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Anonymous Poster

breaker size

07/08/2009 2:43 AM

hi ,i m sorry i did a mistake,the rated current is 124A & full load current is 18.60A, now which one should be considered for the load cal ,& breaker size sellection.

thank you every body
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Anonymous Poster
#1

Re: breaker size

07/08/2009 3:51 AM

http://cr4.globalspec.com/thread/40178/breaker-size-calculation
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Anonymous Poster
#2

Re: breaker size

07/08/2009 5:34 AM

This information also wrong.

A motor rated at 124 A and full load is 18.6 A that mean the motor less than 15KW motor.

Please double check the amps again
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jack of all trades
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#3

Re: breaker size

07/08/2009 4:01 PM

This is elementary electrical protection theory every electrician knows. Please get a professional to do the design and installation for you before you kill yourself and/or others as you are clearly not qualified to perform this type of work.

If this is a homework question, this is not a homework cheat site.

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Anonymous Poster
#4

Re: breaker size

07/09/2009 7:15 AM

It's not the size of your breaker, it's how you use it.
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Jerry New Hampshire
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#5

Re: breaker size

07/09/2009 2:07 PM

Back in the dawn of time, I worked in an old mill that ran all 220v delta 3-phase. All the motors were fused for 10 amps / hp. I was told that this was for start-up current, but they would only draw 3 amps / hp at full load. This I confirmed by cleaning numerous data plates and reading them for run current. (Last patent dates on some of these motors was 1913.)

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