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I have a 100-ampere, 22KA load center (panelboard) with a 100-ampere 22KA breaker and on the prints it says (100-ampere main lugs min. AIC 22,000) do all the breakers have to be 22 K AIC breakers?
Usually the panelboard manufacturer and the listing of the equipment provide the answer to this question. We recommend referring to the manufacturer's installation instructions regarding the breaks that can be used in the panelboard to maintain the 22 K AIC rating. Usually a panelboard has a short circuit current rating that is the equivalent of the lowest breaker AIC rating installed in the panelboard. For example, the panelboard may have an overall rating of 22 KAIC, but if 10K AIC rated breakers are installed, the overall AIC rating would be 10K. This response does not address any panelboards that may be applied in a series rating combination that is addressed in Section 110.22(B)( or (C). Refer to Section 110.3(B) and the short circuit current rating information marked on the panelboard labels and installation instructions.
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