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

    Dec 11, 2009, 11:12 AM
    Is it a 3 phase 208V or 1 phase 208V system?
    From a NEMA L6-30 3-prong connector in the lab, it measures 212V btwn two prongs and 122V btwn any of the two prongs to the third prong. Based on this info alone, is it a 3 phase 208V system or a 1 phase 208 system?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Dec 11, 2009, 01:50 PM
    The L6-20 receptacle is providing single phase 208 volt service between the two live terminals with the 212 volts, the third terminal is the equipment ground.

    This circuit comes from a 120/208 volt 3 phase 4 wire system.
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