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biswasji
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Join Date: Aug 2012
Posts: 10

Starting Current & Switch Rating

09/16/2012 2:11 PM

how to drcide mcb rating considering starting & running current of motor?
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lyn
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Join Date: Oct 2008
Posts: 42355
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#1

Re: starting current & switch rating

09/16/2012 2:18 PM

Starting current. Study the function of MCBs to understand sizing considerations.

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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
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#2

Re: starting current & switch rating

09/16/2012 3:20 PM

Is there an echo in the room?

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lyn
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#3
In reply to #2

Re: starting current & switch rating

09/16/2012 3:28 PM

Just someone in search of instant knowledge.
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nobodysomebody47
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Join Date: Nov 2011
Posts: 171
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#4

Re: starting current & switch rating

09/16/2012 3:40 PM

All about starting current for motor
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Crabtree
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#5

Re: starting current & switch rating

09/16/2012 4:11 PM

Well, I'd use British Standard 7671, Murgatroyd, then, I'm funny that way.

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obouill
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Location: Grenoble, France
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#6

Re: Starting Current & Switch Rating

09/17/2012 3:05 AM

http://www.electrical-installation.org/enwiki/Basic_motor_protection_scheme:_circuit-breaker_%2B_contactor_%2B_thermal_relay
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electricalexpert65
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Join Date: Oct 2009
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#7

Re: Starting Current & Switch Rating

09/17/2012 9:22 AM

I would strongly advise against using an MCB in a motor feeder.
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pnaban
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Join Date: Jun 2010
Location: srilanka
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#8

Re: Starting Current & Switch Rating

09/18/2012 12:48 AM

Refer manufacturer's literature from Merlin Gerin,F & G etc

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Crabtree (1); electricalexpert65 (1); lyn (2); nobodysomebody47 (1); obouill (1); pnaban (1); Tornado (1)

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