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Thread: Panelboard AIC rating

  1. #1
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    Panelboard AIC rating

    I have panel 240/120V installed in 208/120V service. No 240V loads. Panel rated AIC rating at 240V is 10ka. What would be the AIC rating at 208V?

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  2. #2
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    10ka ?? Seems exceptionally low.
    As is often the case with your questions, the devil is in the details.
    Provide us with manufacturer and catalog number and I'm sure some of the panelboard experts here can provide an answer.
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  3. #3
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    I don't think I have ever seen the AIC specified at a voltage less than 240. In my opinion, it is still 10,000 amps at 208.
    Don, Illinois
    (All code citations are 2017 unless otherwise noted)

  4. #4
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    Wouldn't the AIC rating be the same as when the panel was still in the box it came in?
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  5. #5
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    We have to be more precise here. A Panelboard doesn't have an AIC rating - the breakers do. I have seen larger frame breakers give AIC at 208 vs 240, but I don't recall seeing this for miniature circuit breakers.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  6. #6
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    Quote Originally Posted by electrofelon View Post
    We have to be more precise here. A Panelboard doesn't have an AIC rating - the breakers do. I have seen larger frame breakers give AIC at 208 vs 240, but I don't recall seeing this for miniature circuit breakers.
    I would agree. If you have a panel with a SCCA of 10K, even you had 22K AIC breakers it is still limited to 10K.

  7. #7
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    Quote Originally Posted by texie View Post
    I would agree. If you have a panel with a SCCA of 10K, even you had 22K AIC breakers it is still limited to 10K.
    I would think (but can't say for sure) that Panelboards have a sccr no lower than the highest AIC breaker that fits. I think this would be 22k for resi panelboards /loadcenters.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  8. #8
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    Good question. Generally, I think it should list at 208V to be certain of the listing. Technically probably 15% lower than then 240V kAIC rating.

  9. #9
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    Quote Originally Posted by publicgood View Post
    Good question. Generally, I think it should list at 208V to be certain of the listing. Technically probably 15% lower than then 240V kAIC rating.
    Usually the AIC goes up as the voltage goes down.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  10. #10
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    AIC is the highest level of current (A) the breaker is listed to withstand and open/clear durring a bolted fault. This value is not given in Volt-Amps (VA) otherwise the value would be different in relation to the voltage the breaker is connected to.

    SCCR is the highest level current an enclosure is listed to endure/contain should a bolted fault occurs with-in.

    Hence why we should know what the max available fault current is that’s supplied by utility so equipment is matched up so not to disintegrate.

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