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Thread: Phase rotation

  1. #1
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    Phase rotation

    Have existing panels and distribution gear being demolished. Loads are Being temped out and then swung over to new panels gear. If there a chance that there could be an issue with phase rotation of motors or elevators once connected to new panels and gear? How do you prevent this or check and fix it if it's out of phase? Thanks

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  2. #2
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    Quote Originally Posted by mstrlucky74 View Post
    Have existing panels and distribution gear being demolished. Loads are Being temped out and then swung over to new panels gear. If there a chance that there could be an issue with phase rotation of motors or elevators once connected to new panels and gear? How do you prevent this or check and fix it if it's out of phase? Thanks

    Sent from my SM-N960U using Tapatalk
    Check the direction of rotation before you couple the motors up.
    Si hoc legere scis nimium eruditionis habes.

  3. #3
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    We would have checked phase rotation at the controllers and tagged them, BK,RD,BL or whatever before removal.
    Tom
    TBLO

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    Use a phase rotation meter on the existing and then make sure that the temp has the same rotation. We use these:

    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  5. #5
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    Quote Originally Posted by ptonsparky View Post
    We would have checked phase rotation at the controllers and tagged them, BK,RD,BL or whatever before removal.
    How does that stop them from going out of phase? What a out motors with disconnects and no controllers?

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  6. #6
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    What the process in checking phase rotation and changing it if need be? Thanks

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  7. #7
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    Read the directions. That is the easiest way. You will need a phase rotation meter and they come with the directions.

  8. #8
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    Ty

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  9. #9
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    We use T+Pros that have a rotation indicator built into them.
    Read The Fine Manual is of course the best method.
    Tom
    TBLO

  10. #10
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    Maybe in the perfect world ABC rotation at the SE means ABC throughout the plant all the way to the motors, but don’t count on it.
    Tom
    TBLO

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