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220V to 110V ?

Discussion in 'General Electronics' started by Chris, Aug 2, 2004.

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  1. Chris

    Chris Guest

    I have an office where I am blowing the fuse from time to time. I
    want to see if I can run my 110V air conditioner on the 220V outlet in
    the office that isn't being used for anything.

    I understand that there can be some problems with frequency when doing
    this type of thing, if you are trying to use a monitor or TV or
    something, but I am just hooking up an air conditioner.

    Someone told me that I could just rig up something by leaving one of
    the 2 live prongs out, and wiring it to a normal 110v plug. Is that

    Otherwise, where could I buy something that would do the conversion?
    I saw this site:,
    but it looks like there is no plug for fitting into the 220v outlet,
    which has one of the prongs at a perpendicular to the other, as
    opposed to both being parallel.

    Any thoughts?
  2. scada

    scada Guest

    The 220 Volt receptacle is actually two 120 volt circuits. It must be a 4
    wire type circuit not 3 . 4 wire circuits have an independent neutral, a
    ground, and the two "Hot" legs that are 110 V from opposing poles! In
    addition to that, the breakers must be of the proper current rating, and the
    wire of the proper size! Yes it can be rewired (if 4 wire) to provide 110
    VAC, but You do not now enough to rewire yourself! Please consult a licensed
    Electrician, it is very dangerous to do without fully understanding!
  3. Plugging a 110V appliance into a 220V outlet will destroy it. The trick of
    connecting the 110V appliance to one live wire and ground, only worked for
    3-phase 220V nets. They had about 220V between two phases and 127V between
    each phase and ground. Modern 3-phase nets (in Europe) have about 400V
    between two phases and 230V between each phase and the common that's
    connected to ground at the distribution transformer. There is 220V between
    phase and ground as well but it cannot be used due to the earth leakage
    circuit breaker installed in common house installations. The only way to
    become a save 110V from 220V is using an (auto)transformer. If you really
    need 110V/60Hz you'll have to get a converter.

    petrus bitbyter
  4. Chris

    Chris Guest

    This outlet only has 3 wires. Is it possible this is a 250V line?

    The outlet looks like this: (I'll try...)


    | |--

    Any ideas what this is?
  5. Chris

    Chris Guest

    I think I drew that outlet wrong in my last post...

    It really looks like this:


    -- |--
  6. Chris

    Chris Guest

  7. Chris

    Chris Guest

    I am truly pathetic...

    In my last message, I posted a link to a picture, but after further
    review, the picture of the outlet doesn't match up 100% with my
    outlet, even though their diagram on the right does.

    This, for sure, is what my outlet looks like:

    My god it took me a long time to get to this point. Jeez.
  8. scada

    scada Guest

    This receptacle does not have a neutral return. You cannot safely convert it
    to 110VAC from the outlet alone. An electrician can rewire the Circuit
    breaker panel by rerouting one wire to the neutral and installing a single
    pole breaker. That is beyond the scope of a first timer, please don't try
    it. I don't know of any "Converter" to use, it would have to be a big
    transformer to run the Air Conditioning. The only thing you could do would
    be to have a licensed Electrician rewire the Breaker Panel. Sorry to be the
    one to give the bad news!
  9. Yukio

    Yukio Guest

    Answer is "If you have to ask, Don't"
    Real solution is , You can't have the Air Conditioner and the Coffee Pot or
    Photo-Copier all on the same breaker (fuse??) The Air Conditioner should be
    on its own breaker or install a heavier line, to a 20 Amp breaker if

  10. That's correct. **** you, earlier posters.
  11. Sorry. Please disregard any further messages of this nature. My girlfriend used
    my account earlier today to post this.
  12. BobGardner

    BobGardner Guest

    There aint no such thing as a free lunch. It would be just your luck to hook up
    to the same half of the 220 that was feeding all the 110 outlets, and the darn
    thing would still go out. The other half is probably feeding the lights.....
    did they go out when the ac went out?
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