The 120% rule refers to source breakers, not load breakers.
On Thu, Dec 19, 2013 at 3:16 PM, 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 > > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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