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no common

Discussion in 'Misc Electronics' started by curt, Apr 19, 2004.

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  1. curt

    curt Guest

    Where I live, the electric co. ran 2 wires for 240V. There is NO
    common, each leg is 120V. When I try to use one leg for 120V and add a
    ground for the common, the 2 lines become unbalanced and one line may
    read 80V while the other reads 160V. What can I do to fix this
    problem at my house? can I use capacitors or resistorss of something?
    Thanks,
    curt
     
  2. Roger Gt

    Roger Gt Guest

    X-No-Archive: yes
    "curt" wrote
    : Where I live, the electric co. ran 2 wires for 240V. There is NO
    : common, each leg is 120V. When I try to use one leg for 120V and
    add a
    : ground for the common, the 2 lines become unbalanced and one
    line may
    : read 80V while the other reads 160V. What can I do to fix this
    : problem at my house? can I use capacitors or resistors of
    something?
    : Thanks,
    : curt


    Don't know of any installation in the US, so I assume it is
    somewhere else.

    The only safe way to get a "solid common for 110-120 is to use an
    autotransformer of the N,110,220 style. A single winding
    basically center taped. Usually you would input the 110 and get
    220 out. IN your case, input the 240 and the tap is the common
    for 120 each side. HOWEVER! DO NOT GROUND the "common", a
    separate safety ground will be needed.

    The Auto transformer will have to be large enough, Rated for the
    load on the 120 volt side!

    THIS IS NOT SOMETHING TO BE WIRED INTO A HOUSE UNLESS THE BUILDING
    INSPECTOR APPROVES IT!!!!! IT IS POTENTIALLY LETHAL IF NOT DONE
    PROPERLY!
     
  3. Myron Samila

    Myron Samila Guest


    Where do you live?

    I live in Toronto, and the El Co also only runs two legs of 120V, that is normal. The
    Neutral is picked up via ground. You need to call an electrician.
     
  4. Ken Taylor

    Ken Taylor Guest

    From his headers, the OP appears to be in Venezuela. The vital issue is that
    he doesn't know enough to safely do what he wants, he needs to contact a
    qualified electrician.

    Ken
     
  5. Art

    Art Guest

    Gov: You will need to have a qualified electrician come out and install a
    ground rod at your location, inspect the rest of the interconnects, and
    confirm that indeed it is a good earth ground and the other legs will indeed
    balance. Otherwise you may need to contact Ontario Hydro and ask them
    particularity what you require in your specific location there in T/O May
    need a couple Labatts on hand tho, Eh~~ BTW DO NOT attempt a "RED - GREEN"
    application and repair, it will bite you in a big way!!
     
  6. Myron Samila

    Myron Samila Guest


    hehe, love the Labatts reference, but my electrical is fine!! I didn't realize where the
    OP was in the world.

    Red Green uses duct tape to tape together 1000 MCM wire feeding a 600V 400A 3phase
    service! ;)
     
  7. Art

    Art Guest

    Straight on Gov: Like your web site with the links. Spent too much time in
    Peterborough years back while in College there, not far from tbe old Trent
    Canal. Best regards, hope the Leafs and Wings have a chance at the Cup this
    year, Eh?/ I know, off the flippin thread again, Cheers
     
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