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therock9211
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Join Date: Feb 2010
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MCCB Rating Calculation

02/03/2010 1:14 AM

please help me calculating MCCB rating for a power factor of 0.9 Load is 70 KW and voltage is 230/400 V +_ 10% and its a three phase supply
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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: MCCB RATING CALCULATION

02/03/2010 3:02 AM

→ British Standard 7671.

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therock9211
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#2
In reply to #1

Re: MCCB RATING CALCULATION

02/03/2010 3:12 AM

please can you elaborate the calculations?
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jack of all trades
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New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

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#3

Re: MCCB RATING CALCULATION

02/03/2010 1:55 PM

What are you having problems with exactly, the information is clearly indicated in the electrical standards and local electrical regulations you should be working to?

Are you not an electrical (technician/electrician/engineer/consultant)? If not you shouldn't be performing this work, ESPECIALLY since you are talking about an industrial application and likely high fault current rating (70kW is not small).

Anyway, the information is also available for free off the internet

http://en.wikipedia.org/wiki/Circuit_breaker

Also try MCCB manufacturer websites for application notes and data sheets (its all there if you look).

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