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A I C rating charts #64146
03/31/06 05:28 PM
03/31/06 05:28 PM
D
drgnz23  Offline OP
Member
Joined: Feb 2002
Posts: 56
los angeles
Has anybody heard of this ? Arc interupting current chart for breakers.

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Re: A I C rating charts #64147
03/31/06 05:59 PM
03/31/06 05:59 PM
R
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
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.


Ron
Re: A I C rating charts #64148
04/04/06 07:16 PM
04/04/06 07:16 PM
D
drgnz23  Offline OP
Member
Joined: Feb 2002
Posts: 56
los angeles
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?

Re: A I C rating charts #64149
04/04/06 07:40 PM
04/04/06 07:40 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
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.


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Re: A I C rating charts #64150
04/05/06 05:45 PM
04/05/06 05:45 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,997
Brick, NJ USA
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


John
Re: A I C rating charts #64151
04/05/06 09:37 PM
04/05/06 09:37 PM
J
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
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.


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