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| Series Rating https://brainfiller.com/arcflashforum/viewtopic.php?f=23&t=6011 |
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| Author: | bettereveryday2210 [ Fri Mar 14, 2025 12:55 pm ] |
| Post subject: | Series Rating |
Would the lowest rated breaker be able to be series rated on a MLO panel? See picture https://pasteboard.co/opibe0XafPjG.png |
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| Author: | Jim Phillips (brainfiller) [ Fri Mar 14, 2025 1:57 pm ] |
| Post subject: | Re: Series Rating |
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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| Author: | bettereveryday2210 [ Fri Mar 14, 2025 2:04 pm ] |
| Post subject: | Re: Series Rating |
@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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| Author: | bbaumer [ Sat Mar 15, 2025 5:45 am ] |
| Post subject: | Re: Series Rating |
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. |
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| Author: | mpparent [ Mon Mar 17, 2025 8:28 am ] |
| Post subject: | Re: Series Rating |
As Jim mentioned: be careful about motor contribution. It doesn't take much. Mike |
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