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Anonymous Poster #1

Bus Bar Calculation

04/09/2012 4:21 AM

We are manufacturers of LV,MV and automation panels. We have a 3200A 440V AC,50Hz Distribution panel
with 150(mm) x10(mm) x 3 runs busbar system and the busbars have to with stand 50 kA short circuit level. the ambient temperature is 60 degree celcius and IP is IP 55. Please guide me how do i calculate the temperature rise in the enclosure and what is the derating factor to be considered for the busbars.

It would be great help if you could give me the calculation chart.

Thank you. have a nice day
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lyn
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#1

Re: Bus bar Calculation

04/09/2012 5:22 AM

Please give the name of your company.

Do they not have any engineers there?

What country are you in? It might matter.
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TonyS
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#4
In reply to #1

Re: Bus bar Calculation

04/09/2012 10:47 AM

Could be useful information.
It's good to know who to avoid.

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lyn
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#5
In reply to #4

Re: Bus bar Calculation

04/09/2012 10:55 AM

My point, exactly.

I doubt that AP will share that with us.
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TonyS
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#8
In reply to #5

Re: Bus bar Calculation

04/09/2012 3:39 PM

OK my mind went in to overdrive with the thoughts of a sales pitch.

"All our products and rating calculations are verified by a group of anonymous guys on the internet"

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lyn
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#9
In reply to #8

Re: Bus bar Calculation

04/09/2012 3:49 PM

Suggested correction:"All our products and rating calculations are verified by a group of anonymous guys on the internet"

Should be: "All our products and rating calculations are verified by a group of anonymous guys experts on the internet"

That gives us some credibility.
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TonyS
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#11
In reply to #9

Re: Bus bar Calculation

04/10/2012 8:19 AM

We need Stinkypete to add credibility to our expertise.

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Crabtree
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#2

Re: Bus bar Calculation

04/09/2012 7:31 AM

It is somewhat surprising that a <....manufacturers of LV,MV and automation panels...> would not have the protocol immediately to hand and has to resort to responses from an anonymous global internet forum!

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electricalexpert65
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#3

Re: Bus Bar Calculation

04/09/2012 9:58 AM

Oops! Such a big chapter! And you want to know it thro a few lines in this forum!
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wareagle
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#6

Re: Bus Bar Calculation

04/09/2012 2:15 PM

Check here. You will have all the information you need.

http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=bus%20bar%20calculations&srchobjs=t%2Cc&fs=12&order=asc
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jack of all trades
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#7

Re: Bus Bar Calculation

04/09/2012 3:20 PM

You should hire a consultant for two reasons, the first is obvious (you don't seem to know what you are doing), and the second is that I don't think your busbars specified will even handle 50kA for (no duration is given) seconds without breaking the supports through extreme fault current movement stress.

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obouill
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#10

Re: Bus Bar Calculation

04/10/2012 3:09 AM

This is obviously a very complex topic . Temp rise, derating, Short circuit withstand depend a lot on the physical shape and design of the enclosuire, of the complete switchboard configuration (devices, internal connections and partitioning, ....

Designing a switchboard with a sum of partial rules of thumb may well give a completely overdesigned switchboard on many aspects, and probably dangerous one on one aspect you may have overlooked ...

Depending on where you are in the world, you may find switchgear in kit system that will allow to build a switchboard matching all standards .

You may find useful tips on

http://www2.schneider-electric.com/sites/corporate/en/customers/panelbuilders/technical-resources/training.page
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Crabtree (1); electricalexpert65 (1); jack of all trades (1); lyn (3); obouill (1); TonyS (3); wareagle (1)

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