![]() Multiply by 1.25 to estimate required breaker size. Gas ovens: Add motor currents and add 10 Amps for gas combustion blower and controls.On the other hand, for the 3-phase system, you can use S I × V × 3 / 1000 for line-to-line voltage and S. Electric ovens: Add heater current, motor currents, and 5 Amps for control circuit. To convert amps to kVA in a single-phase power system, you can use the formula S I × V / 1000 where the amperage (I) is in amperes, the voltage (V) is in volts, and the resulting apparent power (S) is in kilovolt-amperes or kVA.Look up current draw of each motor according to its voltage and horsepower in the following table: Voltage If you have a powered exhauster, refer to the following table to determine the horsepower of the exhauster motor: Exhauster Size (CFM) Three phase: Total heat input in Watts (kW x 1000)/(Voltage x 1.732).Single phase: Total heat input in Watts (kW x 1000)/voltage.Horsepower of motors (recirculating blower HP can be found on model specifications or quote)Ĭalculate Heater Current (Electric Ovens).Similarly, a transformer (with three windings, each identical) supplying a given kVA will. Size of powered exhaust system in CFM, if there is one The kW per winding (single-phase) has to be the total divided by 3. ![]()
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