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What is the computation of the main circuit breaker for the 3 phase line?

April 26, 2017breaker circuit computation Engineering main Mathematics phase

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What is the computation of the main circuit breaker for the 3 phase line?

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The circuit breaker should be rated at less than the max capacity of the cable connecting the power to the appliance. There is no computation as such, if you appliance draws 10A you need a breaker of a little over 10A and cable that can carry a minimum current of the breaker rating.