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
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