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  1. #1
    Join Date
    Oct 2008
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    1

    Default coverting 240v to 120v

    Hi, is there a way to convert a 240vac line so you can run 120vac appliances off of it? Thanks

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: coverting 240v to 120v

    Can you expand on details?
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Aug 2007
    Location
    Denver, CO
    Posts
    666

    Default Re: coverting 240v to 120v

    Yup, need a few details but yes, very possible.

  4. #4
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,808

    Default Re: coverting 240v to 120v

    Yes it is possible, how depends an the type and wiring of the 240v circuit.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  5. #5
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,631

    Default Re: coverting 240v to 120v

    If there's a neutral wire (not just a ground), it's easy. The voltage will be 120V between ONE (either) of the hot wires and the neutral.

    The breaker for the circuit must be properly sized for the SMALLEST wire in the circuit. So if the 240V circuit is a re-used dryer outlet, which is typically 30A, and you are connecting 12 gauge wire to it, you'll either need to replace the 30A breaker with a 20A one, or you'll need to install a sub-panel at the end of the 240V circuit. Example:

    Code:
    [30A 2-pole Breaker]=======Hot=[1-pole 20A Breaker]=12 ga==+
                    |      |                                   |
                    |     120V                          [120V Appliance]
                    |      |                                   |
                   240V  -----Neutral-+--------12 gauge--------+
                    |      |          |
                    |      |          +--------14 gauge--------+
                    |      |                                   |
                    |     120V               [120V Receptacle or lights]
                    |      |                                   |
    [30A 2-pole Breaker]=======Hot=[1-pole 15A Breaker]=14 ga==+
    You didn't hear this from me: it's also 120V between ONE of the hot wires and the ground. But to use the ground as a neutral is not permissible under any electrical code.

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