Has anybody heard of this ? Arc interupting current chart for breakers.

You'll have to explain a bit more. AIC ratings are the amp interrupting current that is part of every circuit breaker or fuse assembly. They start around 10,000AIC and go up to 200,000 AIC.

Im sorry i wasnt specific . My boss needs to figured out how to find the arc fault rating for a breaker. Is there some sort of formula?

I'm not sure what you mean by arc fault rating. If you mean amps interupting capacity, you would find that information molded into the case of the breaker or printed on a small sticker attached to the breaker. If there are no markings, the AIC is 5000 amps. If you don't have the breaker in question on hand, the information is usually available in the manufacturers catalog.

AIC requirements are requested/required by most AHJ's.

AIC formulas are to involved to include here, but try the Bussman website. They should have the info either as downloadable, or you could request the booklet.

It's math, not to deep, and their method is acceptable.

AIC ratings of various CB's are available from the mfg; there is a lot of useful info within most catalogs, trip curves, etc.

John

AIC ratings (which apply to protective devices)are determined through testing by an NRTL.

SCCR (short circuit current rating) for panels my be determined by testing or design.

SCA (short circuit amps) may be calculated for various points in an electrical system.

Arc flash incident energy values may be calculated by knowing the SCA at a specific point and the time current charecteristics of the overcurrent device protecting that point.