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bettereveryday2210
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Post subject: Series Rating  Posted: Fri Mar 14, 2025 12:55 pm |
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Joined: Fri Mar 14, 2025 12:52 pm
Posts: 2
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Jim Phillips (brainfiller)
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Post subject: Re: Series Rating Posted: Fri Mar 14, 2025 1:57 pm |
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1727
Location: Scottsdale, Arizona
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Series ratings between circuit breakers is determined by tests such as U.L. Therefore you have to consult the circuit breaker manufacture to see what combinations will work. Also, the NEC prohibits series ratings if there is any short circuit current such as motor contribution, being introduced between the two devices that exceeds 1% of the interrupting rating.
Check with the circuit breaker manufacturer's website. They should have the combinations listed.
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bettereveryday2210
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Post subject: Re: Series Rating Posted: Fri Mar 14, 2025 2:04 pm |
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Joined: Fri Mar 14, 2025 12:52 pm
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@jim
Thanks Jim, I shouldve clarified. I have checked and they are series rated, but my question was more so for the configuration of the consectuive MLO panels
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bbaumer
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Post subject: Re: Series Rating Posted: Sat Mar 15, 2025 5:45 am |
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Joined: Fri Jul 08, 2016 10:01 am
Posts: 438
Location: Indiana
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Yes, for all three of your MLO panels and the feeder breaker as there are no other fuses or breakers in between. At least that is my understanding.
_________________
SKM jockey for hire
PE in 17 states
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mpparent
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Post subject: Re: Series Rating Posted: Mon Mar 17, 2025 8:28 am |
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Joined: Thu Apr 18, 2019 11:42 am
Posts: 163
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As Jim mentioned: be careful about motor contribution. It doesn't take much.
Mike
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