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    joelmchan's Avatar
    joelmchan Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 21, 2013, 07:38 AM
    I have low voltage one one of the 120 line of a 240 voltage supply why?
    I have 240 supply coming from my supplier. 3 wires 120 volts , 120 volts, and neutral. As soon as I turn on my breaker one of the 120 line goes low to something like 65 volts and the other lines goes high to 170 volts. Why is that?
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #2

    Nov 21, 2013, 09:38 AM
    How are you taking you voltage measurements?
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #3

    Nov 21, 2013, 10:09 AM
    Help us a little, please.

    By supplier, do you mean the electric utility company? Are you measuring the voltage at a main service panelboard in a residence?


    Have you contacted the power company to have them verify the connections and the supply side of their equipment?

    Have you shut all of the breakers off in the panelboard and then turned the main breaker on so that you can see if any one particular branch circuit is causing the problem?
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
    Ultra Member
    		  
    #4

    Nov 21, 2013, 10:22 AM
    This type of imbalance is typically a loose neutral problem...
    Before you damage anything call an electrician...
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