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

    Feb 21, 2012, 09:04 AM
    3 phase vs single phase
    Can a 3 phase appliance (commercial convection oven) be converted to single phase?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Feb 21, 2012, 11:55 AM
    Many can, depending on how they are built. A 3 phase oven usually is nothing more than three single phase heating elements.

    Be sure there is not a 3 phase fan motor, or some other 3 phase device in the oven.

    Also be sure to understand how to do the load calculations, as the amp draw will change.

    A 30 KW 3 phase unit will draw 75.79 amps at 208 volt 3 ph.

    A 30 KW 1 phase unit will draw 144.23 amps at 208 volt 1 ph.

    To size the feeder, increase the load by 25%.

    One other issue is UL Listing. If the unit is built and labeled strictly 3 phase supply, then using single phase to feed it will violate the UL Listing, and you legally will not be able to change the feed.
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