AIC rating

qcroanoke

Sometimes I don't know if I'm the boxer or the bag
Location
Roanoke, VA.
Occupation
Engineering
If I have a panel with a main breaker of 22,00 AIC does every breaker in this panel have to be rated 22,000 A.I.C.?
Code reference please if there is one.
 

tom baker

First Chief Moderator
Staff member
Not always....you would have to take the available AIC and then calculate the let thru. Your breaker mfg can assist or may have info already done
See 110.9, and 110.10, and in your case it could be a series rated system so review 110.22 B, and then 110.24
 

mayanees

Senior Member
Location
Westminster, MD
Occupation
Electrical Engineer and Master Electrician
As already stated, if the 22 kA breaker is required because there's 22kA available at that panel, then the distribution breakers need to be 22kA-rated, or listed with the main breaker in the series rating tables published by the manufacturer. If there are other 10kA breakers in the panel, then maybe they're series-rated with the main.
The other code reference is 240.86.(B) for tested combinations.
 
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