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sauravbabu
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Engineering Fields - Electrical Engineering - New Member

Join Date: Dec 2009
Posts: 247

Derating of Busbar in Its Sizing

11/23/2011 5:52 AM

why is derating used in busbsar for its sizing?

regards,

sks
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: derating of busbar in its sizing.

11/23/2011 5:59 AM

So that it doesn't melt. Or flap about.

http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=busbar%20sizing&order=asc

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electricalexpert65
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#2

Re: Derating of Busbar in Its Sizing

11/23/2011 9:53 AM

When a bus bar manufacturer gives the current rating for different bus bar cross sections, he assumes a certain standard conditions of installation & operatio, like ambient temperature, open bus bars, skin effect & proximity effect. But, during the actual installation and/or operation of the bus bar, following the standard conditions may not be possible. You arrive at a compromise by de-rating the bus bar to achive the most cost-effective sizing.
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wareagle
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Location: Alabama
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#3

Re: Derating of Busbar in Its Sizing

11/23/2011 12:06 PM

Not good to have it "flap about"
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
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#4
In reply to #3

Re: Derating of Busbar in Its Sizing

11/23/2011 6:25 PM

Seen it, I agree, not good.

"Run away!"

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