P= V x I Cos Ξ¦ for 1 phase load . Rated Load Current = P / (1.732 x V x Pf x Eff) I= 90000 / (1.732 x 415 x 0.8 x .99 ) =90000/540= 157 amp ~ 157 A. in ideal case 157 amp shall be current capacity of cable and if we look at the cable size chart we will find that for 157 amp the current rating cable size 70mm2 cable size would be perfect. Basically you have to add a 1.73 factor for a 3-phase circuit (presuming the power factor is 1). In your case, the 80 kVA 220V generator would produce 363.64 amps if you use a 1-phase circuit. With a 3-phase circuit, you have to divide the amps by 1.73, yielding 210.20 amps. Hope this makes sense. Reply Customer 7500 watts at 240 volt SINGLE phase is 31.25 amps (watts divided by volts)---7500 watts / 208 volts=36.06 times 1.732 is= 62.46 amps----shouldn't the amperage on 3 phase be lower than single phase ??? Jason : Now that I look at it again, I believe we are both misapplying the formula.
Lineto line voltage I (A) = 1000 x S (kVA) / (√3 x V L-L (V)), which means that the phase current in amps is calculated by multiplying 1000 by the apparent power in kilovolt-amps dividing the result by the square root of three multiplied by the line to line voltage RMS in volts Line to Neutral Voltage I (A) = 1000 x S (kVA) / (3 x V L-N (V
75 kW to Amps Conversion (7.5 kilowatts to ampere, kW to amps) - MyCalcu. Conversion.
Toconvert amps to kVA in a single-phase power system, you can use the formula S = I Γ— 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. On the other hand, for the 3-phase system, you can use S = I Γ— V Γ— √3 / 1000 for line-to-line voltage and S
Table3 – Single Phase AC Kilowatts to Amps (kW to Amps) at a P.F. of 0.9 Motor Current Ratings (Three-Phase AC) Motor current ratings based on kilowatt output at 120, 208, 240, 277, and 480 volts three-phase AC with an efficiency of 0.8 and a power-factor of 1. Power Current at 120V Current at 208V Current at 240V

P= I x V x PF x 1.732 / 1000 to calculate amps 3 phase heater draw. Again, you don’t have to multiply or divide by 1,000. It depends on whether you prefer watts or kilowatts. Either

Assumingit is a 400 V three-phase motor, the phase current is 11 amps, or more if the power factor is less than 1.0 (or the supply voltage is different). If it is a 400 V motor the cable should B1yXJ.
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    • 7.5 kw to amps 3 phase