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Designing an Electrical Panel with Brum Solution - Busbar Capacity Query

368 Views 5 Replies 6 Participants Last post by  John Valdes
I need to design an electrical panel, and the main circuit breaker is rated at 250 A. We are implementing a 100% Brum solution for the panel, but Brum's earth and neutral busbars are rated up to 125 A. If I require 20 earth poles, can I use two 10-pole busbars rated at 125 A each? Or does each earth busbar need to withstand the maximum current of 250 A from the main circuit breaker?
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Why in the world do you want to take this on? Are you a decreed electrical engineer with a PE license in your state? You do not state the AIC's required for this panel which tells me you may be in the deep end of the pool and not know it.
I would never do this and be liable for the design until the panel turns to dust.

Wording of your post, are you sure you are in the USA? (earth poles)

I do not have a clue what the Brum solution means or does.
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who me .... im a plumber.

If i had to guess i would say the old boy is asking if its ok on a 250 amps panel to use a 2 brumel 10 spot ground bars to give him 20 landing points as they are only rated at 125A each.
Or at least that what i think he said. I guess hes planning to have some major continuous faults and all 20 circuits have 250amp breakers.

Anyway im going back to turd wrestling with the rest of the plumbers. Im sure someone will come along and write a 20 page response soon @paulengr
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I am guessing this is someone assembling a DIN rail European style panel, I think they call the residential ones "consumer units." It seems like it would be electrically sound to use two 125A busbars as long as the total branch circuits landed there added up to 125A or less - the branch circuit breakers would protect the busbar. Then again it would be a bit error prone, someone could easily come along later and overload one. I guess it would come down to code where ever the OP is. It would have to be a very basic code question, suggesting DIY. Then again, they usually don't have a lot of circuits on their systems, they use rings and 230V L-N systems so 20 circuits sounds like either a very big house or commercial.

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