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What is L and N

Discussion in 'Electronic Basics' started by John Fields, Feb 25, 2005.

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  1. John Fields

    John Fields Guest

    ---
    From the .pdf,

    "Wires are soldered from the base of the socket to line (L) and
    neutral (N) on the PCB."

    In the US, common 120V mains are obtained from one of the ends and the
    neutral of a center-tapped 240V secondary of a transformer. 'L'
    (line) refers to either of the ends of the transformer, and 'N'
    (neutral) refers to the center tap.

    Sometimes the separate ends of the transformer are referred to as 'L1'
    and 'L2' in order to differentiate between them since they're 180° out
    of phase with each other with respect to the center tap.
     
  2. Chretien

    Chretien Guest

    Sometimes I see on schematics L and N. I dont know that this is. Sometimes I
    see it in relation to pic schematics. I dont use pic and dont really know
    anything about it accept that it is a series of programmable chips often for
    hobbyists.

    Here is an example
    http://eu.st.com/stonline/books/pdf/docs/10130.pdf

    I have no intention of building this but just show it here as an one
    example.

    Regards
     
  3. Chretien

    Chretien Guest

    Thanks All.

    I get it now.

    Another diagram is here.
    http://www.coilws.com/Switch Mode Power/30W_SMPS.htm

    On a 120v AC socket (if the polarity is right), the L is the small rectangle
    hole and the N is the large rectagle hole. Not to be confused with the 3erd
    prong which is ground.(green)

    Regards
     
  4. Jamie

    Jamie Guest

    L = Hot side of your AC line, normally the Black wire.
    N = Neutral, normally the white wire. this wire is the
    one that is connected to ground in the US at some given
    point out side your home, normally on the pole ground and
    your house ground coming in.
    the green wire is normally your own supplied ground around your
    property to insure user and polarity safety.
     
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