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Old 06-24-2019, 06:36 PM   #1
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Default New sub panel AIC rating?

Hi,

I have an existing 120/240V 200amp main panel. I did a 120/240V 90amp sub panel connected to the main. The city's inspector asked me what is the sub panel AIC rating. Where can I find the AIC rating? Is the sub panel AIC rating same as the main panel?
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Old 06-24-2019, 06:40 PM   #2
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Old 06-24-2019, 08:26 PM   #3
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What kind of contractor are you running now .?


I know California have few verison of contractor type

the answer will varies depending on which type of contractor you are.
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Old 06-24-2019, 09:38 PM   #4
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Quote:
Originally Posted by keithxie View Post
Hi,



I have an existing 120/240V 200amp main panel. I did a 120/240V 90amp sub panel connected to the main. The city's inspector asked me what is the sub panel AIC rating. Where can I find the AIC rating? Is the sub panel AIC rating same as the main panel?


On the 90 amp breaker.
Assuming you put a 90 amp breaker in the 200 amp main panel to feed the sub panel.


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Old 06-24-2019, 09:58 PM   #5
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Schneider says the AIC of the panel is the value of the branch circuit breaker with the lowest AIC rating.
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Old 06-24-2019, 11:45 PM   #6
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Some fuse manufacturers developed an app for calculating the AIC for equipment. I have one by Eaton that I forgot how to use.
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Old 06-25-2019, 12:45 AM   #7
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As noted above, the lowest rating of any breaker is the AIC of the entire panel.

I've never seen a modern breaker that has a rating of less than 10,000 amps so that would be the rating the inspector is looking for.

What feeds the 200 amp panel? It's very rare for a basic resi 200 amp panel to be fed with a source capable of more than 10,000 amps but it can happen.

Last edited by micromind; 06-25-2019 at 12:47 AM.
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