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    rsbmwrider's Avatar
    rsbmwrider Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 14, 2013, 02:18 PM
    Three phase 480V
    We have a 208V Three phase panel at work. It is fed through a 480 V panel with a step down transformer.

    In the 208 panel I read 208 V between each phase. I read 120V to neutral on each.
    When I measure each phase to ground, the center phase reads 50-70 volts! The outer ones still read 120V. What's going on?


    Thanks
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #2

    Nov 14, 2013, 03:50 PM
    Okay, are you having a problem or are you questioning the voltages you are reading?

    A 208 Vac, three phase is nothing more that 120 separation of phases.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #3

    Nov 14, 2013, 05:56 PM
    You had a bad test point for that phase.

    My I ask why you are checking this, and what your position is at this place?
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