600 VDC switches [RE-wrenches]

[Brad Bassett]

Bill, the Isc is 5.46A, so 5.46 x 2 x 1.25 = 13.65A

4.77A is the Imp. I think designing to Imp might be more realistic 
though. Or take the PV 1.25 off the Isc. I've never seen Isc x 1.25 
continuously (3 hours).

Brad



Bill Brooks wrote:
> Brad,
> 
> I'm not sure that this question got answered. John Berdner probably 
> knows
> better than I, but my understanding is that 13A is a continuous rating. 
> The
> issue with a disconnect is what happens when it opens anyway, so it is a 
> bit
> different than wire. However--the proper way to size is based on 690.8 
> which
> says you take the total Isc of parallel strings and multiply by 1.25. 
> The
> Isc of the 165-Watt module is 4.77 amps so max current is 12 amps (4.77A 
> x 2
> x 1.25 = 11.925).
> 
> Some bright guy must have picked that 13 amp number.
> 
> Bill.
> 
> 
> -----Original Message-----
> From: Brad Bassett [mailto:bsbassett at earthlink.net]
> Sent: Wednesday, February 12, 2003 9:18 AM
> To: RE-wrenches at topica.com
> Subject: SPAM: RE: 600 VDC switches [RE-wrenches]
> 
> 
> John,
> 
> I have not seen an answer to this question. If you feed an SB with two
> strings of modules, the 13A limit is likely to be exceeded if it is not
> rated for continuous. With the 165's it's exceeded even at PV 125%.
> 
> Thanks,
> Brad
> 
> 
> William Miller wrote:
> > The rating is for 13 amps per pole.  Is this de rated for continuous, or
> > for PV?
> >
> > Thanks again,
> >
> > William
> >
> >
> 
> 
> 
> 
> Brad Bassett
> Schott Applied Power
> Tumwater, WA office
> bsbassett at earthlink.net
> 
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> 
> 
> 



Brad Bassett
Schott Applied Power 
Tumwater, WA office
bsbassett at earthlink.net

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