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MCB characteristics and specification of conductor cross-section | |||
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Electronics & Electrical Engineering Forum |
Posted by: VladM ® 11/10/2010, 01:14:32 Author Profile eMail author Edit |
Miniature circuit breaker (MCB) time-current characteristic has two specific points in the big-times area:
1) 113% of MCB rated amps (current of non-tripping), 2) 145% of MCB rated amps (current of tripping). According to the IEC standards and to the MCB manufacturers catalogues:
The question arises how to coordinate MCB and cable: should the cable long-term admissible current be greater than 145% of MCB rated amps?
What do you think? Isn't it dangerous to size the conductor to 100% of MCB rated amps concerning the fact that MCB will not trip until 113% and may not trip until 145%? Modified by VladM at Wed, Nov 10, 2010, 01:16:05 |
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