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Re: [TCML] Source for copper hardware



Dave

Use silicon bronze hardware, check at any local fastener supplier.  That's
all we use on copper bus bars in switchgear.  Also use lock washers and
flat-washers.  Your rms currents are significantly higher then a SG TC.
If rms currents are approaching 100% DC, standard industry convention
is 1 sq in cross section copper / 1kA (NEMA, UL, IEEE standards).
FWIW

Regards
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA

On Tue, Mar 30, 2010 at 2:30 PM, Dave Leddon <dave@xxxxxxxxxx> wrote:
> I've been trying to eliminate hot spots in the primary circuit of a
> relatively high current (~3000 amp) drsstc by replacing high resistance
> connection points with copper.  Even a one-inch length of 3/8-inch brass
> bolt can generate enough heat to melt the solder right out of a terminal
> lug.  Which raise another interesting point, what about solder?  It has ten
> times the resistance of copper so maybe all lugs should be crimped.  I only
> soldered them because I don't own a crimper large enough to deal with #2
> welding cable.  But I digress.  I've not had any success locating a source
> for copper nuts and bolts, probably because copper isn't strong enough to be
> consider a fastener, and so have been force to machine my own.  I would much
> rather just plunk down the credit card.  Does anybody know of a good source
> for copper hardware?
>
> Dave
> Pleasanton, ca
>
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-- 
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA

Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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