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When calculating kilowatts from known amps on a 3 phase circuit do you use 415 volts or the 240 line volts in the equation?
Wiki User
∙ 14y ago
You can use either. I assume the 240 volts is the line to neutral voltage, and the 415 is the line to line voltages. They will both give you the correct answer. It is important to note these values are RMS, not 0 - peak voltages, but this may be beyond your question. The equations below are for calculated from RMS values (both voltage and current).
If you are using a L-L voltage, P = I*V*sqrt(3)
If you are using the L-N voltage, 1-phase power P = I*V (for the power in a single phase, for all three, multiply by 3), or 3phase power P = 3*I*V
You will get the same answer, since the L-N voltage is (1/sqr(3)) times the L-L voltage.
Wiki User
∙ 14y ago
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The equation you need to find amperage when kilowatts are known. Amps = kW x 1000/1.73 x volts x PF. Use .9 as a Power Factor constant.First megawatts must be changed to kilowatts. 1000000/1000 = 1000 kilowatts. Amps = 1000 x 1000/ 1.73 x 480 x .9 = 1000000/747 = 1338.6 amps.
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