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    Watt guy's Avatar
    Watt guy Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 15, 2012, 09:33 PM
    Lighting
    I have a one KVA step down transformer that is 277v to 120 volt. How many watts of Christmas lights can I run on it?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Dec 16, 2012, 06:15 AM
    Where are you using a 277V transformer?
    shuntripper's Avatar
    shuntripper Posts: 180, Reputation: 8
    Junior Member
    		  
    #3

    Dec 16, 2012, 07:39 AM
    where he works no doubt.

    transformer basic principle is power in=power out

    1000/277=3.6A draw

    1000/120=8.3A load side.

    do not exceed this, transformer needs overload protection.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #4

    Dec 16, 2012, 07:54 AM
    Simple answer to the question is the 1 KVA transformer, no matter the voltage, can handle 1000 watts, without getting into the difference between kW and kVA.

    If someone is dealing with 277 volts at a commercial or industrial facility, they should not be asking questions here, they should be properly trained and qualified to deal with this voltage.

    If someone is intending on using a 277 volt transformer at home, we need to know this piece of information, hence the reason Stan is asking "where", and this person should be advised to stop until we know all the details.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #5

    Dec 16, 2012, 08:01 AM
    If someone is dealing with 277 volts at a commercial or industrial facility, they should not be asking questions here, they should be properly trained and qualified to deal with this voltage.

    If someone is intending on using a 277 volt transformer at home, we need to know this piece of information, hence the reason Stan is asking "where", and this person should be advised to stop until we know all the details.
    Thank you for posting this.
    I had a post just like this all ready to go and let it slide. I didn't feel like dealing with the repercussions.
    Thank you for posting this.
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