Where is Ground [RE-wrenches]

[Daryl Thayer]

HI 
I think the code requirement is 1.5 threads in the
material.  A 24 tpi would be fine for all the frames I
am familiar with.  The 24 thread if at least 1.5
threads are in the material is stronger than the 32
tpi due to greater thread depth.  It may be the cost
is so high because you are ordering so few.  It may be
you have a $3000 to $4000 set-up charge.  

By the way, standard ground screw is a 10-32.

Thanks Daryl

--- "Dean T. Newberry" <deant at dcn.org> wrote:
> Hi Richard, I didn't reasearch it at all, just
> shooting from the hip to 
> get a cost. Initial conversation is that they will
> be about $5000 for 
> 50,000 screws, I guess that is about ten cents
> apiece, I'll call my rep 
> tomorrow and ask her to change the spec to 32 tpi.
> Thanks for the heads up.
> I am working on a plan for some Unistrut type
> racking with tooling on 
> the top to "bite" into the module frame and provide
> grounding through 
> the rack. I think Tile trak has that feature. I'll
> be testing over the 
> summer and will keep you posted.
> cul  deant
> 
> Richard L Ratico wrote:
> 
> >Hi Dean,
> >
> >Is there a particular reason you chose a 24 thread
> per inch screw rather than
> >32? Standard green grounding screws are 32 tpi, as
> are electrical device screws 
> >(receptacles, switches), and box screws.
> >
> >I wonder if the finer 32 thread offers a superior
> mechanical and electrical
> >bond, particularly in thin metals like module
> frames.
> >
> >Thanks for taking the initiative here.
> >
> >Best.
> >Dick Ratico
> >Solarwind Electric
> >P.O. Box 402
> >Bradford, VT 05033
> >802-222-9028
> >
> >Dean T. Newberry wrote:
> >
> >Hi yAll,
> >I have requested Rainbow Fasteners to request a
> screw manufacturer to 
> >fabricate a standard pattern, 12-24 flange head
> self drilling screw in 
> >404 stainless for our use. I have placed an initial
> order for 50k units, 
> >I expect to hear back the first week of june the
> willingness of the 
> >manufacturer to produce the order. The noncompliant
> screw, 12-16 flange 
> >head self driller I am using now costs $5.15/lb I
> expect the 12-24 
> >pattern to be a similar price.
> >cul  deant at dcn.org
> > 
> >
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