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ammarkhan
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Join Date: Aug 2010
Posts: 5

Selection of Main Breaker for Starters

10/13/2010 1:25 PM

Hi Friends,

How can i calculate the rating of main breaker for motor starters, DOL starters and Star-Delta Starters?

Thanks,
Ammar
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Paulusgnome
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Join Date: Oct 2007
Location: Christchurch, New Zealand
Posts: 328
Good Answers: 29
#1

Re: Selection of Main Breaker for Starters

10/13/2010 4:10 PM

This is one of those questions that, if you have to ask it, you probably aren't qualified to do the work, and should hand it on to someone who is qualified.

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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
Location: Richland, WA, USA
Posts: 21017
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#2

Re: Selection of Main Breaker for Starters

10/13/2010 6:06 PM

Consult your local electrical code/regulations. They will have something such as multiplying the full load current by a specified number, which may depend on the type of circuit breaker being used.

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kvsridhar
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Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2744
Good Answers: 164
#3

Re: Selection of Main Breaker for Starters

10/14/2010 12:29 AM

If you need Type 2 co-ordination as per IEC, the recommendation must come from the supplier of contactor+relay. Usually, reputed manufactureres also make MCCBs and publish co-ordination tables.

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