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    Kingpen's Avatar
    Kingpen Posts: 1, Reputation: 1
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    #1

    Nov 8, 2011, 05:35 PM
    How do you figure three phase amps when all you know is voltage and wattage.
    How do you figure three phase amps. When all you know is the voltage and the wattage. Do not know the PF factor
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Nov 9, 2011, 06:17 AM
    For example, with the following values:

    208 Volts 3 phase

    15000 watts or 15 KVA

    Assume .8 PF

    VA (AC Watts)= E*I*PF*1.73

    I= KVA/E*1.73*PF

    Amps = 15000 watts divide by 208 volts times 1.73 times .8

    Amps = 52.10 amps

    If this is for resistance heat, no need for PF.
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