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

    Apr 11, 2013, 07:32 PM
    480 volts transformer step down to 208v otls
    What size of step down transformer I should use if the existing 480volts from the Main Panel is 70amps? I can use 70amps as my step down size transformer?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Apr 12, 2013, 04:03 AM
    What does your electrician suggest?
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #3

    Apr 12, 2013, 04:06 AM
    You could install any transformer 45 kVA or larger...
    But "don't" do that before you have some idea of the load or equipment to be connected to it.
    If this is for future use and the future load is unknown it would be more appropriate to size the overcurrent device to the transformer, not the other way around.
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