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What is the breaker size for a 10 KVA electric heater?


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Wiki User
2008-03-19 00:28:41
2008-03-19 00:28:41

15 amps

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75000va / 480v = 156.25A 156.25A * 125% = 195.31A I would size the breaker at 200A

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What size breakers are needed for a 30kva transformer 208 volt feed 600 volt out put

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An exact breaker size can not be given because the voltage, and hence the calculation for current, is not given. A transformer shall be protected by an over current device that is not rated at more that 150% of the primary current.

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Cable is not rated in kva.

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The question isn't the number of amps total on your branch circuits, but rather, what your MAIN breaker(s) are rated at. This will determine what size of generator you will need. And be certain that the generator is 3-phase. <<>> The formula you are looking for is Amps = kva x 1000/1.73 x voltage.


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