Sq D's). Like Brian Wiley said, the standard may be mechanical and
> does not appear to be in the NEC.
> 
> Thank you for pointing out the non-sheet metal screw requirement. 
> 
> Aaron Wellendorf
> 
> Joe Felker wrote:
> <Look in 250.8 Connection of Grounding & Bonding Equipment
> <It permits the use of machine screws or thread-forming screws that 
> <engage not less than two threads
> 
> 



Joe Felker

Engineering Manager
NABCEP Certified Solar PV Installer
The Solar Center


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