Chanllenger Pnl, Cut Ham breaker --series rated?

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donw

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Arizona
I understand that Cuttler Hammer took over Challenger support. I have a situation where an electrician installed a 10KAIC rated Cuttler Hammer BR120 breaker in an old Challenger panel. After the City caught the owner for work without a permit, I'm called in to do the engineering. My fault calcs place the fault at the panel at just under 22KAIC. The Challenger panel lists several old Challenger breakers which would be series rated to 22KAIC, but of course they aren't available any more. Now I have found where the new BR120 breaker would be series rated with the upstream class T fuses in a Cutler Hammer load panel, but I can't find anything on Challenger. Now, CH does make a BRH120 that is fully rated 22KAIC. What would you do?
 
Thanks wawireguy. My only concern is that series ratings are given based on testing. Now I don't see how much the panel matters in the testing (the breaker seems more important), but they always list the panel/breaker combination that was tested.
 
The panel takes on the rating of the circuit breaker or the internal bussing whichever is lower. If you feel that the bussing can withstand 22kA and the EC installed a CH breaker that has a series rating for 22kA with an existing upstream fuse, then the only thing left is to provide the label required in 110.22
 
Ron, sounds good to me! The Challenger panel has a label that shows various combinations of Challenger breakers that would allow for 22KAIC, so the bus should withstand 22K with the proper breaker/upstream fuse.
 
You guys realize that the "field electrician" doesn't have this degree of knowledge. Challenger panel. Need 20amp breaker. BR120. Good to go. Customer can't pay for a engineer to worry about a 20amp breaker.. I appreciate you guys but we are talking bout a 20amp breaker here..
 
wawireguy, not trying to put anyone down at all, but around here, all tenant improvements on commercial properties have to have sealed, engineered drawings.
 
BR120 isn't a commercial breaker breaker round here. Course we do use it from time to time in those apps. Good to know you guys are on the job : )
 
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