Eric: Greetings! These panels are called 320 series because the sockets are rated for 320 amps continuous duty.
Your calculations are based on the main OCPD ratings. You can add 40 amps of backfed OPCDs to the internal bus and to the external load center if you use 200A breakers. You can downsize the 200s to add more backfeed amps. William > On Dec 19, 2013, at 11:16 AM, "SunHarvest" <[email protected]> wrote: > > Hi guys - > > Concerning the 120% rule: I've encountered several circumstances recently > where a 400A nameplate-rated (listed on inside label) main panel has two 200A > main breakers. One of the breakers will be feeding the busbar in the main and > the other will feed a subpanel. I had previously thought the main busbar is > rated at the nameplate rating (400A in this case) regardless of quantity of > main breakers. My lead electrician says the main busbar in these types of > panels is derated to 200A because of the split. However, I have two other > reliable electrician friends who disagree with my lead electrician. One of my > C10 buddies says it depends on whether or not the busbar in the main is > broken up into 2 sections (200A) or it is continuous (400A). Can anyone clear > up, beyond doubt, our disagreement? > > Thanks! > > Eric Stikes > SunHarvest > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > 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 >
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