The conductors have to be rated for 200A as normal. Fault current can only come from the grid. While the total available current on the bus of a panel is the total of the source breakers, in the conductors, grid and solar power cancel out and the total is not the sum of the two.
On Tue, Mar 4, 2014 at 1:05 PM, Kirk Herander <k...@vtsolar.com> wrote: > Hello, > > I have a 225 amp 3-phase main lug sub-panel protected by a 200 amp > breaker. My inverter breaker feeding the sub panel is 60 amps. So 225 a bus > x 1.2 = 270 amps. That's less than the sum of the two breakers of 260 amps, > so no issue there. The conductors between sub and main panel have to be > rated for at least 260/1.2 = 217 amps, correct? Is this 217 amps before or > after derating the conductor? > > > > > > Kirk Herander > > VT Solar, LLC > > dba Vermont Solar Engineering > > NABCEPTM Certified Inaugural Certificant > > NYSERDA-eligible Installer > > VT RE Incentive Program Partner > > 802.863.1202 > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & 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 > > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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