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    JAK2468's Avatar
    JAK2468 Posts: 1, Reputation: 1
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    #1

    Dec 11, 2007, 04:26 PM
    Convert 208v to 480v
    We bought a 20kW UPS that is designed for 480V 3 phase. We are moving to a building that is only wired for 208V. Is there any way to convert 208 3phase to 480 volt 3 phase or will we need to scrap the UPS?
    vodoc's Avatar
    vodoc Posts: 6, Reputation: 1
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    #2

    Dec 11, 2007, 04:35 PM
    You can buy a transformer, and get a qualified electrician to install it.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Dec 11, 2007, 04:41 PM
    No scrapping needed. Use a larger than 20 KVA 480 V to 208 volt Delta 3 phase transformer as a step up to supply the UPS.

    Add the additional internal KVA of the UPS + 25%, and add that to the 20KVA output capacity of the UPS to size the transformer.

    Be sure the transformer is K Rated. This is a beefier unit built to handle harmonics.

    Take consideration of cooling , do not install the new transformer in an IT room.
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