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  • 3 Phase question

    A few years ago, when I wired my shop , some of my equipment was 440/220 VAC 3 phase. So I wired my shop accordingly using power supplied from my phase converter.
    I now have a need to run a small single phase 220/230 vac motor at one of the location where 3 phase only power is available.
    The question is: Can I use one leg of the 3 phase power to run my single phase motor without and rating decoration?

  • #2
    Actually, I believe you would use two (2) legs of the three phase power supply to run your single phase 220/230 volt motor.
    Dom

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    • #3
      Use the two wires from the supply that go thru the converter not the created leg should work fine.
      re
      Herm Williams

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      • #4
        Yup. Make sure you use the line legs for single phase loads not the generated leg.

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        • #5
          Originally posted by JCD
          A few years ago, when I wired my shop , some of my equipment was 440/220 VAC 3 phase. So I wired my shop accordingly using power supplied from my phase converter.
          I now have a need to run a small single phase 220/230 vac motor at one of the location where 3 phase only power is available.
          The question is: Can I use one leg of the 3 phase power to run my single phase motor without and rating decoration?
          What do you mean by "without and rating decoration"?

          "...the location where 3 phase only power is available." This pretty well means there is no converter or generated leg.

          What are the characteristics of the 3 phase power?
          Location: Saskatoon, Saskatchewan, Canada

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          • #6
            "decoration" means: a typo was made. The word should have been: degradation.

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            • #7
              If you use two phases of 3 phase, you get 208v insted (Assuming its 120v 3 phase) of 240v, so you will loose a little bit of HP.
              There are 208v:240v autotransformers if its really critical.
              Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

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              • #8
                Originally posted by Black_Moons
                If you use two phases of 3 phase, you get 208v insted (Assuming its 120v 3 phase) of 240v, so you will loose a little bit of HP.
                There are 208v:240v autotransformers if its really critical.

                Ummm.......... NO!

                If he has created 230/240 from the split 115/120V line, he will get the full 230/240 voltage across any two lines, although he needs to use the two that he powered the converter with.

                208V is a line-to-line DELTA voltage, which happens to correspond with 120V WYE voltage. Only if he has a 208 line will be get 208 out, but he already said he had a phase converter making 220V, so presumably he has 120/240 input.

                But if you start with the 230/240 single phase input to your converter, THAT is your line-to-line voltage.
                1601

                Keep eye on ball.
                Hashim Khan

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