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Thread: Convert 480V current to 208V current

  1. #1
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    Convert 480V current to 208V current

    Hello,

    Is there a specific equation I can use to convert amperage in 480V to 208V? I've been searching the web but can't find a precise formula to use.

    Thanks

  2. #2
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    ?????

    V480 x I480 = V208 x I208
    for constant power
    The difference between genius and stupidity is that genius has its limits.

  3. #3
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    Are you trying to figure transformer primary/ secondary?

  4. #4
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    You could just do a ratio of the 480 volts to 208 volts. For volts 480/208 or 2.3 to 1. For amps 1 to 2.3.

    Ex. 480v and 10 amps = 208v and 23 amps.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  5. #5
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    Quote Originally Posted by baserunner4 View Post
    Hello,

    Is there a specific equation I can use to convert amperage in 480V to 208V? I've been searching the web but can't find a precise formula to use.

    Thanks
    If they are both single phase or both three phase, you just multiply the current on the primary side by 480 volts, then divide by 208 volts.
    Electricians do it until it Hertz!

  6. #6
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    Quote Originally Posted by baserunner4 View Post
    Hello,

    Is there a specific equation I can use to convert amperage in 480V to 208V? I've been searching the web but can't find a precise formula to use.

    Thanks
    what are you a student of?
    this is one of the most basic principles
    P in = P out for a xfmr (or any device, in this case elec:elec, sometimes elec:mech or the inverse, sometimes thermal:mech, etc)
    P = i x v for 1 ph and sqrt3 x i x v for 3 ph
    The difference between genius and stupidity is that genius has its limits.

  7. #7
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    Quote Originally Posted by baserunner4 View Post
    Hello,

    Is there a specific equation I can use to convert amperage in 480V to 208V? I've been searching the web but can't find a precise formula to use.

    Thanks
    Yes. I @208V = I @480V (480/208)

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