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Bookmark or Share- Calculating AIC rating of Panel - Electrician TalkThe first rating I remember seeing was 5000 AIC. Using your example you would need to know the trip curve of the main breaker/fuse, then the feeder breaker/fuse for each panel, length, size and type of wire to the panel. Or are you trying to coordinate the trips on the breaker where a 20 amp does not shut the facility down.
- AIC. what to do? | Page 2 | Electrician TalkBig John said: You can ball-park it. Divide 100 by the transformer impedance, and multiply the result by the transformer single-phase full load current. E.g.: 480V 75kVA 2% impedance. 156A full load current. 100 / 2% * 156A = 7,812A short-circuit current. This method makes a lot of assumptions:
- Is AIC Rating the same as AIR? - Electrician TalkMany breakers are rated at multiple voltages, with an AIC that increases as the voltage drops. As long as the breaker is rated for your system voltage, and the available fault current doesn't exceed the AIC or series rating, you're good. Spend $75 to keep yourself safe. Always wear your gloves. The_Modifier, micromind and gv703.
- AIC. what to do? - Electrician TalkDivide 100 by the transformer impedance, and multiply the result by the transformer single-phase full load current. E.g.: 480V 75kVA 2% impedance. 156A full load current. 100 / 2% * 156A = 7,812A short-circuit current.
- AIC Breaker Ratings - Electrician TalkBreakers with higher AIC ratings have upgraded parts to increase the fault current interupting capability, which costs more to do. How that is accomplished varies depending on what type of breaker you are refering to. No trees were killed in the sending of this message, but a large number of electrons were terribly inconvenienced.
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