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sivasankar
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Join Date: Nov 2010
Location: bangalore
Posts: 1

Selecting the Circuit Breaker Rating

11/20/2010 6:27 AM

How to select the circuit breaker rating ? in my project connected load is 2451KW ,maximum demand 1960KW(@ diversity of 1.25).Its based on connected load or maximum demand?

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Pathfinder Tags: Circuit breaker rating
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kvsridhar
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Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2744
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#1

Re: Selecting the circuit breaker rating

11/20/2010 7:26 AM

The CB needs to be selected according to the current it has to handle. You need to calculate based on kVA, not kW. Moreover, the CB is a protective device, and it must have short-circuit ratings adequate for your application.

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msamad
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Join Date: Feb 2009
Location: Houston, USA
Posts: 946
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#2

Re: Selecting the Circuit Breaker Rating

11/20/2010 5:39 PM

This thread may help: http://cr4.globalspec.com/thread/36311/Sizing-Circuit-Breakers

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Anonymous Poster
#3

Re: Selecting the Circuit Breaker Rating

11/21/2010 2:59 AM

You have a project, connected load, maximum demand already. So there will be details of Circuit breaker also available. Better you search your college books to know How to select a fuse or breaker. Correct way of saying the diversity factor is percentage of connected load. so in this case - at 0.8.
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