Transformer lead color

Discussion in 'Electronic Basics' started by Stumpy, Sep 3, 2006.

  1. Stumpy

    Stumpy Guest

    I found a power transformer in my garage which I need to use. Primary wires
    are black. On the other side it has 2 red wires and 2 green wires.

    Is there some standard color code for transformer wire?

    Only ID on case is 710-4235-03 and then 549-7710.

    Have not found a part # reference so I guess trial and error measurements
    are next.
     
    Stumpy, Sep 3, 2006
    #1
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  2. Stumpy

    Stumpy Guest

    If it matters I have 8 ohms accross the black wires, 4 ohms accross the red
    ones, and 0.5 accross the green ones. Infinity accross any non-matching
    colors.
     
    Stumpy, Sep 3, 2006
    #2
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  3. Stumpy

    Ralph Mowery Guest

    "Stumpy" <> wrote in message
    news:19pKg.13849$...
    >I found a power transformer in my garage which I need to use. Primary
    >wires are black. On the other side it has 2 red wires and 2 green wires.
    >
    > Is there some standard color code for transformer wire?
    >
    > Only ID on case is 710-4235-03 and then 549-7710.
    >
    > Have not found a part # reference so I guess trial and error measurements
    > are next.


    Usually the 2 black wires are the primary as you mentioned. The red wires
    are high voltage wires. Could be almost any voltage , most likely from about
    120 to 500 volts. While not on your transformer, if there was a third red
    wire with a stripe on it, it would be the center tap . The green wires are
    often called the filiment winding. Usually 6.3 or 12.6 volts AC if the
    primary is connected to 120 volts.
     
    Ralph Mowery, Sep 3, 2006
    #3
  4. Stumpy wrote:
    > If it matters I have 8 ohms accross the black wires, 4 ohms accross the red
    > ones, and 0.5 accross the green ones. Infinity accross any non-matching
    > colors.
    >
    >

    I would bet a dollar that the black wires are the primary, the red
    wires are a medium voltage output (less than the primary), while the
    green pair are a lower output voltage.
     
    John Popelish, Sep 3, 2006
    #4
  5. "Stumpy" <> wrote in message
    news:19pKg.13849$...

    > I found a power transformer in my garage which I need to use. Primary
    > wires are black. On the other side it has 2 red wires and 2 green wires.


    Connect the black wires to 12 VAC and measure the other voltages.
     
    Homer J Simpson, Sep 3, 2006
    #5
  6. Stumpy

    Stumpy Guest

    > I would bet a dollar that the black wires are the primary, the red wires
    > are a medium voltage output (less than the primary), while the green pair
    > are a lower output voltage.


    Yeah, You'd get the dollar. I hooked it up to house AC and got 23Vac on
    red, and 14Vac on green.

    Soon as I dust off a Variac I've got an adjustable DC power supply.
     
    Stumpy, Sep 3, 2006
    #6
  7. Stumpy

    ehsjr Guest

    Stumpy wrote:
    >>I would bet a dollar that the black wires are the primary, the red wires
    >>are a medium voltage output (less than the primary), while the green pair
    >>are a lower output voltage.

    >
    >
    > Yeah, You'd get the dollar. I hooked it up to house AC and got 23Vac on
    > red, and 14Vac on green.
    >
    > Soon as I dust off a Variac I've got an adjustable DC power supply.
    >
    >


    You might want to consider adding a couple more
    components to it.

    Ed
     
    ehsjr, Sep 3, 2006
    #7
  8. Stumpy

    Stumpy Guest

    >>
    >> Soon as I dust off a Variac I've got an adjustable DC power supply.

    >
    > You might want to consider adding a couple more
    > components to it.
    >


    Of course, I made the bridge rectifier circuit with a 2 capacitor and
    inductor filter, but blew up capacitors when I tried to feed it with a
    dimmer switch. This second go-round is just to incorporate a step-down
    transformer and an autotransformer in place of the dimmer switch. Trying to
    learn from my mistakes.
     
    Stumpy, Sep 3, 2006
    #8
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