Good points. I would think a more dangerous situation would be the case that you often have with large parallel feeders landing on a single OCPD. If one wire has a little less resistance, it will always run hotter than the other, and you could easily overheat a wire that is protected by that large OCPD. Thanks
On Wed, Sep 26, 2012 at 6:48 AM, Jeff Irish <j...@hudsonsolar.com> wrote: > Code issues aside, even two seemingly identical runs each with breakers > would have at least slightly different resistances, causing the lower > resistance run to take more than half the total current, tripping the > breaker in that run, then causing a tripping of the breaker in the other > run.**** > > ** ** > > Jeff Irish**** > > ** ** > > *From:* re-wrenches-boun...@lists.re-wrenches.org [mailto: > re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *mac Lewis > *Sent:* Tuesday, September 25, 2012 9:16 PM > *To:* RE-wrenches > *Subject:* [RE-wrenches] parallel OCPD**** > > ** ** > > Hello wrenches,**** > > ** ** > > Does anyone understand why you are not allowed to have parallel separately > protected runs of wire.**** > > For example, say I need 120A from point A to point B, why doesn't the code > allow two runs of #6 breakered at 60A each. Its probably obvious, but not > to me...**** > > > **** > > ** ** > > -- **** > > ** ** > > ** ** > > ** ** > > Mac Lewis** > > "Yo solo sé que no sé nada." *-Sócrates*** > > ** ** > > > -- > This message has been scanned for viruses and > dangerous content by *Hudson Valley Computer > Services*<http://www.hvcomputerservices.com/>, > and is > believed to be clean. **** > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > -- Mac Lewis * "Yo solo sé que no sé nada." -Sócrates *
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